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| Intellectual disability syndromic and non-syndromic v1.62 | ARHGEF40 |
Chirag Patel gene: ARHGEF40 was added gene: ARHGEF40 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: ARHGEF40 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: ARHGEF40 were set to PMID: 39838643 Phenotypes for gene: ARHGEF40 were set to Neurodevelopmental disorder MONDO:0700092 Review for gene: ARHGEF40 was set to RED Added comment: 2 individuals with global developmental delay, hypotonia, short stature, hearing impairment, nystagmus, feeding issues, and dysmorphism (bifid uvula, narrow mouth, high palate, micrognathia). Trio clinical whole exome sequencing identified de novo variants in the ARHGEF40 gene at position p.Arg225, which is fully conserved in mammals and located within the n-terminal keratin binding region (p.Arg225Trp and p.Arg225Gln). Of note, multiple additional probands with rare missense variants at the p.Arg225 residue have been identified by the same laboratory (but there was no consent for publication, providing further evidence of the importance of this residue. The ARHGEF40 gene (aka SOLO) is a member of the Rho guanine nucleotide exchange factor (Rho-GEF) family of proteins, which stimulate Rho signal transduction molecules by converting them from inactive GDP-bound form to the active GTP-bound state. No functional studies to characterise disease-gene relationship or disease mechanism. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v1.59 | HECTD1 |
Chirag Patel gene: HECTD1 was added gene: HECTD1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: HECTD1 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: HECTD1 were set to PMID: 39879987 Phenotypes for gene: HECTD1 were set to Neurodevelopmental disorder MONDO:0700092 Review for gene: HECTD1 was set to GREEN Added comment: 14 unrelated individuals (identified through GeneMatcher) with 15 variants of uncertain significance (VUS) in HECTD1 (10 missense, 3 frameshift, 1 nonsense, and 1 splicing variant). Of the 15 different variants in HECTD1, 10 occurred de novo, 3 had unknown inheritance, and 2 were compound heterozygous. All variants were absent in gnomAD, and HECTD1 is highly intolerant to loss-of-function variation (loss-of-function-intolerant score of 1). Clinical presentation was variable developmental delay, intellectual disability, autism spectrum disorder, ADHD, and epilepsy. The one individual with compound heterozygous variants had growth impairment along with NDD. The variants were inherited from apparently healthy parents, suggesting that genetic or environmental modifiers may be required to develop the phenotype. Significant enrichment of de novo variants in HECTD1 was also shown in an independent cohort of 53,305 published trios with NDDs or congenital heart disease. HECT-domain-containing protein 1 (HECTD1) mediates developmental pathways, including cell signalling, gene expression, and embryogenesis. Conditional knockout of Hectd1 in the neural lineage in mice resulted in microcephaly, severe hippocampal malformations, and complete agenesis of the corpus callosum, supporting a role for Hectd1 in embryonic brain development. Functional studies of 2 missense variants and 1 nonsense variant in C. elegans revealed dominant effects, including either change-of-function or loss-of-function/haploinsufficient mechanisms. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v1.33 | LRRC8C |
Sangavi Sivagnanasundram gene: LRRC8C was added gene: LRRC8C was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: LRRC8C was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: LRRC8C were set to 39623139 Phenotypes for gene: LRRC8C were set to TIMES syndrome MIM#621056 Mode of pathogenicity for gene: LRRC8C was set to Other Review for gene: LRRC8C was set to AMBER Added comment: TIMES syndrome is a multisystem disorder characterised by considerable phenotypic variability, but overlapping features include telangiectasia, impaired intellectual development, microcephaly, metaphyseal dysplasia, eye abnormalities, and short stature. Patients exhibit striking cutis marmorata in infancy. Two individuals from unrelated families presenting with similar features consistent with TIMES syndrome. Leu400IlefsTer8 and Val390Leu variants were identified however the proposed mechanism of disease is GoF. Supporting in vitro functional assay was conducted however further evidence is required to upgrade the gene classification. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v1.28 | ZNF711 | Zornitza Stark reviewed gene: ZNF711: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Intellectual developmental disorder, X-linked 97, MIM# 300803; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v1.19 | CAPZA2 | Chris Ciotta reviewed gene: CAPZA2: Rating: GREEN; Mode of pathogenicity: None; Publications: 32338762, 38374166, 35856264; Phenotypes: Neurodevelopmental disorder, MONDO:0700092, CAPZA2-related; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6909 | FMR1 | Zornitza Stark Mode of inheritance for gene: FMR1 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6880 | OPA3 | Zornitza Stark Mode of inheritance for gene: OPA3 was changed from BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal to BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6879 | OPA3 | Zornitza Stark Mode of inheritance for gene: OPA3 was changed from Unknown to BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6839 | LAMP2 | Zornitza Stark Mode of inheritance for gene: LAMP2 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6819 | IKBKG | Zornitza Stark Mode of inheritance for gene: IKBKG was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6805 | IDS | Zornitza Stark Mode of inheritance for gene: IDS was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6790 | HSD17B10 | Zornitza Stark Mode of inheritance for gene: HSD17B10 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6787 | HPRT1 | Zornitza Stark Mode of inheritance for gene: HPRT1 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6753 | HEPACAM | Zornitza Stark Mode of inheritance for gene: HEPACAM was changed from Unknown to BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6750 | HCCS | Zornitza Stark Mode of inheritance for gene: HCCS was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6749 | HCCS | Zornitza Stark reviewed gene: HCCS: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: linear skin defects with multiple congenital anomalies 1 (MONDO:0024552); Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6741 | GPC3 | Zornitza Stark Mode of inheritance for gene: GPC3 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6719 | PRPS1 | Ain Roesley Mode of inheritance for gene: PRPS1 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6718 | PRPS1 | Ain Roesley reviewed gene: PRPS1: Rating: GREEN; Mode of pathogenicity: None; Publications: 24961627; Phenotypes: PRPS1 deficiency disorder MONDO:0100061; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males); Current diagnostic: yes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6711 | FTSJ1 | Zornitza Stark Mode of inheritance for gene: FTSJ1 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6687 | PEX7 | Ain Roesley Phenotypes for gene: PEX7 were changed from Peroxisome biogenesis disorder 9B MIM#614879; Rhizomelic chondrodysplasia punctata, type 1 MIM#215100 to Peroxisome biogenesis disorder 9B MIM#614879; Rhizomelic chondrodysplasia punctata, type 1 MIM#215100 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6686 | PEX7 | Ain Roesley Phenotypes for gene: PEX7 were changed from to Peroxisome biogenesis disorder 9B MIM#614879; Rhizomelic chondrodysplasia punctata, type 1 MIM#215100 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6685 | PEX7 | Ain Roesley reviewed gene: PEX7: Rating: GREEN; Mode of pathogenicity: None; Publications: 20301447; Phenotypes: Peroxisome biogenesis disorder 9B MIM#614879, Rhizomelic chondrodysplasia punctata, type 1 MIM#215100; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal; Current diagnostic: yes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6683 | PEX6 | Ain Roesley edited their review of gene: PEX6: Changed mode of inheritance: BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6671 | PEX14 | Ain Roesley Mode of inheritance for gene: PEX14 was changed from Unknown to BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6670 | PEX14 | Ain Roesley reviewed gene: PEX14: Rating: GREEN; Mode of pathogenicity: None; Publications: 37493040, 20301621; Phenotypes: Peroxisome biogenesis disorder 13A (Zellweger) MIM#614887, peroxisome biogenesis disorder due to PEX14 defect MONDO:0100268; Mode of inheritance: BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal; Current diagnostic: yes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6665 | TSHZ3 |
Bryony Thompson gene: TSHZ3 was added gene: TSHZ3 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: TSHZ3 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: TSHZ3 were set to 27668656; 34919690; 36553458; 39420202 Phenotypes for gene: TSHZ3 were set to congenital anomaly of kidney and urinary tract MONDO:0019719 Review for gene: TSHZ3 was set to AMBER Added comment: More evidence for the gene-disease association is required PMID: 27668656 - TSHZ3 is included in the region deleted in chromosome 19q13.11 Deletion Syndrome, which includes intellectual disability and behavioural issues, congenital anomalies of the kidney and urinary tract (CAKUT) PMID: 34919690 - haploinsufficient mouse model leads to kidney defects PMID: 36553458 - heterozygous frameshift variant c.119_120dup p.Pro41SerfsTer79 in a case with intellectual disability, behavioural issues, pyelocaliceal dilatation, and mild urethral stenosis. PMID: 39420202 - 12 CAKUT patients from 9/301 (3%) families carried 5 different rare heterozygous TSHZ3 missense variants. However, 1 of the variants (p.Ser58Gly) present in 5 of the families is more common in gnomAD v4.1 than you would expect for a dominant disease including 5 homozygotes (1,408/1,612,114 alleles, 5 hom, AF=0.0008734). The authors state this is not unexpected in a condition, such as CAKUT. However, the different missense variants are inherited from unaffected parents in at least 2/9 families (there was no phenotype information available for an additional 3 parents). Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.6652 | MRPL49 |
Zornitza Stark gene: MRPL49 was added gene: MRPL49 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: MRPL49 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: MRPL49 were set to 39417135 Phenotypes for gene: MRPL49 were set to Mitochondrial disease, MONDO:0044970, MRPL49-related Review for gene: MRPL49 was set to GREEN Added comment: Five unrelated families with presentations ranging from Perrault syndrome (primary ovarian insufficiency and sensorineural hearing loss) to severe childhood onset of leukodystrophy, learning disability, microcephaly and retinal dystrophy and bi-allelic variants in this gene. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.6635 | PDHA1 | Ain Roesley Mode of inheritance for gene: PDHA1 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6634 | PDHA1 | Ain Roesley reviewed gene: PDHA1: Rating: GREEN; Mode of pathogenicity: None; Publications: 23021068; Phenotypes: Pyruvate dehydrogenase E1-alpha deficiency MIM#312170; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males); Current diagnostic: yes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6608 | SLC6A19 | Zornitza Stark commented on gene: SLC6A19: Well established gene-disease association with several neurological manifestations, including DD. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6602 | SLC35A2 | Zornitza Stark Mode of inheritance for gene: SLC35A2 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6601 | SLC35A2 | Zornitza Stark reviewed gene: SLC35A2: Rating: GREEN; Mode of pathogenicity: None; Publications: 23561849, 24115232, 27743886, 25778940, 33407896; Phenotypes: Congenital disorder of glycosylation, type IIm (MIM #300896) 30817854, Mild malformation of cortical development with oligodendroglial hyperplasia in epilepsy (MOGHE); Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6596 | SLC2A1 | Zornitza Stark Mode of inheritance for gene: SLC2A1 was changed from Unknown to BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6595 | SLC2A1 | Zornitza Stark reviewed gene: SLC2A1: Rating: GREEN; Mode of pathogenicity: None; Publications: 32913944; Phenotypes: GLUT1-deficiency syndrome, MONDO:0000188, Dystonia 9 601042, GLUT1 deficiency syndrome 1, infantile onset, severe 606777, GLUT1 deficiency syndrome 2, childhood onset 612126, Stomatin-deficient cryohydrocytosis with neurologic defects 608885; Mode of inheritance: BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6531 | KDM6A | Zornitza Stark Mode of inheritance for gene: KDM6A was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6528 | KDM6A | Sangavi Sivagnanasundram reviewed gene: KDM6A: Rating: GREEN; Mode of pathogenicity: None; Publications: 33674768; Phenotypes: Kabuki syndrome 2 MONDO:0010465; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6508 | GK | Bryony Thompson Mode of inheritance for gene: GK was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6507 | GK | Bryony Thompson reviewed gene: GK: Rating: GREEN; Mode of pathogenicity: None; Publications: 37091526, 33212314; Phenotypes: inborn glycerol kinase deficiency MONDO:0010613, X-linked adrenal hypoplasia congenita MONDO:0010264; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6488 | RPS6KA3 | Zornitza Stark Mode of inheritance for gene: RPS6KA3 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6487 | RPS6KA3 | Zornitza Stark reviewed gene: RPS6KA3: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Coffin-Lowry syndrome MIM# 303600; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6334 | NDUFA1 | Zornitza Stark Mode of inheritance for gene: NDUFA1 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6304 | NDUFA1 | Chirag Patel reviewed gene: NDUFA1: Rating: GREEN; Mode of pathogenicity: None; Publications: PMID: 29506883, 19185523, 17262856, 21596602; Phenotypes: Mitochondrial complex I deficiency, nuclear type 12 MIM#301020; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6295 | GAMT | Bryony Thompson Phenotypes for gene: GAMT were changed from to guanidinoacetate methyltransferase deficiency MONDO:0012999 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6292 | GAMT | Bryony Thompson reviewed gene: GAMT: Rating: GREEN; Mode of pathogenicity: None; Publications: 20301745; Phenotypes: guanidinoacetate methyltransferase deficiency MONDO:0012999; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal; Current diagnostic: yes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6249 | IKBKG | Sangavi Sivagnanasundram reviewed gene: IKBKG: Rating: GREEN; Mode of pathogenicity: None; Publications: 20301645; Phenotypes: Incontinentia pigmenti MONDO:0010631; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6248 | NPHP1 | Chirag Patel reviewed gene: NPHP1: Rating: GREEN; Mode of pathogenicity: None; Publications: PMID: 15138899, 32139166, 28347285, 8852662, 9856524; Phenotypes: Joubert syndrome 4, MIM# 609583, Nephronophthisis 1, juvenile, MIM# 256100, Senior-Loken syndrome-1, MIM# 266900; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6248 | OPA3 | Chirag Patel reviewed gene: OPA3: Rating: GREEN; Mode of pathogenicity: None; Publications: PMID: 25159689, 31119193, 31928268; Phenotypes: 3-methylglutaconic aciduria, type III (MGA3) (MIM#258501), AR, Optic atrophy 3 with cataract (MIM#165300), AD; Mode of inheritance: BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6222 | EP300 |
Ken Lee Wan changed review comment from: EP300 is definitively associated with autosomal dominant Rubinstein-Taybi syndrome. Rubinstein-Taybi syndrome is characterized by distinctive facial features, broad and angulated thumbs and halluces, short stature, and intellectual disability (https://search.clinicalgenome.org/CCID:004751). Mechanism of disease: loss of function; to: EP300 is definitively associated with autosomal dominant Rubinstein-Taybi syndrome. Rubinstein-Taybi syndrome is characterized by distinctive facial features, broad and angulated thumbs and halluces, short stature and intellectual disability (https://search.clinicalgenome.org/CCID:004751). Mechanism of disease: loss of function |
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| Intellectual disability syndromic and non-syndromic v0.6222 | IDH2 | Sangavi Sivagnanasundram reviewed gene: IDH2: Rating: GREEN; Mode of pathogenicity: None; Publications: 20847235, 35359529; Phenotypes: mitochondrial disease MONDO:0044970; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6222 | HSD17B10 | Sangavi Sivagnanasundram reviewed gene: HSD17B10: Rating: GREEN; Mode of pathogenicity: None; Publications: 22132097, 17618155; Phenotypes: HSD10 mitochondrial disease MONDO:0010327; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6222 | HEPACAM | Sangavi Sivagnanasundram reviewed gene: HEPACAM: Rating: GREEN; Mode of pathogenicity: None; Publications: 21419380, 24202401, 27389245, 31372844, 21419380, 24202401, 27322623; Phenotypes: Megalencephalic leukoencephalopathy with subcortical cysts 2A MONDO:0013490, Megalencephalic leukoencephalopathy with subcortical cysts 2B, remitting, with or without intellectual disability MONDO:0013491; Mode of inheritance: BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6222 | HCCS | Sangavi Sivagnanasundram reviewed gene: HCCS: Rating: AMBER; Mode of pathogenicity: None; Publications: 18950397; Phenotypes: linear skin defects with multiple congenital anomalies 1 (MONDO:0024552); Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6217 | DYNC1H1 |
Ken Lee Wan changed review comment from: DYNC1H1 is definitively associated with autosomal dominant dyneinopathy. A spectrum of diseases related to monoallelic variants in DYNC1H1 and characterized by variable neuromuscular and/or neurodevelopmental presentations. DYNC1H1 have been reported with a predominantly neuromuscular presentation, including congenital myopathy, spinal muscular atrophy, Charcot-Marie-Tooth (CMT) and less frequently, intellectual disability and autism. (https://search.clinicalgenome.org/CCID:004713) (http://purl.obolibrary.org/obo/MONDO_1040031) (OMIM: 600112); to: DYNC1H1 is definitively associated with autosomal dominant dyneinopathy. A spectrum of diseases related to monoallelic variants in DYNC1H1 and characterized by variable neuromuscular and/or neurodevelopmental presentations. DYNC1H1 have been reported with a predominantly neuromuscular presentation, including congenital myopathy, spinal muscular atrophy, Charcot-Marie-Tooth (CMT) and less frequently, intellectual disability and autism. Mechanism of disease: gain of function (https://search.clinicalgenome.org/CCID:004713) (http://purl.obolibrary.org/obo/MONDO_1040031) (OMIM: 600112) |
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| Intellectual disability syndromic and non-syndromic v0.6215 | DIAPH1 |
Ken Lee Wan changed review comment from: Seizures, cortical blindness, and microcephaly syndrome (SCBMS) is an autosomal recessive neurodevelopmental disorder characterized by microcephaly, early-onset seizures, severely delayed psychomotor development, and cortical blindness. Affected individuals also tend to show poor overall growth with short stature (MIM: 616632). Biallelic loss-of-function DIAPH1 variants have been reported in 3 Middle Eastern consanguineous families with a unique syndrome of early onset seizures, progressive microcephaly, intellectual disability and severe visual impairment (PMIDs: 24781755; 26463574). Western blot analysis showed lack of the mDia1 protein for affected individuals (PMID: 24781755).; to: Seizures, cortical blindness, and microcephaly syndrome (SCBMS) is an autosomal recessive neurodevelopmental disorder characterized by microcephaly, early-onset seizures, severely delayed psychomotor development and cortical blindness. Affected individuals also tend to show poor overall growth with short stature (MIM: 616632). Biallelic loss-of-function DIAPH1 variants have been reported in 3 Middle Eastern consanguineous families with a unique syndrome of early onset seizures, progressive microcephaly, intellectual disability and severe visual impairment (PMIDs: 24781755; 26463574). Western blot analysis showed lack of the mDia1 protein for affected individuals (PMID: 24781755). |
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| Intellectual disability syndromic and non-syndromic v0.6214 | DYNC1H1 |
Ken Lee Wan changed review comment from: DYNC1H1 is definitively associated with autosomal dominant dyneinopathy. A spectrum of diseases related to monoallelic variants in DYNC1H1 and characterized by variable neuromuscular and/or neurodevelopmental presentations. DYNC1H1 have been reported with a predominantly neuromuscular presentation, including congenital myopathy, spinal muscular atrophy, Charcot-Marie-Tooth (CMT), and less frequently, intellectual disability and autism. (https://search.clinicalgenome.org/CCID:004713) (http://purl.obolibrary.org/obo/MONDO_1040031) (OMIM: 600112); to: DYNC1H1 is definitively associated with autosomal dominant dyneinopathy. A spectrum of diseases related to monoallelic variants in DYNC1H1 and characterized by variable neuromuscular and/or neurodevelopmental presentations. DYNC1H1 have been reported with a predominantly neuromuscular presentation, including congenital myopathy, spinal muscular atrophy, Charcot-Marie-Tooth (CMT) and less frequently, intellectual disability and autism. (https://search.clinicalgenome.org/CCID:004713) (http://purl.obolibrary.org/obo/MONDO_1040031) (OMIM: 600112) |
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| Intellectual disability syndromic and non-syndromic v0.6214 | DYNC1H1 |
Ken Lee Wan changed review comment from: DYNC1H1 is definitively associated with autosomal dominant dyneinopathy. A spectrum of diseases related to monoallelic variants in DYNC1H1 and characterized by variable neuromuscular and/or neurodevelopmental presentations. DYNC1H1 have been reported with a predominantly neuromuscular presentation, including congenital myopathy, spinal muscular atrophy, Charcot-Marie-Tooth (CMT), and less frequently, intellectual disability and autism. (https://search.clinicalgenome.org/CCID:004713) (http://purl.obolibrary.org/obo/MONDO_1040031) (OMIM#600112); to: DYNC1H1 is definitively associated with autosomal dominant dyneinopathy. A spectrum of diseases related to monoallelic variants in DYNC1H1 and characterized by variable neuromuscular and/or neurodevelopmental presentations. DYNC1H1 have been reported with a predominantly neuromuscular presentation, including congenital myopathy, spinal muscular atrophy, Charcot-Marie-Tooth (CMT), and less frequently, intellectual disability and autism. (https://search.clinicalgenome.org/CCID:004713) (http://purl.obolibrary.org/obo/MONDO_1040031) (OMIM: 600112) |
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| Intellectual disability syndromic and non-syndromic v0.6195 | CEP76 |
Mark Cleghorn gene: CEP76 was added gene: CEP76 was added to Intellectual disability syndromic and non-syndromic. Sources: Other Mode of inheritance for gene: CEP76 was set to BIALLELIC, autosomal or pseudoautosomal Phenotypes for gene: CEP76 were set to complex neurodevelopmental disorder MONDO:0100038; Joubert syndrome; Bardet-Biedl syndrome; retinitis pigmentosa Penetrance for gene: CEP76 were set to unknown Review for gene: CEP76 was set to GREEN Added comment: Erica Davis, Stanley Manne Children’s research institute, Chicago ESHG presentation 4/6/24, unpublished CEP76 associated with syndromic ciliopathy CEP76 localizes to centrioles and basal body primary cilia Role in normal centriolar duplication Index case Bardet Biedl syndrome Compound heterozygous pLoF variants in CEP76 Via Gene matcher 7 cases in 7 families- biallelic CEP76 and various clinical features within ciliopathy spectrum: Obesity Ocular phenotype Structural brain anomalies Renal? 3/7 families clinical Dx Joubert syndrome 1/7 BBS 1/7 GDD/ID NOS 2/7 retinitis pigmentosa (1 of these with learning difficulties) Mixture of biallelic pLOF and missense variant CEP76 knockout zebrafish model shows retinal phenotype w photoreceptor loss, similar to homozygous known BBS4 pathogenic variant Cell based fx studies with missense variants above, consistent with centriolar duplication dysfunction Sources: Other |
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| Intellectual disability syndromic and non-syndromic v0.6195 | EIF3I |
Mark Cleghorn gene: EIF3I was added gene: EIF3I was added to Intellectual disability syndromic and non-syndromic. Sources: Other Mode of inheritance for gene: EIF3I was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Phenotypes for gene: EIF3I were set to complex neurodevelopmental disorder MONDO:0100038 Penetrance for gene: EIF3I were set to unknown Review for gene: EIF3I was set to AMBER Added comment: Marcello Scala, Genoa ESHG presentation 4/6/24, unpublished De novo EIF3I missense variants as a cause for novel NDD syndrome EIF3 complex involved in regulating initiation of mRNA translation Negative regulator of the TGF beta pathway 8 individuals from 8 families Mod/severe GDD or ID Short stature Midline brain anomalies (hypoplasia/agenesis of corpus callosum and pituitary hypoplasia) Frontal bossing, hypertelorism, long philtrum All w rare de novo missense variants om EIF3I, clustering within highly conserved WD repeats Functional studies Transfected HEK293 cell studies suggested EIF3I protein from variant alleles (from patients above) had disrupted interaction with other EIF subunits, and cells had reduced protein synthesis overall No animal models Sources: Other |
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| Intellectual disability syndromic and non-syndromic v0.6189 | FKBP4 |
Mark Cleghorn gene: FKBP4 was added gene: FKBP4 was added to Intellectual disability syndromic and non-syndromic. Sources: Other Mode of inheritance for gene: FKBP4 was set to BIALLELIC, autosomal or pseudoautosomal Phenotypes for gene: FKBP4 were set to complex neurodevelopmental disorder MONDO:0100038 Penetrance for gene: FKBP4 were set to unknown Review for gene: FKBP4 was set to AMBER Added comment: Rebecca Yarwood, University of Manchester ESHG presentation 4/6/24, unpublished Bilalleic FKBP4 w NDD + DSD Protein has functions in hormone receptor trafficking FKPB4 highly expressed in stem cell and progenitor cells in gonad and neuronal degeneration Index case Severe GDD abN external genitalia CV AbN FBBP4 p.E196* Via GeneMatcher 7 families (12 individuals) 12/12 severe GDD/ID 9/10 microcephaly 11/12 external genital abnormalities (details not provided) All w homozygous pLoF variants (mixture of canonical splice, frameshift, nonsense) Sources: Other |
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| Intellectual disability syndromic and non-syndromic v0.6188 | MED16 |
Mark Cleghorn gene: MED16 was added gene: MED16 was added to Intellectual disability syndromic and non-syndromic. Sources: Other Mode of inheritance for gene: MED16 was set to BIALLELIC, autosomal or pseudoautosomal Phenotypes for gene: MED16 were set to complex neurodevelopmental disorder MONDO:0100038 Penetrance for gene: MED16 were set to unknown Review for gene: MED16 was set to GREEN Added comment: MED16 Charlotte Guillouet, Imagine institute Paris ESHG presentation 4/6/24, unpublished MED16 is part of tail of ‘mediator complex’ Plays a role in enhancer/promotor regions Disruptive variants in other genes encoding proteins within this mediator complex (MED11/12/12/17/20, CDK8) are assoc w neurodevelopmental/neurodegenerative disorders Cases index family Sibs (M/F) to consanguineous parents w NDD/mod ID, tetralogy of Fallot or VSD, bilat deafness, micrognathia, malar hypoplasia, dental AbN, pre auricular tags, hypoplastic nails, brachydactly WES: biallelic MED16 p.Asp217Asn Via genematcher 16 families total, 22 individuals, homozygous or compound het rare MED16 variants Mixture of pLoF and missense variants Motor delay in 16/17 DD or ID in 17/17 Speech delay in 15/15 6/19 ToF 7/19 other septal/aortic defects 6/18 deafness 11/18 microretognathia 6/17 cleft palate 8/19 preauricular tags 9/20 puffy eyelids 12/20 nasal dysplasia (most commonly short columella w bulbous nasal tip) 7/20 corpus callosum anomalies Not clear that functional work recapitulated phenotype as yet? Immunofluroescence on HeLa cells transfected with variants observed ?conclusion MED16 knockout mouse > growth delay, pre weaning lethality MED16 knockout zebrafish > reduced body length, early death, no obvious craniofacial phenotype Sources: Other |
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| Intellectual disability syndromic and non-syndromic v0.6188 | LAMP2 | Chirag Patel reviewed gene: LAMP2: Rating: GREEN; Mode of pathogenicity: None; Publications: PubMed: 10972294; Phenotypes: Danon disease, MIM# 300257, MONDO:0010281; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males); Current diagnostic: yes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6180 | SLC6A8 | Zornitza Stark Mode of inheritance for gene: SLC6A8 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6179 | SLC6A8 | Zornitza Stark reviewed gene: SLC6A8: Rating: GREEN; Mode of pathogenicity: None; Publications: 27604308, 16738945; Phenotypes: Cerebral creatine deficiency syndrome 1, MIM# 300352; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6144 | DCX | Zornitza Stark Mode of inheritance for gene: DCX was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6143 | DARS2 | Zornitza Stark Phenotypes for gene: DARS2 were changed from to Leukoencephalopathy with brain stem and spinal cord involvement and lactate elevation, MIM# 611105 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6127 | RFC4 |
Chirag Patel gene: RFC4 was added gene: RFC4 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: RFC4 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: RFC4 were set to PMID: 39106866 Phenotypes for gene: RFC4 were set to RFC4-related multisystem disorder Review for gene: RFC4 was set to GREEN gene: RFC4 was marked as current diagnostic Added comment: 9 affected individuals (aged birth to 47yrs) from 8 unrelated families with a multisystem disorder. Clinical features included: muscle weakness/myopathy (9/9), motor incoordination/gait disturbance (8/8), delayed gross motor development (6/9), dysarthria (5/5), peripheral neuropathy (3/3 adults), bilateral sensorineural hearing impairment (6/9), decreased body weight (8/9), short stature (5/9), microcephaly (4/9), respiratory issues/insufficiency (6/9), cerebellar atrophy (4/9), pituitary hypoplasia (3/9). WES or WGS identified biallelic loss-of-function variants in RFC4 (3 frameshift, 2 splice site, 1 single AA duplication, 2 single AA deletions, 2 missense), and almost all are likely to disrupt the C-terminal domain indispensable for Replication factor C (RFC) complex formation. All variants segregated with the disease. The RFC complex (with 5 subunits) is central to process of regulation of DNA replication, and it loads proliferating cell nuclear antigen onto DNA to facilitate the recruitment of replication and repair proteins and enhance DNA polymerase processivity. RFC1 is associated with CANVAS but the contributions of RFC2-5 subunits on human Mendelian disorders is unknown. Analysis of a previously determined cryo-EM structure of RFC bound to proliferating cell nuclear antigen suggested that the variants disrupt interactions within RFC4 and/or destabilize the RFC complex. Cellular studies using RFC4-deficient HeLa cells and primary fibroblasts demonstrated decreased RFC4 protein, compromised stability of the other RFC complex subunits, and perturbed RFC complex formation. Additionally, functional studies of the RFC4 variants affirmed diminished RFC complex formation, and cell cycle studies suggested perturbation of DNA replication and cell cycle progression. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.6123 | C12orf66 |
Mark Cleghorn gene: C12orf66 was added gene: C12orf66 was added to Intellectual disability syndromic and non-syndromic. Sources: Other Mode of inheritance for gene: C12orf66 was set to BIALLELIC, autosomal or pseudoautosomal Phenotypes for gene: C12orf66 were set to complex neurodevelopmental disorder MONDO:0100038 Penetrance for gene: C12orf66 were set to unknown Review for gene: C12orf66 was set to AMBER Added comment: KICS2 (previously known as C12ORF66) Rebecca Buchert, Universitatklinikum Tubingen ESHG talk 2/6/24, unpublished Proposed ID + epilepsy gene 8 families w 11 affected individuals Phenotypes: 11/11 ID, 9/11 epilepsy, 3/11 hearing impairment 3/8 homozygous missense variants (p.Asp296Glu, p.Tyr393Cys, p.Tyr393Cys), all highly conserved 1/8 compound het PTC (p.Lys262*) with 1.1Mb deletion 4/8 homozygous PTC (p.Glu3*, p.Gly79Valfs*18, p.Gly79Valfs*18, p.Lys260Asnfs*18) Gene appears to be involved in mTOR pathway, and cilia function mTORC1 activity in CRISPR-HEK293T cells – reduced activity in cells w variants above Zebrafish model: otolith defects, ciliary dysfunction ?not clear if truly mimics phenotype observed in patient cohort described Sources: Other |
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| Intellectual disability syndromic and non-syndromic v0.6123 | REPS2 |
Mark Cleghorn gene: REPS2 was added gene: REPS2 was added to Intellectual disability syndromic and non-syndromic. Sources: Other Mode of inheritance for gene: REPS2 was set to X-LINKED: hemizygous mutation in males, biallelic mutations in females Phenotypes for gene: REPS2 were set to complex neurodevelopmental disorder MONDO:0100038; Cerebral palsy HP:0100021 Penetrance for gene: REPS2 were set to unknown Review for gene: REPS2 was set to AMBER Added comment: REPS2 Hao Hu, Guangzhou Women and Children’s MC ESHG talk 1/6/24, unpublished Proposed X-linked cerebral palsy + NDD gene 4 unrelated males with predicted deleterious hemizygous REPS2 variants, 2 PTC, 2 missense. 2 de novo, 2 maternally inherited Phenotypes: 2 w CP + moderate ID/ASD, 2 w NDD NOS Variants described: c.1050_1052delGAA;p.K351del c.1040T>C; p.I347T c.962C>G; p.S321C c.1736delA; p.N579Tfs*17 In vitro assay of above 4 variants suggest reduced REPS2 protein stability Zebrafish model: REPS2 expressed in neuronal cells, REPS2 knock down have reduced motor activity and abN neuronal morphology Mouse model hemizygous w one of above variants (not specified): reduced performance in cognitive tasks, abnormal neuronal migration pattern on post mortem examination Mechanism may relate to dopamine signalling? Sources: Other |
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| Intellectual disability syndromic and non-syndromic v0.6123 | DARS2 | Sumudu Perera reviewed gene: DARS2: Rating: GREEN; Mode of pathogenicity: None; Publications: 17384640, 21815884, 20506600; Phenotypes: Leukoencephalopathy with brain stem and spinal cord involvement and lactate elevation, MIM# 611105; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6123 | DCX |
Sumudu Perera changed review comment from: Pathology: PMID: 26743950 - DCX mutations usually cause anterior dominant lissencephaly in males and subcortical band heterotopia (SBH) in females Phenotype: Demelas et al. (2001) (PMID:11468322) demonstrated three brothers with phenotype of microcephaly, mild to moderate developmental delay, seizures and other neurologic abnormalities, as well as classic lissencephaly on MRI. Lawrence et al. (2010) (PMID: 20726879) discuss 3 male members had severe epilepsy and intellectual disability; finding of missense mutation in DCX. Of note all 3 had been diagnosed with Lennox-Gastaut syndrome. GeneReviews (PMID: 20301364): "Males with classic DCX-related lissencephaly typically have early and profound cognitive and language impairment, cerebral palsy, and epileptic seizures. The clinical phenotype in females with SBH varies widely with cognitive abilities that range from average or mild cognitive impairment to severe intellectual disability and language impairment." Other papers: 1) Somatic mosaicism and variable penetrance - PMID: 12552055 2) Functional testing: PMID: 9489699; to: Pathology: PMID: 26743950 - DCX mutations usually cause anterior dominant lissencephaly in males and subcortical band heterotopia (SBH) in females Phenotype: Demelas et al. (2001) (PMID:11468322) demonstrated three brothers with phenotype of microcephaly, mild to moderate developmental delay, seizures and other neurologic abnormalities, as well as classic lissencephaly on MRI. Lawrence et al. (2010) (PMID: 20726879) discuss 3 male members had severe epilepsy and intellectual disability; finding of missense mutation in DCX. Of note all 3 had been diagnosed with Lennox-Gastaut syndrome. GeneReviews (PMID: 20301364): "Males with classic DCX-related lissencephaly typically have early and profound cognitive and language impairment, cerebral palsy, and epileptic seizures. The clinical phenotype in females with SBH varies widely with cognitive abilities that range from average or mild cognitive impairment to severe intellectual disability and language impairment." Other papers: 1) Somatic mosaicism and variable penetrance - PMID: 12552055 2) Functional testing: PMID: 9489699 |
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| Intellectual disability syndromic and non-syndromic v0.6123 | DCX | Sumudu Perera reviewed gene: DCX: Rating: ; Mode of pathogenicity: None; Publications: 26743950, 11468322, 20726879, 20301364, 12552055, 9489699; Phenotypes: Lissencephaly, X-linked, MIM# 300067, Subcortical laminal heterotopia, X-linked 300067; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6068 | SRPK3 |
Zornitza Stark gene: SRPK3 was added gene: SRPK3 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: SRPK3 was set to X-LINKED: hemizygous mutation in males, biallelic mutations in females Publications for gene: SRPK3 were set to 38429495; 39073169 Phenotypes for gene: SRPK3 were set to Neurodevelopmental disorder, MONDO:0700092, SRPK3-related Review for gene: SRPK3 was set to GREEN Added comment: PMID 39073169: 9 individuals from 5 unrelated families reported with 4 missense and 1 putative truncating variant and a neurodevelopmental phenotype. The 8 patients ascertained postnatally shared common clinical features including intellectual disability, agenesis of the corpus callosum, abnormal eye movement, and ataxia. A ninth case, ascertained prenatally, had a complex structural brain phenotype. Supportive animal model data (mouse and zebrafish). Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.6066 | RBBP5 |
Ain Roesley gene: RBBP5 was added gene: RBBP5 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: RBBP5 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: RBBP5 were set to 39036895 Review for gene: RBBP5 was set to GREEN gene: RBBP5 was marked as current diagnostic Added comment: 5x Indivs (4x de novo) = 3x PTCs + 2x missense 4/5 dev delay/ID 2/5 short stature (<=-3 SD) + 2/5 <= -2 SD 1/5 microcephaly (<= -3 SD) + 3/5 <= -2 SD 2/5 SNHL 2/5 seizures 3/5 hypotonia Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.6051 | PSMF1 |
Zornitza Stark gene: PSMF1 was added gene: PSMF1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: PSMF1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: PSMF1 were set to https://www.medrxiv.org/content/10.1101/2024.06.19.24308302v1 Phenotypes for gene: PSMF1 were set to Complex neurodevelopmental disorder with motor features, MONDO:0100516, PSMF1-related Review for gene: PSMF1 was set to GREEN Added comment: 22 individuals from 15 families reported with a range of neurological phenotypes ranging from early-onset Parkinson's disease; childhood conditions typified by ID and a range of movement disorders; through to perinatal lethal presentations with arthrogryposis multiplex. Genotype-phenotype correlation: biallelic missense variants resulted in the milder phenotypes, while bi-allelic LoF variants in the more severe phenotypes. Supportive functional data. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.6040 | AFF2 | Zornitza Stark Mode of inheritance for gene: AFF2 was changed from X-LINKED: hemizygous mutation in males, biallelic mutations in females to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6039 | AFF2 | Zornitza Stark Mode of inheritance for gene: AFF2 was changed from MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6038 | AFF2 | Zornitza Stark edited their review of gene: AFF2: Changed phenotypes: Intellectual disability, X-linked, FRAXE type 309548; Changed mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6027 | KCND1 |
Ain Roesley gene: KCND1 was added gene: KCND1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: KCND1 was set to X-LINKED: hemizygous mutation in males, biallelic mutations in females Publications for gene: KCND1 were set to 38772379 Phenotypes for gene: KCND1 were set to neurodevelopmental disorder MONDO:0700092, KCND1-related Review for gene: KCND1 was set to GREEN gene: KCND1 was marked as current diagnostic Added comment: 18 males from 17 families 2x de novo missense + 3x maternal NMDs + 12x maternal missense Some functional studies were done 14x ID 4x delayed motor dev 7x muscular hypotonia 6x epilepsy Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.6025 | ATXN7L3 |
Chirag Patel gene: ATXN7L3 was added gene: ATXN7L3 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: ATXN7L3 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: ATXN7L3 were set to PMID: 38753057 Phenotypes for gene: ATXN7L3 were set to Neurodevelopmental disorder, MONDO_0100500 Review for gene: ATXN7L3 was set to GREEN gene: ATXN7L3 was marked as current diagnostic Added comment: This study reports 9 unrelated individuals with de novo heterozygous variants in ATXN7L3 identified through WES testing and GeneMatcher. Core clinical features included: global motor and language developmental delay, hypotonia, and dysmorphic features (hypertelorism, epicanthal folds, blepharoptosis, small nose, small mouth, and low-set posteriorly rotated ears). Variable features included: feeding difficulties, seizures, mild periventricular leukomalacia, and structural cardiac abnormalities. A recurrent nonsense variant [p.(Arg114Ter)] was found in 5/9 individuals. The other variants were 1 frameshift [p.(Ser112LysfsTer12)] and 3 missense variants [p.(Ile71Thr), p.(Ser92Arg), and p.(Leu106Pro)]. They investigated the effects of the recurrent nonsense variant [p.(Arg114Ter)] in fibroblasts of an affected individual. ATXN7L3 protein levels were reduced, and deubiquitylation was impaired (as indicated by an increase in histone H2Bub1 levels). This is consistent with the previous observation of increased H2Bub1 levels in Atxn7l3-null mouse embryos, which have developmental delay and embryonic lethality. Pathogenic variants in deubiquitinating enzymes (DUBs) have been implicated in neurodevelopmental disorders (ND) and congenital abnormalities. ATXN7L3 is a component of the DUB module of the SAGA complex, and two other related DUB modules, and serves as an obligate adaptor protein of 3 ubiquitin-specific proteases (USP22, USP27X or USP51). Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.6017 | SSR4 | Zornitza Stark Mode of inheritance for gene: SSR4 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6016 | SSR4 | Zornitza Stark reviewed gene: SSR4: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Congenital disorder of glycosylation, type Iy, MIM# 300934; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6008 | DMD | Zornitza Stark Mode of inheritance for gene: DMD was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6007 | DMD | Zornitza Stark reviewed gene: DMD: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Duchenne muscular dystrophy MIM#310200; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6001 | SSR4 | Katie Thompson reviewed gene: SSR4: Rating: GREEN; Mode of pathogenicity: None; Publications: PMID: 24218363, 26264460; Phenotypes: intellectual disabilities, hypotonia, microcephaly, seizures, Feeding problems, Facial dysmorphism, Gastrointestinal abnormalities, Failure to thrive, strabismus; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5932 | SLX4 | Zornitza Stark Phenotypes for gene: SLX4 were changed from to Fanconi anaemia, complementation group P, MIM# 613951 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5928 | SLX4 | Zornitza Stark reviewed gene: SLX4: Rating: RED; Mode of pathogenicity: None; Publications: ; Phenotypes: Fanconi anemia, complementation group P, MIM# 613951; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5890 | SLC35A1 | Zornitza Stark changed review comment from: At least 3 families reported.; to: At least 3 families reported, neurological presentation in two. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5881 | LRPPRC | Kirsty Choi reviewed gene: LRPPRC: Rating: GREEN; Mode of pathogenicity: None; Publications: PMID: 21266382, 8392290, 8392291, 26510951; Phenotypes: Mitochondrial complex IV deficiency, nuclear type 5, (French-Canadian), 220111, developmental delay, hypotonia, mild facial dysmorphism, chronic well-compensated metabolic acidosis, high mortality due to episodes of severe acidosis and coma, hypertension, cerebrospinal fluid lactate levels, decreased blood bicarbonate levels, microvesicular steatosis, psychomotor delay, ataxia, hypotonia, transient tachypnea of the newborn, poor sucking, tremor, hypoglycemia, seizures; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5881 | THRA |
Hnin Aung changed review comment from: Over 10 sequence variants (including truncating nonsense and frameshift as well as missense) have been reported in the literature in association with consistent phenotype of mild hypothyroidism (growth retardation, relatively high birth length and weight, mild-to-moderate mental retardation, mild skeletal dysplasia, delayed dentition and constipation) and specific facial features. Milder outcomes for missense variants and more severe phenotype manifestation for truncating variants have been observed. Most of the variants are located in the last exon of the THRA isoform 1 (NM_199334.5; a shorter isoform) affecting the C-terminal ligand binding domain with nonsense and frameshift variants predicted to escape nonsense mediated decay. These variants are either de novo or inherited from an affected parent. A few pedigrees are also available with segregation data. Truncating variants appear to have near complete penetrance whereas missense variants may be associated with variable expressivity (Family C - PMID: 27144938). Functional evidence suggests altered gene product with possible dominant negative effect (PMID: 22168587, 28471274). Knock in mouse model available for E403X presenting with similar phenotype as seen in the human patients, including growth retardation and variable presentation of psychomotor deficit (PMID: 32924834). A small number THRA sequence variant (missense) reported among autism cohort [PMID: 28856816, 25621899].; to: Over 10 sequence variants (including truncating nonsense and frameshift as well as missense) have been reported in the literature in association with consistent phenotype of mild hypothyroidism (growth retardation, relatively high birth length and weight, mild-to-moderate mental retardation, mild skeletal dysplasia, delayed dentition and constipation) and specific facial features. Milder outcomes for missense variants and more severe phenotype manifestations for truncating variants have been observed. Most of the variants are located in the last exon of the THRA isoform 1 (NM_199334.5; a shorter isoform) affecting the C-terminal ligand binding domain with nonsense and frameshift variants predicted to escape nonsense mediated decay. These variants are either de novo or inherited from an affected parent. A few pedigrees are also available with segregation data. Truncating variants appear to have near complete penetrance whereas missense variants may be associated with variable expressivity (Family C - PMID: 27144938). Functional evidence suggests altered gene product with possible dominant negative effect (PMID: 22168587, 28471274). Knock in mouse model available for E403X presenting with similar phenotype as seen in the human patients, including growth retardation and variable presentation of psychomotor deficit (PMID: 32924834). A small number THRA sequence variant (missense) reported among autism cohort [PMID: 28856816, 25621899]. |
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| Intellectual disability syndromic and non-syndromic v0.5881 | THRA |
Hnin Aung changed review comment from: Over 10 sequence variants (including truncating nonsense and frameshift as well as missense) have been reported in the literature in association with consistent phenotype of mild hypothyroidism (growth retardation, relatively high birth length and weight, mild-to-moderate mental retardation, mild skeletal dysplasia, delayed dentition and constipation) and specific facial features. Milder outcomes for missense variants and more severe phenotype manifestation for truncating variants have been observed. Most of the variants are located in the last exon of the THRA isoform 1 (NM_199334.5; a shorter isoform) affecting the C-terminal ligand binding domain with nonsense and frameshift variants predicted to escape nonsense mediated decay. These variants are either de novo or inherited from an affected parent. A few pedigrees are also available with segregation data. Truncating variants appear to have near complete penetrance whereas missense variants may be associated with variable expressivity (Family C - PMID: 27144938). Functional evidence suggests altered gene product with possible dominant negative effect (PMID: 22168587, 28471274). Knock in mouse model available for E403X presenting with similar phenotype as seen in the human patients, including growth retardation and variable presentation of psychomotor deficit (PMID: 32924834). A small number THRA sequence variant (missense) reported among autism cohort [PMID: 28856816, 25621899].; to: Over 10 sequence variants (including truncating nonsense and frameshift as well as missense) have been reported in the literature in association with consistent phenotype of mild hypothyroidism (growth retardation, relatively high birth length and weight, mild-to-moderate mental retardation, mild skeletal dysplasia, delayed dentition and constipation) and specific facial features. Milder outcomes for missense variants and more severe phenotype manifestation for truncating variants have been observed. Most of the variants are located in the last exon of the THRA isoform 1 (NM_199334.5; a shorter isoform) affecting the C-terminal ligand binding domain with nonsense and frameshift variants predicted to escape nonsense mediated decay. These variants are either de novo or inherited from an affected parent. A few pedigrees are also available with segregation data. Truncating variants appear to have near complete penetrance whereas missense variants may be associated with variable expressivity (Family C - PMID: 27144938). Functional evidence suggests altered gene product with possible dominant negative effect (PMID: 22168587, 28471274). Knock in mouse model available for E403X presenting with similar phenotype as seen in the human patients, including growth retardation and variable presentation of psychomotor deficit (PMID: 32924834). A small number THRA sequence variant (missense) reported among autism cohort [PMID: 28856816, 25621899]. |
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| Intellectual disability syndromic and non-syndromic v0.5881 | SLX4 | Lovepreet Gill reviewed gene: SLX4: Rating: RED; Mode of pathogenicity: Loss-of-function variants (as defined in pop up message) DO NOT cause this phenotype - please provide details in the comments; Publications: (PMID: 21240277, 21240275, 23093618, 26453996); Phenotypes: Franconia anemia, complementation group P; Mode of inheritance: BOTH monoallelic and biallelic, autosomal or pseudoautosomal; Current diagnostic: yes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5881 | SOX10 | David Fairbairn changed review comment from: Main mutation mechanism: truncated proteins, potent dominant-negative activity and more severe phenotype only when escapes NMD. Decipher: SOX 10 copy number losses and gains associated with intellectual disability. PCWH Gene2Phenotype: monoallelic-altered gene product structure, DD definitive. Waardenburg syndrome, type 2E Gene2Phenotype: monoallelic-absent gene product, DD definitive. GenCC definitive. OMIM #609136: dominant-negative heterozygous SOX 10 variants in multiple (>3) unrelated cases resulting in neurologic features.; to: Main mutation mechanism: truncated proteins, potent dominant-negative activity and more severe phenotype only when escapes NMD. Decipher: SOX 10 copy number losses and gains associated with intellectual disability. PCWH Gene2Phenotype: monoallelic-altered gene product structure, DD definitive. Waardenburg syndrome, type 2E Gene2Phenotype: monoallelic-absent gene product, DD definitive. GenCC definitive. OMIM #609136: dominant-negative heterozygous SOX 10 variants in multiple (>3) unrelated cases resulting in neurologic features. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5881 | SOX10 | David Fairbairn reviewed gene: SOX10: Rating: GREEN; Mode of pathogenicity: None; Publications: PMID: 10762540, 34667088, 38132479; Phenotypes: PCWH (Peripheral demyelinating neuropathy Central demyelination, Waardenburg and Hirschsprung disease) syndrome (OMIM #609136), Waardenburg syndrome, type 2E, with or without neurologic involvement (OMIM #611584); Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5873 | SPECC1L | Ibrahim El-Deek changed review comment from: There is paucity of literature directly linking SPECC1L variants to intellectual disability and developmental delay. However, Zhang et al. (PMID: 31953237) reviewed 33 patients from 14 families with SPECC1L variants, noting that the most common features were dysmorphic facial characteristics. Developmental delays were reported in 24.2% of patients (8/33), with some achieving normal development during childhood.; to: There is paucity of literature directly linking SPECC1L variants to intellectual disability and developmental delay. However, Zhang et al. (PMID: 31953237) reviewed 33 patients from 14 families with SPECC1L variants (including 10 missense point mutation and 1 deletion), noting that the most common features were dysmorphic facial characteristics. Developmental delays were reported in 24.2% of patients (8/33), with some achieving normal development during childhood. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5872 | L1CAM | Zornitza Stark Mode of inheritance for gene: L1CAM was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5864 | MBTPS2 | Zornitza Stark Mode of inheritance for gene: MBTPS2 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5862 | MED12 | Zornitza Stark Mode of inheritance for gene: MED12 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5854 | MID1 | Zornitza Stark Mode of inheritance for gene: MID1 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5852 | NDP | Zornitza Stark Mode of inheritance for gene: NDP was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5848 | OCRL | Zornitza Stark Mode of inheritance for gene: OCRL was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5845 | OFD1 | Zornitza Stark Mode of inheritance for gene: OFD1 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5843 | PLP1 | Zornitza Stark Mode of inheritance for gene: PLP1 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5840 | PORCN | Zornitza Stark Mode of inheritance for gene: PORCN was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5838 | PTCHD1 | Zornitza Stark Mode of inheritance for gene: PTCHD1 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5826 | ZNF41 | Zornitza Stark Mode of inheritance for gene: ZNF41 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5821 | ZNF81 | Sangavi Sivagnanasundram reviewed gene: ZNF81: Rating: RED; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:006590; Phenotypes: X-linked intellectual disability MONDO:0100284; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5821 | ZNF674 | Sangavi Sivagnanasundram reviewed gene: ZNF674: Rating: RED; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:006588; Phenotypes: X-linked intellectual disability MONDO:0100284; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5821 | ZNF41 | Sangavi Sivagnanasundram reviewed gene: ZNF41: Rating: RED; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:006585; Phenotypes: non-syndromic X-linked intellectual disability MONDO:0019181; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5821 | ZDHHC15 | Sangavi Sivagnanasundram reviewed gene: ZDHHC15: Rating: RED; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:006573; Phenotypes: X-linked complex neurodevelopmental disorder MONDO:0100148; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5821 | SHROOM4 | Sangavi Sivagnanasundram reviewed gene: SHROOM4: Rating: RED; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:006141; Phenotypes: X-linked complex neurodevelopmental disorder MONDO:0100148; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5821 | PTCHD1 | Sangavi Sivagnanasundram reviewed gene: PTCHD1: Rating: GREEN; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:005921; Phenotypes: non-syndromic X-linked intellectual disability MONDO:0019181; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5821 | PORCN | Sangavi Sivagnanasundram reviewed gene: PORCN: Rating: GREEN; Mode of pathogenicity: None; Publications: 20301712; Phenotypes: focal dermal hypoplasia MONDO:0010592; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5821 | PLP1 | Sangavi Sivagnanasundram reviewed gene: PLP1: Rating: GREEN; Mode of pathogenicity: Other; Publications: https://search.clinicalgenome.org/CCID:005834; Phenotypes: Pelizeaus-Merzbacher spectrum disorder MONDO:0010714; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5821 | OFD1 | Sangavi Sivagnanasundram reviewed gene: OFD1: Rating: GREEN; Mode of pathogenicity: None; Publications: 24884629; Phenotypes: ciliopathy MONDO:0005308; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5821 | OCRL | Sangavi Sivagnanasundram reviewed gene: OCRL: Rating: GREEN; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:005696; Phenotypes: oculocerebrorenal syndrome MONDO:0010645; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5821 | NDP | Sangavi Sivagnanasundram reviewed gene: NDP: Rating: AMBER; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:005574; Phenotypes: Norrie disease MONDO:0010691; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5821 | MID1 | Sangavi Sivagnanasundram reviewed gene: MID1: Rating: GREEN; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:005386; Phenotypes: X-linked Opitz G/BBB syndrome MONDO:0010222; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5821 | MED12 | Sangavi Sivagnanasundram reviewed gene: MED12: Rating: GREEN; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:005361; Phenotypes: MED12-related intellectual disability syndrome MONDO:0100000; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5821 | MBTPS2 | Sangavi Sivagnanasundram reviewed gene: MBTPS2: Rating: GREEN; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:005345; Phenotypes: IFAP syndrome 1, with or without BRESHECK syndrome MONDO:0100213; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5821 | MAGT1 | Sangavi Sivagnanasundram reviewed gene: MAGT1: Rating: RED; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:005319; Phenotypes: X-linked intellectual disability MONDO:0100284; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5821 | L1CAM | Sangavi Sivagnanasundram reviewed gene: L1CAM: Rating: GREEN; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:005260; Phenotypes: L1 syndrome MONDO:0017140; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5821 | IGBP1 | Sangavi Sivagnanasundram reviewed gene: IGBP1: Rating: RED; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:005117; Phenotypes: corpus callosum agenesis-intellectual disability-coloboma-micrognathia syndrome MONDO:0010333; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5821 | IDS | Sangavi Sivagnanasundram reviewed gene: IDS: Rating: GREEN; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:005112; Phenotypes: mucopolysaccharidosis type 2 MONDO:0010674; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5821 | HPRT1 | Sangavi Sivagnanasundram reviewed gene: HPRT1: Rating: GREEN; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:005082; Phenotypes: Lesch-Nyhan syndrome MONDO:0010298; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5821 | GPC3 | Sangavi Sivagnanasundram reviewed gene: GPC3: Rating: GREEN; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:004990; Phenotypes: Simpson-Golabi-Behmel syndrome MONDO:0010731; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5821 | GDI1 | Sangavi Sivagnanasundram reviewed gene: GDI1: Rating: ; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:004941; Phenotypes: non-syndromic X-linked intellectual disability MONDO:0019181; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5821 | FTSJ1 | Sangavi Sivagnanasundram reviewed gene: FTSJ1: Rating: GREEN; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:004892; Phenotypes: X-linked complex neurodevelopmental disorder MONDO:0100148; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5821 | FMR1 | Sangavi Sivagnanasundram reviewed gene: FMR1: Rating: GREEN; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:004870; Phenotypes: fragile X syndrome MONDO:0010383; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5816 | AGTR2 | Zornitza Stark Mode of inheritance for gene: AGTR2 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5811 | CASK | Zornitza Stark Mode of inheritance for gene: CASK was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5804 | DKC1 | Zornitza Stark Mode of inheritance for gene: DKC1 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5799 | FLNA | Zornitza Stark Mode of inheritance for gene: FLNA was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5798 | FLNA | Sangavi Sivagnanasundram reviewed gene: FLNA: Rating: GREEN; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:004863; Phenotypes: periventricular nodular heterotopia MONDO:0020341; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5798 | DKC1 | Sangavi Sivagnanasundram reviewed gene: DKC1: Rating: GREEN; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:004651; Phenotypes: DKC1-related disorder MONDO:0100152; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5798 | CLIC2 | Sangavi Sivagnanasundram reviewed gene: CLIC2: Rating: RED; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:004469; Phenotypes: X-linked complex neurodevelopmental disorder MONDO:0100148; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5798 | CASK | Sangavi Sivagnanasundram reviewed gene: CASK: Rating: GREEN; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:004345; Phenotypes: X-linked syndromic intellectual disability MONDO:0020119; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5798 | BCORL1 | Sangavi Sivagnanasundram reviewed gene: BCORL1: Rating: ; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:004254; Phenotypes: Shukla-Vernon syndrome MONDO:0026727; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5797 | AGTR2 | Sangavi Sivagnanasundram reviewed gene: AGTR2: Rating: RED; Mode of pathogenicity: None; Publications: https://search.clinicalgenome.org/CCID:004075; Phenotypes: X-linked complex neurodevelopmental disorder MONDO:0100148; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5786 | PRMT9 |
Chirag Patel gene: PRMT9 was added gene: PRMT9 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: PRMT9 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: PRMT9 were set to PMID: 38561334 Phenotypes for gene: PRMT9 were set to Neurodevelopmental disorder, MONDO:0100500 Review for gene: PRMT9 was set to RED Added comment: A homozygous variant (G189R) in PRMT9 is reported based on large WGS study in 136 consanguineous families - unclear if only found in 1 family and no clinical information on case(s). PMRTs (protein arginine methyltransferases) catalyse post translational modification via arginine methylation. Functional studies showed that the G189R variant abolishes PRMT9's methyltransferase activity - specifically at the R508 residue of SF3B2 RNA (exclusively methylated by PRMT9) - and leads to heavy PRMT9 ubiquitination, and abnormal splicing activity of SF3B2. Knock out mouse model showed PRMT9 loss in excitatory neurons leads to aberrant synapse development and impaired learning and memory. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5738 | CEP295 |
Chirag Patel gene: CEP295 was added gene: CEP295 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: CEP295 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: CEP295 were set to PMID: 38154379 Phenotypes for gene: CEP295 were set to Seckel syndrome 11, OMIM # 620767 Review for gene: CEP295 was set to GREEN gene: CEP295 was marked as current diagnostic Added comment: 4 children from 2 unrelated families with Seckel-like syndrome - severe primary microcephaly, short stature, developmental delay, intellectual disability, facial deformities, and abnormalities of fingers and toes. WES identified biallelic pathogenic variants in CEP295 gene (p(Q544∗) and p(R1520∗); p(R55Efs∗49) and p(P562L)). Patient-derived fibroblasts and CEP295-depleted U2OS and RPE1 cells were used to clarify the underlying mechanisms. Depletion of CEP295 resulted in a decrease in the numbers of centrioles and centrosomes and triggered p53-dependent G1 cell cycle arrest. Loss of CEP295 caused extensive primary ciliary defects in both patient-derived fibroblasts and RPE1 cells. The results from complementary experiments revealed that the wild-type CEP295, but not the mutant protein, can correct the developmental defects of the centrosome/centriole and cilia in the patient-derived skin fibroblasts. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5728 | DOCK4 | Sangavi Sivagnanasundram reviewed gene: DOCK4: Rating: ; Mode of pathogenicity: None; Publications: PMID: 38526744; Phenotypes: DOCK4-related neurodevelopmental disorder (MONDO:0060490); Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5714 | SLC12A9 |
Zornitza Stark gene: SLC12A9 was added gene: SLC12A9 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: SLC12A9 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: SLC12A9 were set to 38334070 Phenotypes for gene: SLC12A9 were set to Neurodevelopmental disorder, MONDO:0700092, SLC12A9-related Review for gene: SLC12A9 was set to GREEN Added comment: Three individuals from unrelated families with bi-allelic LoF variants and a neurodevelopmental phenotype, skeletal abnormalities, brain abnormalities, hypopigmentation, dysmorphic features. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5712 | SNF8 |
Chern Lim gene: SNF8 was added gene: SNF8 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: SNF8 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: SNF8 were set to 38423010 Phenotypes for gene: SNF8 were set to Severe developmental delay, epileptic encephalopathy, brain MRI abnormality; intellectual disability, childhood-onset optic atrophy, ataxia Review for gene: SNF8 was set to GREEN gene: SNF8 was marked as current diagnostic Added comment: PMID: 38423010 - Nine individuals from six families presenting with a spectrum of neurodevelopmental/neurodegenerative features caused by bi-allelic variants in SNF8. In total, three putative LoF variants and four missense variants were identified. - The phenotypic spectrum included four individuals with severe developmental and epileptic encephalopathy, massive reduction of white matter, hypo-/aplasia of the corpus callosum, neurodevelopmental arrest, and early death. A second cohort shows a milder phenotype with intellectual disability, childhood-onset optic atrophy, or ataxia. All mildly affected individuals shared the same hypomorphic variant, c.304G>A (p.Val102Ile) as compound heterozygous. - Functional studies using fibroblasts derived from patients and zebrafish model showed LoF is the disease mech. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5706 | ZFX |
Sarah Leigh gene: ZFX was added gene: ZFX was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: ZFX was set to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) Publications for gene: ZFX were set to 26350204; 26740508; 38325380 Phenotypes for gene: ZFX were set to X-linked neurodevelopmental disorder with recurrent facial gestalt Review for gene: ZFX was set to GREEN Added comment: To date, germline variants in ZFX have not been associated with a phenotype in OMIM or Gen2Phen. A single ZFX variant has been associated with a neurodevelopmental disorder, that has a Rett syndrome-like phenotype disorder, in a 14 year old male. The ZFX variant was allelic with another X-linked variant in SHROOM4. These variants were inherited from the mother, who had random X inactivation pattern (PMID: 26740508). PMID: 38325380 reports 11 ZFX variants in 18 subjects from 16 unrelated families (14 males and 4 females) with an X-linked neurodevelopmental disorder with recurrent facial gestalt. Seven variants were truncating and the remaining were missense variants within the Zinc finger array. In the pedigree of family 6 (figure 3, PMID: 38325380), it was apparent that there were female carriers of the ZFX variant (GRCh38 chrX: 24229396A>G, c.2438A>G, p.Tyr774Cys) with hyperparathyroidism and two affected males and one affected female, with the neurodevelopmental disorder. It appeared that skewed X-inactivation in the female carriers was responsible for the different phenotypic features. The association between ZFX variants and a novel neurodevelopmental disorder, was further supported by functional studies showing altered transcriptional activity in missense variants and altered behavior in a zebrafish loss-of-function model. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5690 | SYN1 | Zornitza Stark Mode of inheritance for gene: SYN1 was changed from BIALLELIC, autosomal or pseudoautosomal to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5687 | WDR44 |
Zornitza Stark gene: WDR44 was added gene: WDR44 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: WDR44 was set to X-LINKED: hemizygous mutation in males, biallelic mutations in females Publications for gene: WDR44 were set to 38191484 Phenotypes for gene: WDR44 were set to Ciliopathy, MONDO:0005308, WDR44-related Review for gene: WDR44 was set to GREEN Added comment: 11 male patients with 6 missense and 1 nonsense variant in WDR44 displaying a wide range of cognitive impairment and variable congenital anomalies associated with primary cilium dysfunction. All patients had learning difficulties with 8 labelled as intellectually disabled (mild-moderate). Other clinical features included anomalies of craniofacial, musculoskeletal, brain, renal and cardiac development. WDR44 is a negative regulator of ciliogenesis. Increased binding is hypothesised to underlie the pathogenicity of WDR44 variants identified in this cohort. Functional data supported impaired ciliogenesis initiation in patient fibroblasts and a zebrafish model. A zebrafish model recapitulated the human phenotype when morphants expressed WDR44 L668S, D669N, S764F, G782C, H839R, and R733* variants. Of note, D648G or N840S did not recapitulate the phenotype in the zebrafish model. The studies supported a GoF mechanism, but the authors could not rule out that LoF of WDR44 contributes to the ciliopathy-like phenotype observed, because protein expression data was only available for a limited number of patients. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5682 | CAMK2D |
Elena Savva gene: CAMK2D was added gene: CAMK2D was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: CAMK2D was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: CAMK2D were set to PMID: 38272033 Phenotypes for gene: CAMK2D were set to Neurodevelopmental disorder (MONDO#0700092), CAMK2D-related Review for gene: CAMK2D was set to GREEN Added comment: PMID: 38272033 - 8 patients (5/8 de novo) with mostly missense and a single splice site variant, ages range from 5 weeks to 20 years old - Most variants functionally shown to have a GOF mechanism causing addition DCM phenotype, LOF is only neurological - Phenotypes include dev delay (mild-severe) (7/7 patients), skeletal anomalies (7/8, scoliosis, kyphosis, involving spine/hands/feet/palate), DCM (6/8), seizures (3/8), visual anomalies (astigmatism, cortical vision impairment, myopia, strabismus 5/5), enlarged brain ventricles (3/5) Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5675 | POLR1A | Zornitza Stark Mode of inheritance for gene: POLR1A was changed from MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown to BOTH monoallelic and biallelic, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5671 | KCTD13 | Elena Savva Mode of inheritance for gene: KCTD13 was changed from Unknown to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5660 | ZRSR2 |
Chris Ciotta gene: ZRSR2 was added gene: ZRSR2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: ZRSR2 was set to X-LINKED: hemizygous mutation in males, biallelic mutations in females Publications for gene: ZRSR2 were set to PMID: 38158857 Phenotypes for gene: ZRSR2 were set to Orofacialdigital syndrome MONDO:0015375, ZRSR2-related Review for gene: ZRSR2 was set to GREEN Added comment: Oral-facial-digital (OFD) syndrome with brain anomalies ranging from alobar holoprosencephaly to pituitary anomalies. Six unrelated families with two truncating variants and functional studies: - p.(Gly404GlufsTer23): detected in one family with 2x affected males - p.(Arg403GlyfsTer24): 5 unrelated families, both de novo and inherited Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5646 | MANF |
Zornitza Stark gene: MANF was added gene: MANF was added to Intellectual disability syndromic and non-syndromic. Sources: Expert Review Mode of inheritance for gene: MANF was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: MANF were set to 26077850; 33500254; 34815294 Phenotypes for gene: MANF were set to Diabetes, deafness, developmental delay, and short stature syndrome, MIM# 620651 Review for gene: MANF was set to AMBER Added comment: Two individuals reported with homozygous variants. Mouse model recapitulates deafness phenotype. Sources: Expert Review |
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| Intellectual disability syndromic and non-syndromic v0.5639 | PLA2G16 | Zornitza Stark Mode of inheritance for gene: PLA2G16 was changed from MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown to BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5631 | SV2A |
Karina Sandoval gene: SV2A was added gene: SV2A was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: SV2A was set to BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal Publications for gene: SV2A were set to PMID: 37985816 Phenotypes for gene: SV2A were set to Epilepsy, MONDO:0005027; microcephaly MONDO:0001149; intellectual disability MONDO:0001071 Review for gene: SV2A was set to AMBER Added comment: Monoallelic variants cause epilepsy. Biallelic variant in this 5yo with p.Arg289Ter and another 5yo from another paper with homozygous p.Arg383Gln, reported to cause severe phenotype of drug-resistant epileptic encephalopathy with microcephaly, DD, movement disorder and growth retardation. This paper references 5 other families with both AR & AD Family #1 – p.Arg383Gln, AR, 2 affected in family, parents healthy carriers Family #2 – p.Arg570Cys, AD, 2 affected, inherited from affected mother (in gnomAD v2 1 het, absent from gnomAD v3) Family #3 – p.Gly660Arg, AD, de novo Family #4 – p.Gly660Arg, AD, segregated in 11 family members Family #5 (this study) – p.Arg289Ter, AR, parents and 2 sibs asymptomatic carriers Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5631 | CRELD1 |
Naomi Baker gene: CRELD1 was added gene: CRELD1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: CRELD1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: CRELD1 were set to PMID: 37947183 Phenotypes for gene: CRELD1 were set to Neurodevelopmental disorder (MONDO:0700092), CRELD1-related Review for gene: CRELD1 was set to GREEN Added comment: Publication reports 18 individuals from 14 unrelated families affected by biallelic recessive variants in CRELD1, presenting with early-onset neurodevelopmental features, most notably hypotonia and epilepsy, with developmental plateauing and slowly progressive nonneurologic medical complexities in survivors, including cardiac rhythm disturbances and frequent infections. Most individuals have a missense variant in trans with a putative null allele. Four variants were re-current: p.(Cys192Tyr) in 10 families, p.(Gln320Argfs) in 5 families, p.(Ala377Thrfs) in 2 families, and p.(Met369Val) also in 2 families. Some functional studies also reported (Xenopus tropicalis). Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5628 | PLA2G16 | Lauren Rogers reviewed gene: PLA2G16: Rating: GREEN; Mode of pathogenicity: None; Publications: PMID: 37919452; Phenotypes: Lipodystrophy (MONDO:0006573); Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5628 | PLA2G16 |
Lauren Rogers gene: PLA2G16 was added gene: PLA2G16 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: PLA2G16 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: PLA2G16 were set to PMID: 37919452 Phenotypes for gene: PLA2G16 were set to Lipodystrophy (MONDO:0006573) Added comment: 7 patients from 4 unrelated consanguineous families with homozygous loss of function PTC variants. Features: 4/7 metabolic features, 6/7 neurological/skeletal features, 3/7 Psychomotor retardation/intellectual disability, 5/7 demyelinating peripheral neuropathy. Null mouse and patient derived white adipose tissue showed enrichment of arachidonic acid-containing membrane phospholipids and a strong decrease in PPARγ. CRISPR–Cas9-mediated PLAAT3 inactivation in human adipose stem cells induced insulin resistance, altered adipocyte differentiation with decreased lipid droplet formation and reduced the expression of adipogenic and mature adipocyte markers, including PPARγ. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5627 | SEL1L |
Sarah Pantaleo gene: SEL1L was added gene: SEL1L was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: SEL1L was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: SEL1L were set to PMID: 37943610; PMID: 37943617 Phenotypes for gene: SEL1L were set to Neurodevelopmental disorder, MONDO:0700092, SEL1L-related Penetrance for gene: SEL1L were set to Complete Review for gene: SEL1L was set to GREEN Added comment: Wang paper PMID: 37943610 SEL1L protein is involved in the SEL1L-HRD1 endoplasmic reticulum (ER)-associated degradation. Report two biallelic missense variants in SEL1L in six children from three independent families presenting with developmental delay, intellectual disability, microcephaly, facial dysmorphisms, hypotonia and/or ataxia (termed ERAD-associated neurodevelopment disorder with onset in infancy (ENDI). The variants were hypomorphic and impaired ERAD function. Identified by WES. Parents heterozygous and asymptomatic. P.(Gly585Asp) in Patient 1, p.(Met528Arg) in Patients 2 and 3 (siblings). All variants cause substrate accumulation. The extent of substrate accumulation in knockin cells was modest compared to those in knockout cells, pointing to a hypomorphic nature. They also had a variant in HRD1. Weis paper PMID: 37943617 Third variant p.(Cys141Tyr), biallelic, causing premature death in five patients from a consanguineous family with early-onset neurodevelopmental disorders and agammaglobulinaemia due to severe SEL1L-HRD1 ERAD dysfunction. This variant appears to have a more severe outcome, exhibiting B cell depletion and agammaglobulinaemia, causing the most severe dysfunction among all of the variants described by this group so far. They postulate that functionality of SEL1L-HRD1 ERAD is inversely correlated with disease severity in humans. Their symptoms were dev delay, neurological disorder and agammaglobulinaemia in childhood. Along with severe axial hypotonia, short stature and microcephaly. “Not a complete loss-of-function variant”. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5624 | PPID |
Elena Savva gene: PPID was added gene: PPID was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: PPID was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: PPID were set to 37977818 Phenotypes for gene: PPID were set to Stutter disorder, (MONDO:0000723), PPID-related Review for gene: PPID was set to RED Added comment: PMID: 37977818 - a large family (10 affected confirmed to have the variant) with stuttering/language disorder and a het missense (p.(Pro270Ser)). Mouse K/I model showed microstructural changes in the corticospinal tract Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5622 | GRIA3 | Zornitza Stark Mode of inheritance for gene: GRIA3 was changed from X-LINKED: hemizygous mutation in males, biallelic mutations in females to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5621 | GRIA3 | Zornitza Stark reviewed gene: GRIA3: Rating: GREEN; Mode of pathogenicity: None; Publications: 38038360; Phenotypes: Intellectual developmental disorder, X-linked, syndromic, Wu type (MIM#300699); Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5618 | WNK3 | Zornitza Stark reviewed gene: WNK3: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Prieto syndrome, MIM# 309610; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5602 | SGSM3 |
Dean Phelan gene: SGSM3 was added gene: SGSM3 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: SGSM3 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: SGSM3 were set to PMID: 37833060 Phenotypes for gene: SGSM3 were set to Neurodevelopmental disorder (MONDO:0700092), SGSM3-related Review for gene: SGSM3 was set to GREEN Added comment: PMID: 37833060 - 13 patients from 8 families of Ashkenazi Jewish origin all had the same homozygous frameshift variant (c.981dup). Predicted to cause NMD. The variant co-segregated with disease in all available family members. The affected individuals displayed mild global developmental delay and mild to moderate intellectual disability. Additional prevalent phenotypes observed included hypotonia, behavioural challenges and short stature. Considered a founder variant (1 in 52 Ashkenazi Jews carry the variant). Also present in other populations but no homozygotes in gnomAD. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5601 | DLG2 |
Elena Savva gene: DLG2 was added gene: DLG2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: DLG2 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: DLG2 were set to PMID: 37860969 Phenotypes for gene: DLG2 were set to Intellectual disability (MONDO#0001071), DLG2-related Review for gene: DLG2 was set to AMBER Added comment: PMID: 37860969 - 13 patients from 10 families with neurodevelopmental disorders, dysmorphic features and intragenic deletions including both exonic (minimal affect all transcripts) and UTR regions. Majority of variants were inherited, some de novo. But many NMD PTCs in gnomAD (some looking messy, in noncanonical transcript etc.) Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5598 | ELP1 |
Sarah Pantaleo gene: ELP1 was added gene: ELP1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: ELP1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: ELP1 were set to PMID: 36864284 Phenotypes for gene: ELP1 were set to Neurodevelopmental disorder, MONDO:0700092, ELP1-related Review for gene: ELP1 was set to RED Added comment: “A novel ELP1 mutation impairs the function of the Elongator complex and causes a severe neurodevelopment disorder”. The Elongator complex is suggested to play a role in NDDs, given that patient-derived mutations in its ELP2, ELP3, ELP4 and ELP6 subunits have been associated with these disorders. Pathogenic variants in ELP1 have been previously found in familial dysautonomia and medulloblastoma, with no link to NDDs affecting primarily the central nervous system. Clinical investigation included patient history and physical, neurological and MRI. A novel homozygous likely pathogenic ELP1 variant was identified by WGS (absent from gnomAD). Functional studies included in silico analysis of the mutated ELP1 in the context of the holo-complex, production and purification of the ELP1 harbouring the identified mutation and in vitro analyses. Report a novel missense mutation in the ELP1 identified in two siblings with ID and GDD (both less than 10 years old). The mutation is shown to perturb the ability of ELP123 to bind tRNAs and compromises the function of the Elongator in vitro and in human cells. Both sibling are non-verbal and had severe ID/GDD. MRI revealed white matter lesions with enlarged perivascular spaces, suggestive of an inflammatory reaction associate with demyelination. WGS identified c.2444A>C; p.(Lys815Thr), homozygous in both siblings. Consanguineous family. Parents heterozygous and asymptomatic. Carry out significant functional studies. Conclude that screening for ELP1 mutations “may be beneficial”. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5591 | ZFHX3 | Chirag Patel edited their review of gene: ZFHX3: Added comment: 41 patients with protein truncating variants (PTVs) or (partial) deletions of ZFHX3. Presentations included (mild) ID and/or behavioural problems, postnatal growth retardation, feeding difficulties, dysmorphism (rarely cleft palate). Nuclear abundance of ZFHX3 increases during human brain development and neuronal differentiation in neural stem cells and SH-SY5Y cells, ZFHX3 interacts with the chromatin remodelling BRG1/Brm-associated factor complex and the cleavage and polyadenylation complex. ZFHX3 haploinsufficiency associates with a specific DNA methylation profile in leukocyte-derived DNA, and participates in chromatin remodelling and mRNA processing.; Changed rating: GREEN; Changed publications: PMID: 37292950; Changed phenotypes: Neurodevelopmental disorder; Changed mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted; Set current diagnostic: yes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5579 | ATP6AP2 | Zornitza Stark Mode of inheritance for gene: ATP6AP2 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5578 | ATP6AP2 | Zornitza Stark reviewed gene: ATP6AP2: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Congenital disorder of glycosylation, type IIr MIM#301045 Intellectual developmental disorder, X-linked, syndromic, Hedera type MIM#300423; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5554 | SMC1A | Zornitza Stark Mode of inheritance for gene: SMC1A was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5549 | SMC1A | Kaitlyn Dianna Weldon reviewed gene: SMC1A: Rating: GREEN; Mode of pathogenicity: None; Publications: 20301283; Phenotypes: Cornelia de Lange syndrome 2 MONDO:0010370; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5523 | TAZ | Zornitza Stark Mode of inheritance for gene: TAZ was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5522 | TAT | Zornitza Stark Marked gene: TAT as ready | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5522 | TAT | Zornitza Stark Gene: tat has been classified as Green List (High Evidence). | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5522 | TAT | Zornitza Stark Phenotypes for gene: TAT were changed from to tyrosinemia type II MONDO:0010160 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5521 | TAT | Zornitza Stark Publications for gene: TAT were set to | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5520 | TAT | Zornitza Stark Mode of inheritance for gene: TAT was changed from Unknown to BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5514 | MYCN | Naomi Baker commented on gene: MYCN: Three individuals now reported with gain-of-function missense variants (identical variant in two individuals). Clinical presentation includes megalencephaly, hypoplastic corpus callosum, postaxial polydactyly, intellectual disability and motor delay. Knock-in mouse model showed morphological manifestations in multiple tissues including digits, female reproductive system and kidney. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5509 | ZBTB47 |
Elena Savva gene: ZBTB47 was added gene: ZBTB47 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: ZBTB47 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: ZBTB47 were set to 37743782 Phenotypes for gene: ZBTB47 were set to Neurodevelopmental disorder (MONDO#0700092), ZBTB47-related Review for gene: ZBTB47 was set to GREEN Added comment: PMID 37743782: - 5 patients with de novo missense, 4/5 have a recurring p.Gly477Lys. Probands have intellectual disability (5/5), seizures (5/5), hypotonia (5/5), gait abnormalities, and variable movement abnormalities (5/5). - Missense variants are positioned close to His and Cys residues involved in forming C2H2 zinc fingers. - No functional studies performed - Minimal PTCs in gnomAD Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5508 | TAT | Kaitlyn Dianna Weldon reviewed gene: TAT: Rating: GREEN; Mode of pathogenicity: None; Publications: 28255985; Phenotypes: tyrosinemia type II MONDO:0010160; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5508 | TAZ | Kaitlyn Dianna Weldon reviewed gene: TAZ: Rating: GREEN; Mode of pathogenicity: None; Publications: 25299040; Phenotypes: Barth syndrome MONDO:0010543; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5507 | ATRX | Zornitza Stark Mode of inheritance for gene: ATRX was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5506 | ATRX | Zornitza Stark reviewed gene: ATRX: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: ATR-X-related syndrome MONDO:0016980; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5433 | WDR45 | Zornitza Stark Mode of inheritance for gene: WDR45 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5423 | XRCC4 | Zornitza Stark Phenotypes for gene: XRCC4 were changed from to Short stature, microcephaly, and endocrine dysfunction MIM#616541, MONDO:0014686 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5415 | ZDHHC9 | Zornitza Stark Mode of inheritance for gene: ZDHHC9 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5399 | PTEN | Claire Fryer-Smith reviewed gene: PTEN: Rating: GREEN; Mode of pathogenicity: None; Publications: 21194675, 1859181, 23470840; Phenotypes: Cowden syndrome 1 MIM#158350, Lhermitte-Duclos disease MIM#158350, Macrocephaly/autism syndrome MIM#605309, Prostate cancer, somatic MIM#176807; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5399 | WDR45 | Kaitlyn Dianna Weldon reviewed gene: WDR45: Rating: GREEN; Mode of pathogenicity: None; Publications: 28211668; Phenotypes: X-linked complex neurodevelopmental disorder MONDO:0100148, neurodegeneration with brain iron accumulation 5 MONDO:0010476; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5399 | XRCC4 | Claire Fryer-Smith reviewed gene: XRCC4: Rating: GREEN; Mode of pathogenicity: None; Publications: 25872942, 25839420, 18695064; Phenotypes: Short stature, microcephaly, and endocrine dysfunction MIM#616541; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5399 | XRCC4 | Kaitlyn Dianna Weldon reviewed gene: XRCC4: Rating: GREEN; Mode of pathogenicity: None; Publications: 25728776; Phenotypes: short stature, microcephaly, and endocrine dysfunction MONDO:0014686; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5399 | ZDHHC9 | Kaitlyn Dianna Weldon reviewed gene: ZDHHC9: Rating: GREEN; Mode of pathogenicity: None; Publications: 17436253; Phenotypes: Syndromic X-linked intellectual disability Raymond type MONDO:0010427; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5385 | PPP1R3F |
Andrew Fennell gene: PPP1R3F was added gene: PPP1R3F was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: PPP1R3F was set to X-LINKED: hemizygous mutation in males, biallelic mutations in females Publications for gene: PPP1R3F were set to 37531237 Phenotypes for gene: PPP1R3F were set to Neurodevelopmental Disorder, MONDO:0700092,PPP1R3F-related Review for gene: PPP1R3F was set to GREEN Added comment: 13 unrelated hemizygous individuals reported with functional evidence Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5364 | ARX | Zornitza Stark Mode of inheritance for gene: ARX was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5363 | ARX | Zornitza Stark reviewed gene: ARX: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Lissencephaly, X-linked 2, MIM# 300215; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5357 | UBAP2L | Zornitza Stark Phenotypes for gene: UBAP2L were changed from Neurodevelopmental disorder, MONDO:0700092, UBAP2L-related; Delayed speech and language development; Motor delay; Intellectual disability; Autistic behavior; Seizures; Microcephaly; Abnormality of head or neck; Short stature; Abnormality of the skeletal system to Neurodevelopmental disorder with impaired language, behavioral abnormalities, and dysmorphic facies, MIM# 620494; Delayed speech and language development; Motor delay; Intellectual disability; Autistic behavior; Seizures; Microcephaly; Abnormality of head or neck; Short stature; Abnormality of the skeletal system | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5348 | AIFM1 | Zornitza Stark Mode of inheritance for gene: AIFM1 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5347 | AIFM1 | Zornitza Stark reviewed gene: AIFM1: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Combined oxidative phosphorylation deficiency 6, 300816, Cowchock syndrome, 310490, Spondyloepimetaphyseal dysplasia, X-linked, with hypomyelinating leukodystrophy, 300232; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5341 | NEUROG1 |
Zornitza Stark gene: NEUROG1 was added gene: NEUROG1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: NEUROG1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: NEUROG1 were set to 23419067; 26077850; 33439489; 36647078 Phenotypes for gene: NEUROG1 were set to Cranial dysinnervation disorder, congenital, with absent corneal reflex and developmental delay, OMIM:620469 Review for gene: NEUROG1 was set to GREEN Added comment: There are four unrelated cases reported with global developmental delay/ intellectual disability. PMID:23419067 - A homozygous micro deletion of NEUROG1 was identified in a six year-old boy presenting with profound sensorineural deafness, balance disorder, severe disorder of oral motor function, and mild global developmental delay. His IQ was normal. PMID:26077850 - A homozygous NEUROG1 variant (p.Arg116Leu) was identified in a 12 year-old boy presented with syndromic corneal opacity, mild intellectual disability and absent corneal reflex. PMID:33439489 - A homozygous loss-of-function variant (p.Glu68Ter) was identified in a 12 year-old boy presenting with hypotonia, global developmental delay, sensorineural hearing loss, and keratoconjunctivitis due to lack of corneal reflex. This patient had a global IQ of 62 at the age of ten. PMID:36647078 - A female proband was identified with a novel homozygous truncating frameshift variant (p.Thr78ProfsTer122 and was reported with profound global developmental delay, autism spectrum disorder, hearing loss, corneal opacity and no eye blinking. Her sister also had a similar, but less severe phenotype and also harboured the same variant at homozygous state. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5317 | PHF5A |
Daniel Flanagan gene: PHF5A was added gene: PHF5A was added to Intellectual disability syndromic and non-syndromic. Sources: Expert list Mode of inheritance for gene: PHF5A was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: PHF5A were set to PMID: 37422718 Phenotypes for gene: PHF5A were set to Neurodevelopmental disorder (MONDO#0700092), PHF5A-related Review for gene: PHF5A was set to GREEN Added comment: Nine subjects with congenital malformations, including hypospadias, growth abnormalities, and developmental delay who had de novo PHF5A variants. Prenatally, six subjects had intrauterine growth retardation. All subjects had motor and speech delay and developmental delay. Congenital abnormalities comprised hypospadias in three of four male subjects, and heart defects (3/9), inguinal hernia (3/9), and sacral dimple (3/9). Six of the nine subjects had short stature. Craniofacial dysmorphism is variable in the nine subjects, high forehead and preauricular skin tag(s) in five subjects. Sources: Expert list |
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| Intellectual disability syndromic and non-syndromic v0.5311 | NAA30 |
Sarah Pantaleo gene: NAA30 was added gene: NAA30 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: NAA30 was set to Unknown Publications for gene: NAA30 were set to PMID: 37387332 Penetrance for gene: NAA30 were set to unknown Review for gene: NAA30 was set to RED Added comment: Report a de novo heterozygous NAA30 nonsense variant c.244C>T, p.(Gln82*) in a 5yo boy with GDD, ASD, hypotonia, seizures, tracheal cleft and recurrent respiratory infections. Seizures resolved after two weeks of life. Family history of ASD in older sister. Epilepsy in mother, childhood onset. Biochemical studies performed to assess the functional impact of the premature stop codon on catalytic activity. The variant was found to completely disrupt N-terminal acetyltransferase activity using an in vitro acetylation assay. Variant de novo, “in a gene sensitive to loss of heterozygosity”. Limitation of study - have not established whether this gene variant acts in a dominant or recessive manner. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5298 | TEFM |
Zornitza Stark gene: TEFM was added gene: TEFM was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: TEFM was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: TEFM were set to 36823193 Phenotypes for gene: TEFM were set to Combined oxidative phosphorylation deficiency 58, MIM# 620451 Review for gene: TEFM was set to GREEN Added comment: Seven individuals from 5 families reported. Presentation predominantly with encephalopathy, seizures and ID, in addition to lactic acidosis. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5282 | WBP4 |
Chirag Patel gene: WBP4 was added gene: WBP4 was added to Intellectual disability syndromic and non-syndromic. Sources: Other Mode of inheritance for gene: WBP4 was set to BIALLELIC, autosomal or pseudoautosomal Phenotypes for gene: WBP4 were set to Neurodevelopmental disorder Review for gene: WBP4 was set to GREEN gene: WBP4 was marked as current diagnostic Added comment: ESHG 2023: 11 individuals from 8 families with homozygous LOF variants in WBP4 gene (4 different variants). Presentation of severe DD and ID, hypotonia, abnormal outer ears, and varying congenital anomalies. WBP4 is spliceosome protein which binds/interacts with SNRNP200. In vivo and in vitro studies previously showed WBP4 enhances splicing and regulates alternative splicing. Patient fibroblasts showed loss of expression of WBP4. RNA sequencing analysis showed abnormal splicing patterns. Proposed spliceosomopathy. Sources: Other |
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| Intellectual disability syndromic and non-syndromic v0.5280 | KDM2A |
Chirag Patel gene: KDM2A was added gene: KDM2A was added to Intellectual disability syndromic and non-syndromic. Sources: Other Mode of inheritance for gene: KDM2A was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Phenotypes for gene: KDM2A were set to Neurodevelopmental disorder Review for gene: KDM2A was set to GREEN gene: KDM2A was marked as current diagnostic Added comment: ESHG 2023: 14 patients with de novo HTZ variants in KDM2A (5 x truncating, 9 x missense) Presentation with DD, ID (mild), seizures, growth retardation, and dysmorphism. Functional studies: -patient blood showed aberrant genome wide methylation profile - potential episignature -HEK293T cells showed altered subcellular localisation of KDM2A -Drosophila models showed variants caused neurotoxicity Sources: Other |
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| Intellectual disability syndromic and non-syndromic v0.5278 | PIP5K1C |
Chirag Patel gene: PIP5K1C was added gene: PIP5K1C was added to Intellectual disability syndromic and non-syndromic. Sources: Other Mode of inheritance for gene: PIP5K1C was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Phenotypes for gene: PIP5K1C were set to Neurodevelopmental disorder and microcephaly Review for gene: PIP5K1C was set to GREEN gene: PIP5K1C was marked as current diagnostic Added comment: ESHG 2023: 9 unrelated patients with de novo missense variants in PIP5K1C (3 x recurrent variants). Presentation with DD/ID (mod-profound), microcephaly, seizures, visual impairment, and dysmorphism. PIP5K1C is one of the phosphoinositolides, which control membrane composition of organelles and varying cellular processes. Patient fibroblasts showed increased PI(4,5)P2 levels, altered PI(4,5)P2 composition of early endosomes, and impaired endocytosis trafficking. Drosophila models showed microcephaly and ocular phenotype. Sources: Other |
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| Intellectual disability syndromic and non-syndromic v0.5271 | CYHR1 |
Chirag Patel gene: CYHR1 was added gene: CYHR1 was added to Intellectual disability syndromic and non-syndromic. Sources: Other Mode of inheritance for gene: CYHR1 was set to BIALLELIC, autosomal or pseudoautosomal Phenotypes for gene: CYHR1 were set to Neurodevelopmental disorder and microcephaly Review for gene: CYHR1 was set to AMBER gene: CYHR1 was marked as current diagnostic Added comment: ESHG 2023: 5 individuals from 3 families with biallelic LOF variants in CYHR1 (aka ZTRAF1). Presentation with microcephaly, hypotonia, DD, and ID. Expression studies showed mislocalisation of CYHR1. Mutant fibroblasts showed increased lysosomal markers and upregulated lysosomal proteins, leading to impaired autophagy. Zebrafish KO however did not show a phenotype. Sources: Other |
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| Intellectual disability syndromic and non-syndromic v0.5267 | KCNA3 |
Chirag Patel gene: KCNA3 was added gene: KCNA3 was added to Intellectual disability syndromic and non-syndromic. Sources: Other Mode of inheritance for gene: KCNA3 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Phenotypes for gene: KCNA3 were set to Neurodevelopmental disorder Review for gene: KCNA3 was set to GREEN gene: KCNA3 was marked as current diagnostic Added comment: ESHG 2023: 10 individuals with de novo missense variants in KCNA3 (K+ channel) Variable electrophysiology studies of effect of variants (5 x LOF, 4 x GOF, 1 no change) Presentation: abnormal speech development (8/8), ID (6/8), epilepsy (5/8), and ASD (7/8) Sources: Other |
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| Intellectual disability syndromic and non-syndromic v0.5265 | FSD1L |
Chirag Patel gene: FSD1L was added gene: FSD1L was added to Intellectual disability syndromic and non-syndromic. Sources: Other Mode of inheritance for gene: FSD1L was set to BIALLELIC, autosomal or pseudoautosomal Phenotypes for gene: FSD1L were set to Neurodevelopmental disorder Review for gene: FSD1L was set to GREEN gene: FSD1L was marked as current diagnostic Added comment: ESHG 2023: 8 families with biallelic missense/nonsense variants Presentation only described 1 family/2 affecteds with DD, ID, spastic paraparesis, epilepsy, corpus callosum hypoplasia, and optic nerve hypoplasia Functional assays: -reduced expression of FSD1L in mature neurons (RNA studies) -very low % mature neurons (neuronal differentiation) -reduced neuronal migration Sources: Other |
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| Intellectual disability syndromic and non-syndromic v0.5256 | ZMYM3 | Zornitza Stark reviewed gene: ZMYM3: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Intellectual developmental disorder, X-linked 112, MIM# 301111; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5251 | ERI1 |
Elena Savva gene: ERI1 was added gene: ERI1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: ERI1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: ERI1 were set to 37352860 Phenotypes for gene: ERI1 were set to Intellectual disability (MONDO#0001071), ERI1-related Review for gene: ERI1 was set to GREEN Added comment: PMID: 37352860 - 8 individuals from 7 unrelated families - Patients with biallelic missense show a MORE severe spondyloepimetaphyseal dysplasia, syndactyly, brachydactyly/clinodactyly/camptodactyly - Patients with biallelic null/whole gene deletion had mild ID and digit anomalies including brachydactyly/clinodactyly/camptodactyly - Patient chet for a missense and PTC variant has a blended phenotype with short stature, syndactyly, brachydactyly/clinodactyly/camptodactyly, mild ID and failure to thrive - Missense variants were functionally shown to not be able to rescue 5.8S rRNA processing in KO HeLa cells - K/O mice had neonatal lethality with growth defects, brachydactyly. Skeletal-specific K/O had mild platyspondyly, had more in keeping with patients with null variants than missense More severe phenotype hypothesised due to "exonuclease-dead proteins may compete for the target RNA molecules with other exonucleases that have functional redundancy with ERI1, staying bound to those RNA molecules" Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5250 | DRG1 |
Dean Phelan gene: DRG1 was added gene: DRG1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: DRG1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: DRG1 were set to PMID: 37179472 Phenotypes for gene: DRG1 were set to Neurodevelopmental disorder (MONDO:0700092), DRG1-related Review for gene: DRG1 was set to GREEN Added comment: PMID: 37179472 - Biallelic variants were identified in four affected individuals from three distinct families with neurodevelopmental disorder with global developmental delay, primary microcephaly, short stature and craniofacial anomalies. Functional studies show the variants result in a loss of function. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5234 | POU3F2 |
Sarah Pantaleo gene: POU3F2 was added gene: POU3F2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: POU3F2 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: POU3F2 were set to PMID: 37207645 Phenotypes for gene: POU3F2 were set to Autism spectrum disorder, NDD, and adolescent-onset obesity Penetrance for gene: POU3F2 were set to unknown Mode of pathogenicity for gene: POU3F2 was set to Other Review for gene: POU3F2 was set to GREEN Added comment: We associate ultra-rare variants in POU3F2, encoding a central nervous system transcription factor, with syndromic obesity and neurodevelopment delay in 12 individuals. Demonstrate variant pathogenicity through in vitro analysis. Used exome sequencing, GeneMatcher and Genomics England 100,000 Genomes Project rare disease database. Both truncating and missense variants in over 10 individuals sharing autism spectrum disorder, NDD, and adolescent-onset obesity (may have had other features eg. CAKUT in 2 individuals, diabetes in two) . Affected individuals presented with low-to-normal birth weight and infantile feeding difficulties but developed insulin resistance and hyperplasia during childhood. With the exception of an early truncating variant, the variants showed adequate nuclear translocation but overall disturbed DNA-binding ability and promoter activation. Variants absent from population and clinical databases. Almost all constituted putatively non-inherited de novo variants (8/10). Functional studies provide evidence for loss of function in eight and gain of function in one obesity-associated POU3F2 variant. One variant did not impact POU3F2-promoter activation, leaving the possibility for further path-mechanisms. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5234 | U2AF2 | Paul De Fazio edited their review of gene: U2AF2: Changed rating: GREEN; Changed phenotypes: Neurodevelopmental disorder, U2AF2-related (MONDO:0700092); Changed mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5230 | MCM6 |
Suliman Khan gene: MCM6 was added gene: MCM6 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: MCM6 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: MCM6 were set to PMID: 37198333 Phenotypes for gene: MCM6 were set to Neurodevelopmental disorder, MONDO:0700092, MCM6-related Review for gene: MCM6 was set to GREEN Added comment: PMID: 37198333 reported 5 unrelated families with de novo variants in MCM6 gene. Two patients with the same missense variant p.(Cys158Tyr) in zinc finger domain presented with intra-uterine growth retardation, short stature, congenital microcephaly, endocrine features, developmental delay and urogenital anomalies. In other three unrelated individuals different de novo missense variants were identified in the oligo nucleotide binding (OB)-fold domain. These patients had variable neurodevelopmental features including autism spectrum disorder, developmental delay, and epilepsy. The clinical features and functional defects related to the zinc binding residue resembled those observed in syndromes related to other MCM components and DNA replication factors (Meier–Gorlin syndrome and Seckel syndrome), while de novo OB-fold domain missense variants were associated with more variable neurodevelopmental phenotypes (PMID: 37198333). Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5226 | SLITRK2 | Zornitza Stark reviewed gene: SLITRK2: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Intellectual developmental disorder, X-linked 111, MIM# 301107; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5216 | SRSF1 | Paul De Fazio edited their review of gene: SRSF1: Changed mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5216 | POLR1A |
Elena Savva gene: POLR1A was added gene: POLR1A was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: POLR1A was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: POLR1A were set to PMID: 37075751 Phenotypes for gene: POLR1A were set to Acrofacial dysostosis, Cincinnati type MIM#616462 Review for gene: POLR1A was set to GREEN Added comment: PMID: 37075751 - >10 patients with developmental delay Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5198 | CRIPT |
Karina Sandoval commented on gene: CRIPT: PMID: 37013901 identified 6 individuals with Rothmund-Thomson syndrome characterised by poikiloderma, sparse hair, small stature, skeletal defects, cancer, cataracts, resembling features of premature aging. Two new variants identified and 4 were already published. 5 were hom, 1 was chet, all with different variants. All CRIPT individuals fulfilled the diagnostic criteria for RTS, and additionally had neurodevelopmental delay and seizures. CRIPT-deficient fibroblasts showed an unremarkable mitotic progression and unremarkable number of mitotic errors, c.132del p.(Ala45Glyfs*82), hom c.227G>A, p.(Cys76Tyr), hom c.133_134insGG,p.(Ala45Glyfs*82),hom c.141del p.(Phe47Leufs*84), hom c.8G>A p.(Cys3Tyr), 1,331 bp del exon 1, chet c.7_8del; p.(Cys3Argfs*4), hom |
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| Intellectual disability syndromic and non-syndromic v0.5198 | CRIPT |
Karina Sandoval gene: CRIPT was added gene: CRIPT was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: CRIPT was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: CRIPT were set to PMID: 37013901 Phenotypes for gene: CRIPT were set to Short stature with microcephaly and distinctive facies (MIM#615789) : Rothmund-Thomson syndrome MONDO:0010002 Review for gene: CRIPT was set to GREEN Added comment: Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5193 | SCN1B | Sangavi Sivagnanasundram reviewed gene: SCN1B: Rating: AMBER; Mode of pathogenicity: None; Publications: 9697698, 17020904, 12011299; Phenotypes: Generalized epilepsy with febrile seizures plus, type 1 (MONDO:0018214, MIM 604233); Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5184 | YWHAZ |
Achchuthan Shanmugasundram gene: YWHAZ was added gene: YWHAZ was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: YWHAZ was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: YWHAZ were set to 36001342 Phenotypes for gene: YWHAZ were set to Intellectual disability, MONDO:0001071 Review for gene: YWHAZ was set to RED Added comment: PMID:36001342 reported one large three-generation family with intellectual disability and global developmental delay, where all affected members were identified with a heterozygous missense variant (c.147A>T/ p.Lys49Asn) in YWHAZ gene. Although there were 10 other rare variants located in 10 genes (ARHGAP4, AGPS, APOL3, CES3, DACT2, ECH1, FAM71E2, KREMEN1, YWHAZ, ZFYVE26) that co-segregated with the ID/GDD phenotype were identified in the family, they were either not present in all affected members or present in unaffected members. In addition, computational modeling and knockdown/ knockin studies with Drosophila also confirmed the role of this YWHAZ variant in intellectual disability. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5183 | RRAS2 |
Elena Savva gene: RRAS2 was added gene: RRAS2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: RRAS2 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: RRAS2 were set to PMID: 31130282; 31130285 Phenotypes for gene: RRAS2 were set to Noonan syndrome 12 MIM#618624 Mode of pathogenicity for gene: RRAS2 was set to Loss-of-function variants (as defined in pop up message) DO NOT cause this phenotype - please provide details in the comments Review for gene: RRAS2 was set to AMBER Added comment: Gene has an established GOF mechanism PMID: 31130282 - 3/9 individuals had mild learning difficulties or mild GDD PMID: 31130285 - 1/3 individuals had mild ID, 1/3 had severe ID, 1/3 normal Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5182 | RBSN |
Achchuthan Shanmugasundram gene: RBSN was added gene: RBSN was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: RBSN was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: RBSN were set to 25233840; 29784638; 35652444 Phenotypes for gene: RBSN were set to intellectual disability, MONDO:0001071 Review for gene: RBSN was set to GREEN Added comment: This gene should be rated GREEN as bi-allelic variants in RBSN has been associated with a phenotype encompassing developmental delay and intellectual disability from four unrelated families. PMID:25233840 reported a 6.5 year old female patient with a homozygous missense variant c.1273G > A (p.Gly425Arg) and her clinical presentation included intractable seizures, developmental delay, microcephaly, dysostosis, osteopenia, craniofacial dysmorphism, macrocytosis and megaloblastoid erythropoiesis. PMID:29784638 reported three siblings with homozygous variant c.289G>C (p.Gly97Arg) in RBSN. The proband presented global developmental delay, had complete 46,XY male-to-female sex reversal and died at age 20 months after multiple infections. The other 2 affected siblings underwent unrelated-donor bone marrow or stem cell transplantation at 8 and 6.5 months of age, respectively. Both have severe intellectual disability and are nonambulatory and nonverbal. PMID:35652444 reported two unrelated families (three siblings from a family of Iranian descent identified with homozygous variant c.547G>A (p.Gly183Arg) and four members from a family of indigenous Cree descent identified with homozygous variant c.538C>G (p.Arg180Gly)) with overlapping phenotypes including developmental delay, intellectual disability, distal motor axonal neuropathy and facial dysmorphism. This gene has not yet been associated with any phenotypes either in OMIM or in Gene2Phenotype. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5182 | DPYSL2 |
Achchuthan Shanmugasundram gene: DPYSL2 was added gene: DPYSL2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: DPYSL2 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: DPYSL2 were set to 27249678; 35861646 Phenotypes for gene: DPYSL2 were set to intellectual disability, MONDO:0001071; Aplasia/Hypoplasia of the corpus callosum, HP:0007370 Review for gene: DPYSL2 was set to AMBER Added comment: This gene should be rated AMBER, as it has been associated with intellectual disability (ID) from two unrelated cases displaying monoallelic variants in DPYSL2/ CRMP2, and supported by functional studies. However, the evidence is not sufficient for green rating as there are variants reported in other (but different) genes in the two patients. PMID:35861646 reported two cases identified with heterozygous variants (patient1: c.1693C>T (p.Arg565Cys); patient 2: c.42C>A (p.Ser14Arg). These patients had overlapping phenotypes including dysmorphic features, severe global developmental delay and hypoplasia of the corpus callosum. In addition, patient 2 was bed-ridden and could not roll out and had a history of myoclonic seizures and status epilepticus. It should be noted that patient 1 is compound heterozygous for 2 missense variants in the EFCAB5 gene and was hemizygous for a maternally inherited missense variant in the GPKOW gene and patient 2 had 1 de novo missense variant in the COBLL1 gene and was compound heterozygous for 2 missense variants in the POTEF gene. The severity of the phenotypes between the two cases differs significantly and the additional variants may have possibly contributed to this phenotype. Brain-specific Crmp2 knockout mice display neuronal development deficits and behavioural impairments associated with hypoplasia of the corpus callosum. In addition, functional studies performed in zebrafish and cell lines that the CRMP2 variants lead to the loss-of-function of CRMP2 protein and can cause intellectual disability. This gene has not yet been associated with relevant phenotypes either in OMIM or in Gene2Phenotype. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5181 | AMOTL1 |
Lucy Spencer gene: AMOTL1 was added gene: AMOTL1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: AMOTL1 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: AMOTL1 were set to 36751037 Phenotypes for gene: AMOTL1 were set to Orofacial clefting syndrome, MONDO:0015335, AMOTL1-related Review for gene: AMOTL1 was set to GREEN Added comment: PMID: 36751037- 16 individuals from 12 families with orofacial clefting syndrome and het variants in AMOTL1. Many in 1 hotspot: 5 individuals from 3 families have R157C, 6 individuals from another 4 families have R157H, 1 has P160L, and another has Q161R. Out of this hostpaot- 1 with P368A, 1 with E507K, 1 with E579K. 7 are de novo. All but 2 have clefting, 7 are dysmorphic, 5 have hearing loss, 9 have CHD, 7 have tall stature, 6 have dev delay. Other features include liver disease, myopia, scoliosis and immune involvement. Another 2 families have been previously reported (described in the panelapp review in mendeliome) with variants in this hotspot 1 has 2 individuals with R157C, the other has 1 individual with P160L. All hotspot are absent from gnomad v2. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5173 | RAB39B | Zornitza Stark Mode of inheritance for gene: RAB39B was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5165 | RAB39B | Achchuthan Shanmugasundram reviewed gene: RAB39B: Rating: GREEN; Mode of pathogenicity: None; Publications: 20159109, 25434005, 11050621, 29152164, 32873259, 34761259; Phenotypes: Intellectual developmental disorder, X-linked 72, OMIM:300271, Waisman syndrome, OMIM:311510; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5158 | CCDC84 |
Lucy Spencer gene: CCDC84 was added gene: CCDC84 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: CCDC84 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: CCDC84 were set to 34009673 Phenotypes for gene: CCDC84 were set to Mosaic variegated aneuploidy syndrome 4 (MIM#620153) Review for gene: CCDC84 was set to AMBER Added comment: PMID: 34009673- patients with constitutional mosaic aneuploidy were found to have biallelic mutations in CENATAC(CCDC84). 2 adult siblings with mosaic aneuploidies, microcephaly, dev delay, and maculopathy. Both chet for a missense and a splice site deletion- but the paper days these both result in the creation of a novel splice site that leads to frameshifts and loss of the c-terminal 64 amino acids. Gene is shown to be part of a spliceosome. CENATAC depletion or expression of disease mutants resulted in retention of introns in ~100 genes enriched for nucleocytoplasmic transport and cell cycle regulation, and caused chromosome segregation errors. Functional analysis in CENATAC-depleted HeLa cells demonstrated chromosome congression defects and subsequent mitotic arrest, which could be fully rescued by wildtype but not mutant CENATAC. Expression of the MVA-associated mutants exacerbated the phenotype, suggesting that the mutant proteins dominantly repress the function of any residual wildtype protein. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5156 | TCEAL1 | Zornitza Stark reviewed gene: TCEAL1: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Neurodevelopmental disorder with gait disturbance, dysmorphic facies and behavioral abnormalities, X-linked, MIM# 301094; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5153 | SMC5 | Zornitza Stark Phenotypes for gene: SMC5 were changed from Multiple congenital anomalies/dysmorphic syndrome, MONDO:0019042, SLF2-related; Atelis syndrome; microcephaly; short stature; ID to Atelis syndrome 2, MIM# 620185 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5152 | SLF2 | Zornitza Stark Phenotypes for gene: SLF2 were changed from Multiple congenital anomalies/dysmorphic syndrome, MONDO:0019042, SLF2-related; Atelis syndrome; microcephaly; short stature; ID to Atelis syndrome 1, MIM# 620184 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5148 | TRPC5 |
Zornitza Stark gene: TRPC5 was added gene: TRPC5 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: TRPC5 was set to X-LINKED: hemizygous mutation in males, biallelic mutations in females Publications for gene: TRPC5 were set to 36323681; 24817631; 23033978; 33504798; 28191890 Phenotypes for gene: TRPC5 were set to Neurodevelopmental disorder, MONDO:0700092, TRPC5-related Review for gene: TRPC5 was set to AMBER Added comment: PMID: 36323681; Leitão E. et al. (2022) Nat Commun.13(1):6570: Missense variant NM_012471.2:c.523C>T, p.(Arg175Cys in three brothers with intellectual disability (ID) and autistic spectrum disorder (ASD), inherited from an asymptomatic mother and absent in the maternal grandparents. Whole cell patch clamp studies of HEK293 created by site-directed mutagenesis showed increased current of this calcium channel (constitutively opened). (This variant is absent in gnomAD v2.1.1). Also, the nonsense variant, c.965G> A, p.(Trp322*) was found in a high functioning ASD male (maternally inherited), NMD-predicted. Other papers and TRPC5 variants that were cited to associate this gene with X-linked ID and/or ASD include: PMID: 24817631; Mignon-Ravix, C. et al. (2014) Am. J.Med. Genet. A 164A: 1991–1997: A hemizygous 47-kb deletion in Xq23 including exon 1 of the TRPC5 gene. He had macrocephaly, delayed psychomotor development, speech delay, behavioural problems, and autistic features. Maternally inherited, and a family history compatible with X-linked inheritance (i.e., maternal great uncle was also affected, although not tested). In addition, PMID: 36323681; Leitão E. et al. (2022) cites papers with the variants p.(Pro667Thr), p.(Arg71Gln) and p.(Trp225*). NB. p.(Pro667Thr) is absent in gnomAD (v2.1.1), p.(Arg71Gln) is also absent (the alternative variant p.(Arg71Trp) is present once as heterozygous only). p.(Trp225*) is absent, and it should be noted that PTCs / LoF variants are very rare (pLI = 1). However, looking further into the three references, the evidence is not as clear or as accurate as was stated. The missense variant c.1999C>A, p.(Pro667Thr), was stated as de novo, but was actually maternally inherited but was still considered a candidate for severe intellectual disability (shown in the Appendix, Patient 93, with severe speech delay, autism spectrum disorder and Gilles de la Tourette). This patient also has a de novo MTF1 variant. Reference: PMID: 23033978; de Ligt, J. et al. (2012) N. Engl. J. Med. 367: 1921–1929). Missense variant (de novo): c.212G>A, p.(Arg71Gln), was found as part of the Deciphering Developmental Disorders (DDD) study and is shown in individual 164 in Supplementary Table 2 of PMID: 33504798; Martin, HC. et al. (2021) Nat. Commun.12: 627. Also displayed in DECIPHER (DDD research variant) with several phenotype traits, but ID and ASD are not specifically mentioned. Nonsense variant: c.674G>A. p.(Trp225*) was stated as de novo but was inherited (reference PMID: 28191890; Kosmicki, JA. et al. (2017) Nat. Genet. 49: 504–510. Supplement Table 7). This was a study of severe intellectual delay, developmental delay / autism. (NB. The de novo p.(Arg71Gln) variant from the DDD study is also listed (subject DDD 342 in Supplement 4 / Table 2). Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5144 | ZMYM3 | Zornitza Stark Mode of inheritance for gene: ZMYM3 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5138 | CDK16 | Belinda Chong reviewed gene: CDK16: Rating: GREEN; Mode of pathogenicity: None; Publications: 36323681, 31981491, 25644381; Phenotypes: Neurodevelopmental disorder (MONDO#0700092) CDK16-related; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5134 | TRA2B |
Elena Savva gene: TRA2B was added gene: TRA2B was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: TRA2B was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: TRA2B were set to PMID: 36549593 Phenotypes for gene: TRA2B were set to Neurodevelopmental disorder, TRA2B-related (MONDO#0700092) Review for gene: TRA2B was set to GREEN Added comment: PMID: 36549593 - 12 individuals with ID and dev delay. Additional features include infantile spams 6/12, hypotonia 12/12, dilated brain ventricles 6/12, microcephaly 5/12 - All variants result in the loss of 1/2 transcripts (start-losses or PTCs upstream of a second translation start position). Shorter transcript expression is increased, longer transcript expression is decreased. - Apparently het mice K/O are normal, but complete K/O cannot develop embryonically. - DN mechanism suggested Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5133 | ZMYM3 | Belinda Chong reviewed gene: ZMYM3: Rating: GREEN; Mode of pathogenicity: None; Publications: 36586412, 24721225; Phenotypes: Neurodevelopmental disorders (NDDs); Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5127 | SETD2 |
Zornitza Stark edited their review of gene: SETD2: Added comment: PMID 32710489: 12 unrelated patients, ranging from 1 month to 12 years of age, with a multisystemic neurodevelopmental disorder associated with a specific de novo heterozygous mutation in the SETD2 gene (R1740W). Key clinical features: severely impaired global development apparent from infancy, feeding difficulties with failure to thrive, small head circumference, and dysmorphic facial features. Affected individuals have impaired intellectual development and hypotonia; they do not achieve walking or meaningful speech. Other neurologic findings may include seizures, hearing loss, ophthalmologic defects, and brain imaging abnormalities. There is variable involvement of other organ systems, including skeletal, genitourinary, cardiac, and possibly endocrine. Further 3 unrelated patients identified with mild to moderately impaired intellectual development associated with a specific de novo heterozygous mutation in the SETD2 gene (R1740Q). These are distinct clinically from Luscan-Lumish syndrome, which is characterised by overgrowth.; Changed publications: 29681085, 32710489; Changed phenotypes: Luscan-Lumish syndrome, MIM#616831, Rabin-Pappas syndrome,MIM# 620155, Intellectual developmental disorder, autosomal dominant 70, MIM# 620157 |
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| Intellectual disability syndromic and non-syndromic v0.5115 | AMER1 | Zornitza Stark Mode of inheritance for gene: AMER1 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5079 | NLGN4X | Krithika Murali reviewed gene: NLGN4X: Rating: GREEN; Mode of pathogenicity: None; Publications: PMID:26350204, PMID:14963808, PMID:12669065, PMID:23352163, PMID:28263302, PMID:16648374; Phenotypes: Intellectual developmental disorder, X-linked - MIM#300495; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5079 | ELP2 |
Renee Crooks changed review comment from: Phenotype of Intellectual Disability has been observed in the PMIDs listed above in the following forms; -spastic diplegia -cortico-cerebullar -nodular heterotopia -epilepsy -severe motor development delay -short stature -neuropsychiatric problems -choreoathetosis -nystagmus; to: Phenotype of Intellectual Disability has been observed in the PMIDs listed above in the following forms; -spastic diplegia -cortico-cerebullar -nodular heterotopia -epilepsy -severe motor development delay -short stature -neuropsychiatric problems -choreoathetosis -nystagmus NB - review submit by Renée Crooks ( aka using google account as Lee Ren) |
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| Intellectual disability syndromic and non-syndromic v0.5079 | AMER1 | Deepak Subramanian reviewed gene: AMER1: Rating: GREEN; Mode of pathogenicity: None; Publications: PMID: 19079258, 22987541, 23401208, 28497491, 32879452, 35186393, 20950377, 22043478; Phenotypes: Osteopathia striata with cranial sclerosis, OMIM:300373, Osteopathia striata-cranial sclerosis syndrome, ORPHA:2780, Intellectual disability, HP:0001249; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5076 | BCKDK |
Zornitza Stark changed review comment from: At least 5 unrelated families reported. ID if untreated. Treatment available.; to: At least 5 unrelated families reported. ID/autism/seizures are part of the phenotype. Treatment available: Branched-chain amino acid supplementation: improves psychomotor/cognitive development/IQ; improves behavioural/psychiatric disturbance(s); improves systemic manifestations |
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| Intellectual disability syndromic and non-syndromic v0.5060 | CBS |
Lloyd Pereira changed review comment from: Listed in OMIM with a strong disease association (MIM #236200 homocysteinuria). Multiple experimental and clinical studies demonstrate link between CBS and homocysteinuria (see below): Multiple LOF variants classified as pathogenic or likely pathogenic in ClinVar and reported in the literature in multiple homozygote and compound heterozygote individuals affected with homocystinuria, e.g. c.19dup p.(Gln7fs) (PMID: 25218699; 12124992) and c.919G>A p.(Gly307Ser) (PMID: 7506602, 7581402, 8744616, 9889017, 23733603). Multiple CBS variants reported in CBS deficiency (PMID: 12124992). ClinGen classify as definitive for Homocysteinuria. Clingen states- Twenty-one unique variants were curated (missense, nonsense, frameshift, and splice site) in 15 probands from 8 publications, and three of these probands each had two affected siblings in whom CBS variants were identified (PMID 1301198, 10408774, 7762555, 12815602, 16307898, 25455305, 26667307, 29508359). Gene-disease relationship is supported by the biochemical function of CBS, which is consistent with the biochemical features in patients with homocystinuria (including elevated plasma total homocysteine and methionine) (PMID 13654400, 15890029), functional studies in yeast, bacteria, and cultured cells, including chaperone studies in fibroblasts from patients with homocystinuria (PMID 9590298, 25331909), as well as the biochemical and clinical features of mouse models (PMID 18987302) and enzyme replacement studies in mice (PMID 29398487). Recent review reports on role of CBS in down syndrome (PMID: 31955501). However, caveat that multiple genes are associated with down syndrome. Not a strong body of research available linking CBS variants and down syndrome.; to: Listed in OMIM with a strong disease association (MIM #236200 homocysteinuria). Multiple experimental and clinical studies demonstrate link between CBS and homocysteinuria (see below): Multiple LOF variants classified as pathogenic or likely pathogenic in ClinVar and reported in the literature in multiple homozygote and compound heterozygote individuals affected with homocystinuria, e.g. c.19dup p.(Gln7fs) (PMID: 25218699; 12124992) and c.919G>A p.(Gly307Ser) (PMID: 7506602, 7581402, 8744616, 9889017, 23733603). Multiple CBS variants reported in CBS deficiency (PMID: 12124992). ClinGen classify as definitive for Homocysteinuria. Clingen states- Twenty-one unique variants were curated (missense, nonsense, frameshift, and splice site) in 15 probands from 8 publications, and three of these probands each had two affected siblings in whom CBS variants were identified (PMID 1301198, 10408774, 7762555, 12815602, 16307898, 25455305, 26667307, 29508359). Gene-disease relationship is supported by the biochemical function of CBS, which is consistent with the biochemical features in patients with homocystinuria (including elevated plasma total homocysteine and methionine) (PMID 13654400, 15890029), functional studies in yeast, bacteria, and cultured cells, including chaperone studies in fibroblasts from patients with homocystinuria (PMID 9590298, 25331909), as well as the biochemical and clinical features of mouse models (PMID 18987302) and enzyme replacement studies in mice (PMID 29398487). Recent review reports on role of CBS in down syndrome (PMID: 31955501). However, caveat that multiple genes are associated with down syndrome. Not a strong body of research available linking CBS variants and down syndrome. |
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| Intellectual disability syndromic and non-syndromic v0.5053 | TCEAL1 |
Melanie Marty gene: TCEAL1 was added gene: TCEAL1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: TCEAL1 was set to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) Publications for gene: TCEAL1 were set to PMID: 36368327 Phenotypes for gene: TCEAL1 were set to hypotonia; abnormal gait; developmental delay; intellectual disability; autism; dysmorphic facial features. Review for gene: TCEAL1 was set to GREEN Added comment: 7 individuals (males and females) with de novo variants involving TCEAL1 with an X-linked dominant neurodevelopmental syndrome. Individuals had hypotonia, abnormal gait, developmental delay/intellectual disability especially affecting expressive language, autistic-like behavior, and mildly dysmorphic facial features. Additional features included strabismus, refractive errors, variable nystagmus, gastroesophageal reflux, constipation, dysmotility, recurrent infections, seizures, and structural brain anomalies. 1 additional male individual with a maternally inherited missense variant (unaffected mother), which was considered a VUS. This individual had hypertonia and spasticity without syndromic features. 4 PTCs, 2 CNVs, 2 missense reported. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5053 | GABRA3 |
Sarah Pantaleo gene: GABRA3 was added gene: GABRA3 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: GABRA3 was set to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) Publications for gene: GABRA3 were set to PMID: 29053855 Phenotypes for gene: GABRA3 were set to Epilepsy, intellectual disability, dysmorphic features, Penetrance for gene: GABRA3 were set to Incomplete Review for gene: GABRA3 was set to GREEN Added comment: Six variants in GABRA3 encoding the alpha3-subunit of the GABA(A) receptor. Five missense variants and one micro duplication were detected in four families and two sporadic cases presenting with a range of epileptic seizure types, a varying degree of intellectual disability and developmental delay, sometimes with dysmorphic features or nystagmus. The variants co-segregated mostly but not completely with the phenotype in the families, indicating in some cases incomplete penetrance, involvement of other genes, or presence of phenocopies. Overall, males were more severely affected and there were three asymptomatic female mutation carriers compared to only one male without a clinical phenotype. Mechanism suggested - three detected missense variants are localised in the extracellular GABA-binding NH2-terminus, one in the M2-M3 linker and one in the M4 transmembrane segment of the alpha3-subunit. Functional studies in Xenopus leaves oocytes revealed a variable but significant reduction of GABA-evoked anion currents for all mutants compared to wild-type receptors. The degree of current reduction correlated partially with the phenotype. Results reveal that rare loss-of-function variants in GABRA3 increase the risk for a varying combination of epilepsy, intellectual disability/developmental delay and dysmorphic features, presenting in some pedigrees with an X-linked inheritance pattern. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5052 | FEM1C |
Paul De Fazio gene: FEM1C was added gene: FEM1C was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: FEM1C was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: FEM1C were set to 36336956; 28135719; 33398170; 33398168 Phenotypes for gene: FEM1C were set to Neurodevelopmental disorder, FEM1C-related MONDO:0700092 Review for gene: FEM1C was set to GREEN gene: FEM1C was marked as current diagnostic Added comment: PMID:36336956 describes a 9-year-old boy with severe DD, lack of speech, pyramidal signs, and limb ataxia who had a de novo missense variant Asp126His in FEM1C ascertained by WES. The equivalent variant introduced into the nematode C.elegans resulted in disabled locomotion caused by synaptic abnormalities and not muscle dysfunction. An alternate change Asp126Val was reported in the DDD study de novo in a patient with uncharacterised developmental delay (PMID:28135719). The Asp126 residue (but not either of the variants above specifically) was shown to be functionally important by in vitro studies (PMID:33398170;33398168). The residue is highly conserved and located in a region of missense constraint. Borderline green, 2 patients and an animal model. Note all evidence points to the Asp126 residue being of specific importance. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5040 | EXOSC3 |
Michelle Dang changed review comment from: Association with global developmental delay, hypotonia, hyperreflexia, cerebellar (+/- pontine) atrophy with variable severity. Assessment of cognitive function/IQ limited by motor and speech impairments. Severe forms associated with early deaths during infancy periods. Intellectual impairment/psychomotor retardation (to varying degrees) reported in all cases across varying degrees of severity (23284067). Zanni et al (23975261) identified 2 individuals with compound heterozygous mutations resulting in intellectual impairment and early onset spasticity. Wan et al (22544365) described global developmental delay in addition to cerebellar features and spinal motor degeneration.; to: Association with global developmental delay, hypotonia, hyperreflexia, cerebellar (+/- pontine) atrophy with variable severity. Assessment of cognitive function/IQ limited by motor and speech impairments. Severe forms associated with early deaths during infancy periods. Intellectual impairment/psychomotor retardation (to varying degrees) reported in all cases across varying degrees of severity (23284067). Zanni et al (23975261) identified 2 individuals with compound heterozygous mutations resulting in intellectual impairment and early onset spasticity. Wan et al (22544365) described global developmental delay in addition to cerebellar features and spinal motor degeneration, with functional effects of the mutation reproduced with knocked down endogenous expression of exosc3 in zebrafish embryos and subsequent rescue of the phenotype by co-injection with wild-type zebrafish exosc3 mRNA. |
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| Intellectual disability syndromic and non-syndromic v0.5040 | EXOSC3 | Michelle Dang changed review comment from: Association with global developmental delay, hypotonia, hyperreflexia, cerebellar (+/- pontine) atrophy with variable severity. Assessment of cognitive function/IQ limited by motor and speech impairments. Severe forms associated with early deaths during infancy periods. Intellectual impairment/psychomotor retardation (to varying degrees) reported in all cases across various severity (23284067). Zanni et al (23975261) identified 2 individuals with compound heterozygous mutations resulting in intellectual impairment and early onset spasticity. Wan et al (22544365) described global developmental delay in addition to cerebellar features and spinal motor degeneration.; to: Association with global developmental delay, hypotonia, hyperreflexia, cerebellar (+/- pontine) atrophy with variable severity. Assessment of cognitive function/IQ limited by motor and speech impairments. Severe forms associated with early deaths during infancy periods. Intellectual impairment/psychomotor retardation (to varying degrees) reported in all cases across varying degrees of severity (23284067). Zanni et al (23975261) identified 2 individuals with compound heterozygous mutations resulting in intellectual impairment and early onset spasticity. Wan et al (22544365) described global developmental delay in addition to cerebellar features and spinal motor degeneration. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5040 | EXOSC3 | Michelle Dang edited their review of gene: EXOSC3: Added comment: Association with global developmental delay, hypotonia, hyperreflexia, cerebellar (+/- pontine) atrophy with variable severity. Assessment of cognitive function/IQ limited by motor and speech impairments. Severe forms associated with early deaths during infancy periods. Intellectual impairment/psychomotor retardation (to varying degrees) reported in all cases across various severity (23284067). Zanni et al (23975261) identified 2 individuals with compound heterozygous mutations resulting in intellectual impairment and early onset spasticity. Wan et al (22544365) described global developmental delay in addition to cerebellar features and spinal motor degeneration.; Changed phenotypes: Cerebellar atrophy, Developmental delay, Lower motor neuron degeneration, Upper motor neuron features, Spasticity/hyperreflexia (+/-) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5040 | EXOSC3 | Michelle Dang changed review comment from: Association with global developmental delay, hypotonia, hyperreflexia, cerebellar (+/- pontine) atrophy. Variable severity. Assessment of cognitive function/IQ limited by motor and speech impairments. Severe forms associated with early deaths during infancy periods. Intellectual impairment (to varying degrees) reported in all cases across various severity.; to: Association with global developmental delay, hypotonia, hyperreflexia, cerebellar (+/- pontine) atrophy with variable severity. Assessment of cognitive function/IQ limited by motor and speech impairments. Severe forms associated with early deaths during infancy periods. Intellectual impairment/psychomotor retardation (to varying degrees) reported in all cases across various severity (23284067). Zanni et al (23975261) identified 2 individuals with compound heterozygous mutations resulting in intellectual impairment and early onset spasticity. Wan et al (22544365) described global developmental delay in addition to cerebellar features and spinal motor degeneration. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5031 | KIF26A |
Chirag Patel gene: KIF26A was added gene: KIF26A was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: KIF26A was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: KIF26A were set to PMID: 36228617 Phenotypes for gene: KIF26A were set to Congenital brain malformations, no OMIM # Review for gene: KIF26A was set to GREEN Added comment: 5 unrelated patients with biallelic loss-of-function variants in KIF26A (found through WES), exhibiting a spectrum of congenital brain malformations (schizencephaly, corpus callosum anomalies, polymicrgyria, and ventriculomegaly). Combining mice and human iPSC-derived organoid models, they discovered that loss of KIF26A causes excitatory neuron-specific defects in radial migration, localization, dendritic and axonal growth, and apoptosis, offering a convincing explanation of the disease etiology in patients. Single-cell RNA sequencing in KIF26A knockout organoids revealed transcriptional changes in MAPK, MYC, and E2F pathways. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5025 | TPR |
Zornitza Stark gene: TPR was added gene: TPR was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: TPR was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: TPR were set to 34494102 Phenotypes for gene: TPR were set to Multiple congenital anomalies/dysmorphic syndrome, MONDO:0019042, TPR-related Review for gene: TPR was set to RED Added comment: Two siblings harbouring variants c.6625C>T/ p.Arg2209Ter (identified in heterozygous state in both siblings and father) and c.2610 + 5G > A (identified in heterozygous state in both siblings and mother) were reported with ataxia, microcephaly and severe intellectual disability. Functional analyses in patient fibroblasts provide evidence that the variants affect TPR splicing, reduce steady-state TPR levels, abnormal nuclear pore composition and density, and altered global RNA distribution. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5023 | SMC5 |
Zornitza Stark gene: SMC5 was added gene: SMC5 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: SMC5 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: SMC5 were set to 36333305 Phenotypes for gene: SMC5 were set to Multiple congenital anomalies/dysmorphic syndrome, MONDO:0019042, SLF2-related; Atelis syndrome; microcephaly; short stature; ID Review for gene: SMC5 was set to GREEN Added comment: Four individuals from three families with a chromosome breakage disorder and bi-allelic variants in this gene. However, three of the individuals had the same homozygous missense variant. Evidence for functional impact of the variant was limited. However, zebrafish model recapitulated the phenotype and was not rescued by the introduction of this variant, arguing for functional effect. Borderline Amber/Green. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5021 | SLF2 |
Zornitza Stark gene: SLF2 was added gene: SLF2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: SLF2 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: SLF2 were set to 36333305 Phenotypes for gene: SLF2 were set to Multiple congenital anomalies/dysmorphic syndrome, MONDO:0019042, SLF2-related; Atelis syndrome; microcephaly; short stature; ID Review for gene: SLF2 was set to GREEN Added comment: Seven individuals from 6 families with a chromosome breakage disorder and bi-allelic variants in this gene (LoF). Functional data including zebrafish model. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5013 | PI4K2A |
Seb Lunke gene: PI4K2A was added gene: PI4K2A was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: PI4K2A was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: PI4K2A were set to 30564627; 35880319; 19581584 Phenotypes for gene: PI4K2A were set to complex neurodevelopmental disorder with motor features, PI4K2A-related, MONDO:0100516 Review for gene: PI4K2A was set to GREEN Added comment: Two reportedly unrelated, consanguine families with the same hom stop mutation in PI4K2A, p.(Arg309Ter). Probands with seizures, developmental delay, hypotonia/dystonia, myoclonus and developmental delay. MRI showed extensive brain abnormalities including dysgenesis of the corpus callosum, ventriculomegaly, and white matter volume loss. Functional studies showed cellular mislocalisation of the Arg309Ter truncated protein construct compared to WT and an missense control. An earlier paper from 2018 described two additional probands with a different stop mutation, p.(Ser22Ter), and overlapping phenotypic presentation. in 2011, a Pi4k2a knock-out mouse model was described. "Knock-out animals initially appeared normal but later develop a progressive neurological dis-ease characterized by tremor, limb weakness, urinary incontinence and premature mortality. Histological analysis revealed massive axonal degeneration in the spinal cord in the descending corticospinal tracts." Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5006 | OTC | Zornitza Stark Mode of inheritance for gene: OTC was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5005 | OTC | Zornitza Stark reviewed gene: OTC: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Ornithine transcarbamylase deficiency, MIM#311250; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4995 | HEATR3 | Zornitza Stark Phenotypes for gene: HEATR3 were changed from Bone marrow failure, short stature, facial and acromelic dysmorphic features, and mild intellectual disability; Diamond Blackfan anaemia MONDO:0015253, HEATR3 related to Bone marrow failure, short stature, facial and acromelic dysmorphic features, and mild intellectual disability; Diamond-Blackfan anaemia 21, MIM# 620072 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4991 | FRMD5 |
Zornitza Stark gene: FRMD5 was added gene: FRMD5 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: FRMD5 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Review for gene: FRMD5 was set to GREEN Added comment: Eight individuals reported with missense variants in this gene, de novo in 6 where parents were available. Clinical presentation was with ID, seizures, ataxia. Fly model. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4988 | GIGYF1 | Elena Savva reviewed gene: GIGYF1: Rating: GREEN; Mode of pathogenicity: None; Publications: PMID: 35917186; Phenotypes: Autism, Intellectual disability, GIGYF1-related (MONDO#0001071); Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4987 | HECW2 |
Zornitza Stark changed review comment from: Two probands reported with biallelic variants and putative loss of function mechanism of disease (compared to the established gain of function monoallelic disease) PMID: 35753050 - Caucasian girl who presented a severe neurodevelopmental disorder with drug-resistant epilepsy, hypotonia, severe gastro-esophageal reflux and brain magnetic resonance imaging anomalies with a homozygous splice variant that causes in-frame elimination of exon 22 (c.3917+2_3917+12delinsG r.3766_3917+1del p.Leu1256_Trp1306del). Protein expression level was reduced by 60%, suggesting a partial loss-of-function mechanism of disease. PMID: 35487419 - homozygous nonsense variant (c.736C>T; p.Arg246*) identified in a proband from a Moroccan consanguineous family, with developmental delay, intellectual disability, hypotonia, generalized tonico-clonic seizures and a persistent tilted head.; to: Two probands reported with biallelic variants and putative loss of function mechanism of disease (compared to the established gain of function monoallelic disease) PMID: 35753050 - Caucasian girl who presented a severe neurodevelopmental disorder with drug-resistant epilepsy, hypotonia, severe gastro-esophageal reflux and brain magnetic resonance imaging anomalies with a homozygous splice variant that causes in-frame elimination of exon 22 (c.3917+2_3917+12delinsG r.3766_3917+1del p.Leu1256_Trp1306del). Protein expression level was reduced by 60%, suggesting a partial loss-of-function mechanism of disease. PMID: 35487419 - homozygous nonsense variant (c.736C>T; p.Arg246*) identified in a proband from a Moroccan consanguineous family, with developmental delay, intellectual disability, hypotonia, generalized tonico-clonic seizures and a persistent tilted head. Association with bi-allelic variants is AMBER. |
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| Intellectual disability syndromic and non-syndromic v0.4987 | HECW2 |
Zornitza Stark edited their review of gene: HECW2: Added comment: Two probands reported with biallelic variants and putative loss of function mechanism of disease (compared to the established gain of function monoallelic disease) PMID: 35753050 - Caucasian girl who presented a severe neurodevelopmental disorder with drug-resistant epilepsy, hypotonia, severe gastro-esophageal reflux and brain magnetic resonance imaging anomalies with a homozygous splice variant that causes in-frame elimination of exon 22 (c.3917+2_3917+12delinsG r.3766_3917+1del p.Leu1256_Trp1306del). Protein expression level was reduced by 60%, suggesting a partial loss-of-function mechanism of disease. PMID: 35487419 - homozygous nonsense variant (c.736C>T; p.Arg246*) identified in a proband from a Moroccan consanguineous family, with developmental delay, intellectual disability, hypotonia, generalized tonico-clonic seizures and a persistent tilted head.; Changed publications: 29807643, 29395664, 27334371, 27389779, 35753050, 35487419; Changed mode of inheritance: BOTH monoallelic and biallelic, autosomal or pseudoautosomal |
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| Intellectual disability syndromic and non-syndromic v0.4986 | DPH5 |
Zornitza Stark gene: DPH5 was added gene: DPH5 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: DPH5 was set to BIALLELIC, autosomal or pseudoautosomal Phenotypes for gene: DPH5 were set to Neurodevelopmental disorder with short stature, prominent forehead, and feeding difficulties 620070 Review for gene: DPH5 was set to GREEN Added comment: 5 individuals from 3 unrelated families reported with severe ID, feeding difficulties, dysmorphic features and congenital anomalies, though there was no consistent pattern to these. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4984 | ADGRL1 | Zornitza Stark Mode of inheritance for gene: ADGRL1 was changed from MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4983 | BRIP1 | Zornitza Stark Phenotypes for gene: BRIP1 were changed from to Fanconi anaemia, complementation group J, MIM# 609054 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4974 | LETM1 |
Ee Ming Wong gene: LETM1 was added gene: LETM1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: LETM1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: LETM1 were set to 36055214 Phenotypes for gene: LETM1 were set to Mitochondrial disease MONDO#0044970, LETM1-related Review for gene: LETM1 was set to GREEN gene: LETM1 was marked as current diagnostic Added comment: -18 affected individuals from 11 unrelated families harbouring ultra-rare bi-allelic missense and loss-of-function LETM1 variants -Most of the affected individuals (14/18, 78%) had an infantile-onset disease manifestation, and 4/18 (22%) presented first symptoms between the ages of 1.5 and 2 years -Variant types included missense, frameshift, stop loss, in-frame deletion and splice defect -From biochemical and morphological studies, bi-allelic LETM1 variants are associated with defective mitochondrial K efflux, swollen mitochondrial matrix structures, and loss of important mitochondrial oxidative phosphorylation protein components Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4968 | SLC32A1 |
Lucy Spencer gene: SLC32A1 was added gene: SLC32A1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: SLC32A1 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: SLC32A1 were set to 36073542 Phenotypes for gene: SLC32A1 were set to developmental and epileptic encephalopathy MONDO:0100062, SLC32A1-related Review for gene: SLC32A1 was set to GREEN Added comment: PMID: 36073542- 4 patients with de novo missense. All have moderate to severe ID or developmental delay and seizures. 3 have a movement disorder. Developmental delay appears to be a new association for this gene described in this paper. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4958 | DPH2 | Zornitza Stark Phenotypes for gene: DPH2 were changed from Diphthamide-deficiency syndrome to Developmental delay with short stature, dysmorphic facial features, and sparse hair 2, MIM# 620062; Diphthamide-deficiency syndrome | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4957 | DPH2 | Zornitza Stark reviewed gene: DPH2: Rating: AMBER; Mode of pathogenicity: None; Publications: ; Phenotypes: Developmental delay with short stature, dysmorphic facial features, and sparse hair 2, MIM# 620062; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4955 | TAT | Zornitza Stark Tag treatable tag was added to gene: TAT. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4948 | ATP7A | Zornitza Stark Mode of inheritance for gene: ATP7A was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4947 | ATP7A | Zornitza Stark reviewed gene: ATP7A: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Menkes disease MIM#309400; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4936 | PPP2R5C | Teresa Zhao reviewed gene: PPP2R5C: Rating: GREEN; Mode of pathogenicity: Other; Publications: PMID: 25972378; Phenotypes: Neurodevelopmental disorder, PPP2R5C-related (MONDO:070092); Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4934 | TRAPPC10 | Zornitza Stark Phenotypes for gene: TRAPPC10 were changed from neurodevelopmental disorder (MONDO:0700092), TRAPPC10-related to Neurodevelopmental disorder with microcephaly, short stature, and speech delay, MIM# 620027 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4933 | TRAPPC10 | Zornitza Stark reviewed gene: TRAPPC10: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Neurodevelopmental disorder with microcephaly, short stature, and speech delay, MIM# 620027; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4932 | UBAP2L | Zornitza Stark Phenotypes for gene: UBAP2L were changed from Delayed speech and language development; Motor delay; Intellectual disability; Autistic behavior; Seizures; Microcephaly; Abnormality of head or neck; Short stature; Abnormality of the skeletal system to Neurodevelopmental disorder, MONDO:0700092, UBAP2L-related; Delayed speech and language development; Motor delay; Intellectual disability; Autistic behavior; Seizures; Microcephaly; Abnormality of head or neck; Short stature; Abnormality of the skeletal system | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4931 | UBAP2L | Zornitza Stark Mode of inheritance for gene: UBAP2L was changed from MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4929 | CHKA | Zornitza Stark Phenotypes for gene: CHKA were changed from Neurodevelopmental disorder, MONDO:0700092; Abnormal muscle tone; Global developmental delay; Intellectual disability; Seizures; Microcephaly; Abnormality of movement; Abnormality of nervous system morphology; Short stature to Neurodevelopmental disorder with microcephaly, movement abnormalities, and seizures, MIM#620023 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4928 | CAPRIN1 | Konstantinos Varvagiannis reviewed gene: CAPRIN1: Rating: GREEN; Mode of pathogenicity: None; Publications: 35979925, 35977029, 28135719, 31398340, https://doi.org/10.1101/2021.12.20.21267194; Phenotypes: Global developmental delay, Delayed speech and language development, Intellectual disability, Autistic behavior, Seizures; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4928 | UBAP2L |
Konstantinos Varvagiannis gene: UBAP2L was added gene: UBAP2L was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: UBAP2L was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: UBAP2L were set to 35977029 Phenotypes for gene: UBAP2L were set to Delayed speech and language development; Motor delay; Intellectual disability; Autistic behavior; Seizures; Microcephaly; Abnormality of head or neck; Short stature; Abnormality of the skeletal system Penetrance for gene: UBAP2L were set to unknown Review for gene: UBAP2L was set to GREEN Added comment: Based on Jia et al (2022 - PMID: 35977029) speech, motor delay as well as ID are observed in individuals harboring de novo pLoF variants in UBAP2L. The gene encodes a regulator of the stress granule (SG) assembly. Extensive evidence is provided on the effect of variants as well as the role of UBAP2L and other genes for components and/or regulation of SG in pathogenesis of NDDs. Among others a Ubap2l htz deletion mouse model (behavioral and cognitive impairment, abnormal cortical development due to impaired SG assembly, etc). Data from 26 previous studies, aggregating 40,853 probands with NDDs (mostly DD/ID, also ASD) suggest enrichment for DNMs in UBAP2L or other genes previously known and further shown to be important for SG formation (incl. G3BP1/G3BP2, CAPRIN1). Details provided below. Not associated with any phenotype in OMIM, G2P or SysNDD. -------- Jia et al (2022 - PMID: 35977029) describe 12 affected individuals with heterozygous de novo pLoF variants in UBAP2L. Phenotype: Features included hypotonia, speech (11/11) and motor delay (8/12), ID (8/10 with formal evaluation), variable behavioral concerns (ADHD 5/11, ASD in 4/10, etc). Seizures were reported in 7/12 with 3/10 having a formal diagnosis of epilepsy. Few had microcephaly (3/10). Facial dysmorphisms were common (9/9) and included abnormal palpebral fissures, deep prominent concha, high broad forehead, hypertelorism, thin upper lip and mild synophrys (each in 4 or less individuals). Short stature or skeletal alterations were described in some (4/10 each). Role of the gene: UBAP2L encodes an essential regulator of stress granule assembly. Stress granules are membraneless cytoplasmic compartments in eukaryotic cells, induced upon a variety of stressors and playing a role in regulation of gene expression. Variants identified : 9 nonsense/frameshift UBAP2L variants and 3 splicing ones were reported, in all cases as de novo events, upon trio/quad exome sequencing. All were absent from gnomAD. There were no other causative variants. Variant effect/studies (NM_014847.4 / NP_055662.3) : - Minigene assays revealed that the 3 splice variants all resulted in out-of-frame exon skipping. - In patient fibroblasts one of these splice variants was demonstrated to result to reduced protein levels. - 8 of the 9 nonsense/frameshift variants were predicted to result to NMD. - 1 nonsense variant (c.88C>T/p.Q30*) was shown to result to decreased protein expression in patient fibroblasts, with detection of the protein using an antibody for the C terminus but not the N terminus. Protein N-terminal sequencing confirmed that the protein lacked the N terminus, with utilization of an alternative start site (11 codons downstream). - Generation of HeLa UBAP2L KO cell lines resulted in significant reduction of SG numbers which was also the case for 4 variants studied, under stress conditions. - The protein has a DUF domain (aa 495-526) known to mediate interaction of UBAP2L with G3BP1 (a stress granule marker) with deletions of this domain leading to shuttling of UBAP2L from the cytoplasm to the nucleus. Truncating variants upstream of the DUF domain were shown to result in nuclear localization. Mouse model : - The authors generated Ubap2l KO model with hmz deletion of Ubap2l resulting in a lethal phenotype (2.6% survived) and htz deletion leading to behavioral issues (low preference for social novelty, anxious-like behaviors) and cognitive impairment. - Ubap2l haploinsufficiency resulted in abnormal cortical development and lamination with reduction of neural progenitor proliferation. - Ubap2l deficiency was shown to impair SG assembly during cortical development both under physiological stress conditions or upon utilization of an oxidative stress inducer. Additional evidence of UBAP2L and SG overall in pathogenesis of NDDs: - Based on DNMs from 40,853 individuals with NDDs from 26 studies (9,228 with ASD, 31,625 with DD/ID) the authors demonstrate significant excess of DNM in 31 genes encoding SG components, regulators or both, the latter being the case for UBAP2L and 2 further genes (G3BP1 and G3BP2 - both with crucial roles in SG assembly). - Excess dn splice-site (N=3) and missense (N=5) variants in G3BP1 were observed in the above cohort [c.95+1G>A, c.353+1G>T, c.539+1G>A / p.S208C, R320C, V366M]. - Excess dn missense (N=7) variants in G3BP2 were observed in the above cohort [p.R13W, D151N, E158K, L209P, E399D, K408E, R438C]. - Generation of G3BP1 or G3BP2 KO HeLa cell lines and immunofluorescence upon use of oxidative stress inducer revealed significant reduction of stress granules. - Generation of HeLa cell lines for 5 G3BP1 mutants (R78C*, R132I*, S208C*, R320C*, V366M) and 7 G3BP2 mutants (p.R13W*, D151N*, E158K, L209P*, E399D, K408E, R438C) revealed that several (those in asterisk) resulted in significantly fewer SG formation under oxidative stress compared to WT while the subcellular distribution of the proteins under stress was identical to WT. - Among the identified genes for SG enriched for DNMs, CAPRIN1 was implicated in previous publications as a NDD risk gene with 3 dn missense SNVs reported (p.I373K, p.Q446H, p.L484P). CAPRIN1 binding to G3BP1/2 has been shown to promote SG formation. Significant reduction of SG was observed in CAPRIN1 KO HeLa lines. p.I373K abolished interaction with G3BP1/2 and disrupted SG formation. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4915 | TMEM163 |
Teresa Zhao gene: TMEM163 was added gene: TMEM163 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: TMEM163 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: TMEM163 were set to PMID: 35953447 Phenotypes for gene: TMEM163 were set to Hypomyelinating leukodystrophy Review for gene: TMEM163 was set to GREEN Added comment: Four unrelated families with a hypomyelinating leukodystrophy phenotype. Genomic testing identified three distinct heterozygous missense variants in TMEM163 with two unrelated individuals sharing the same de novo variant. All have global developmental delay, three of them have seizures. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4912 | CAPRIN1 |
Paul De Fazio gene: CAPRIN1 was added gene: CAPRIN1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: CAPRIN1 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: CAPRIN1 were set to 35979925 Phenotypes for gene: CAPRIN1 were set to Neurodevelopmental disorder, CAPRIN1-related MONDO:0700092 Review for gene: CAPRIN1 was set to GREEN gene: CAPRIN1 was marked as current diagnostic Added comment: 12 individuals reported with ID and language impairment. Other features included seizures (4 individuals), hands and feet malformations (5 individuals), breathing problems (6 individuals), ocular problems (4 individuals) and hearing problems (3 individuals). All of the variants were nonsense (NMD-predicted) or splicing variants. 10 were de novo, 1 was inherited from an affected father. Functional studies supported pathogenicity. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4897 | ZMYND8 | Zornitza Stark Mode of inheritance for gene: ZMYND8 was changed from MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4895 | TAF4 | Konstantinos Varvagiannis reviewed gene: TAF4: Rating: GREEN; Mode of pathogenicity: None; Publications: 35904126; Phenotypes: ; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4895 | ZMYND8 |
Konstantinos Varvagiannis gene: ZMYND8 was added gene: ZMYND8 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: ZMYND8 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: ZMYND8 were set to 35916866; 32530565 Phenotypes for gene: ZMYND8 were set to Delayed speech and language development; Motor delay; Intellectual disability; Abnormality of cardiovascular system morphology; Hearing abnormality; Abnormality of vision; Abnormality of the face; Seizures Penetrance for gene: ZMYND8 were set to unknown Review for gene: ZMYND8 was set to GREEN Added comment: Dias et al (2022 - PMID: 35916866) describe the phenotype of 11 unrelated individuals with monoallelic de novo (or suspected de novo) missense (N=9) or truncating (N=2) ZMYND8 variants. One of these subjects was previously reported by Suzuki et al (2020 - PMID: 32530565). Features included speech delay/language difficulties (9/11), motor delay (9/11), ID (in 10/11 - profound in 1, moderate in 2), CHD (7/11 - PDA, VSD, ASD, pulmonary stenosis, etc), hearing or vision impairment (7/11). Seizures were reported in few (in text 5/11, table 2/11). Variable non-familial facial features were present in (9/11). As the authors discuss, ZMYND8 encodes a multidomain protein playing a role in transcription regulation, chromatin remodeling, regulation of super enhancers, DNA damage response/tumor suppression. The protein is broadly expressed in brain and shows highest expression in early development. Molecular modeling and/or a yeast two-hybrid system were suggestive of disrupted interaction of ZMYND8 with Drebrin (missense variants in PWWP domain) or GATAD2A (variants in MYND domain). Neuronal Zmynd8 knockdown in Drosophila resulted in deficits in habituation learning. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4884 | ABCD1 | Zornitza Stark Mode of inheritance for gene: ABCD1 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4883 | ABCD1 | Zornitza Stark reviewed gene: ABCD1: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Adrenoleukodystrophy, MIM# 300100; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4868 | C18orf32 |
Naomi Baker gene: C18orf32 was added gene: C18orf32 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: C18orf32 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: C18orf32 were set to PMID:35107634 Phenotypes for gene: C18orf32 were set to Neurodevelopmental disorder (MONDO:0700092), C18orf32-related Review for gene: C18orf32 was set to RED Added comment: Two siblings reported as affected, although sequencing only performed in one sibling, with homozygous loss-of-function variant identified. Clinical presentation included developmental delay, recurrent lower respiratory tract infections, sparse rough hair, roving eye movements, hypotonia, bilateral ankle contractures and inverted nipples. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4867 | SLITRK2 |
Paul De Fazio gene: SLITRK2 was added gene: SLITRK2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: SLITRK2 was set to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) Publications for gene: SLITRK2 were set to 35840571 Phenotypes for gene: SLITRK2 were set to Neurodevelopmental disorder, SLITRK2-related MONDO:0700092 Review for gene: SLITRK2 was set to GREEN gene: SLITRK2 was marked as current diagnostic Added comment: 6 missense variants and 1 nonsense variant (NOT NMD-predicted, single-exon gene) reported in 7 males and 1 female with neurodevelopmental disorders. Phenotypes included dev delay, mild to severe ID, delayed or absent speech, seizures and brain MRI anomalies (in some patients). The nonsense variant was identified in two affected brothers but not in the mother, suggesting it was de novo in the maternal germline. The variant in the one affected female was de novo. All other variants in hemizygous males were inherited from an unaffected mother. In one case, the variant was also identified in the unaffected grandmother. Functional studies showed some but not all variants displayed impaired membrane transport and impaired excitatory synapse-promoting effects. Conditional knockout mice exhibited impaired long-term memory and abnormal gait. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4865 | ADGRL1 |
Elena Savva gene: ADGRL1 was added gene: ADGRL1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: ADGRL1 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: ADGRL1 were set to PMID: 35907405 Phenotypes for gene: ADGRL1 were set to Neurodevelopmental disorder, ADGRL1-related (MONDO#0700092) Review for gene: ADGRL1 was set to GREEN Added comment: PMID: 35907405 - 9 patients w/ ADHD (3/9), autism (4/9), mild-moderate ID (5/9) and epilepsy (2/9) and facial dysmorphism (7/9). Variants include missense (4) and PTCs (5), and were either de novo (7/9) or inherited from parents with learning difficulties/ID (2/9). Functional studies on both PTCs and missense variants show significant reductions in calcium signalling and surface protein. Het null mouse model shows neurological and developmental abnormalities, with hom null mice non-viable. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4857 | HIST1H4E | Zornitza Stark Mode of inheritance for gene: HIST1H4E was changed from MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4854 | KMT2B | Zornitza Stark edited their review of gene: KMT2B: Added comment: Nine individuals reported in PMID 33150406 with heterozygous variants in this gene and intellectual disability, speech delay, microcephaly, growth delay, feeding problems, and dysmorphic features, including epicanthic folds, posteriorly rotated ears, syndactyly/clinodactyly of toes, and fifth finger clinodactyly, normal MRIs and NO dystonia.; Changed publications: 33150406; Changed phenotypes: Dystonia 28, childhood-onset 617284, MONDO:0015004, Intellectual developmental disorder, autosomal dominant 68, MIM# 619934 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4849 | PABPC1 |
Elena Savva gene: PABPC1 was added gene: PABPC1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: PABPC1 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: PABPC1 were set to PMID: 35511136 Phenotypes for gene: PABPC1 were set to Neurodevelopmental disorder, PABPC1-related (MONDO#0700092) Review for gene: PABPC1 was set to GREEN Added comment: PMID: 35511136 - 4 probands with an overlapping phenotype of DD, expressive speech delay, and autistic features and heterozygous de novo variants that cluster in the PABP domain of PABPC1. Electroporation of mouse embryo brains showed that Pabpc1 knockdown decreases the proliferation of neural progenitor cells. Wild-type Pabpc1 could rescue this disturbance, whereas 3 of the 4 variants did not. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4843 | WNK3 |
Lucy Spencer gene: WNK3 was added gene: WNK3 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: WNK3 was set to X-LINKED: hemizygous mutation in males, biallelic mutations in females Publications for gene: WNK3 were set to 35678782 Phenotypes for gene: WNK3 were set to Neurodevelopmental disorder, WNK3-related (MONDO#0700092) Review for gene: WNK3 was set to GREEN Added comment: 6 maternally inherited hemizygous variants, 3 missense, 2 canonical splice, and a nonsense. Seen in 14 individuals from 6 families, all 14 are male who inherited hemizygous variants from their unaffected heterozygous mothers. The variants cosegregated with disease in 3 families with multiple affected individuals. All 14 patients have ID, 11 have speech delay, 10 have facial abnormalities, 5 have seizures, 6 with microcephaly and 7 with anomalies in brain imaging. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4839 | TAF8 |
Zornitza Stark changed review comment from: Further 7 individuals reported from 4 families, three of which were consanguineous. Clinical features included severe psychomotor retardation with almost absent development, feeding problems, microcephaly, growth retardation, spasticity and epilepsy. Five had the previously reported c.781-1G > A variant in homozygous state. This is likely to be a founder variant. One family with different compound heterozygous variants.; to: Further 7 individuals reported from 4 families, three of which were consanguineous. Clinical features included severe psychomotor retardation with almost absent development, feeding problems, microcephaly, growth retardation, spasticity and epilepsy. Five had the previously reported c.781-1G > A variant in homozygous state. Unclear if this is a founder variant, families of different ethnicities. One family with different compound heterozygous variants. |
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| Intellectual disability syndromic and non-syndromic v0.4818 | PAN2 |
Naomi Baker gene: PAN2 was added gene: PAN2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: PAN2 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: PAN2 were set to PMID:35304602; 29620724 Phenotypes for gene: PAN2 were set to Syndromic disease MONDO:0002254 Review for gene: PAN2 was set to GREEN Added comment: PMID:35304602 reports five individuals from 3 families with biallelic (homozygous) loss-of-function variants. Clinical presentation incudes mild-moderate intellectual disability, hypotonia, sensorineural hearing loss, EEG abnormalities, congenital heart defects (tetralogy of Fallot, septal defects, dilated aortic root), urinary tract malformations, ophthalmological anomalies, short stature with other skeletal anomalies, and craniofacial features including flat occiput, ptosis, long philtrum, and short neck. PMID:29620724 reports one individual with biallelic (homozygous) loss-of-function variant who presented with global developmental delay, mild hypotonia, craniosynostosis, severe early-onset scoliosis, imperforate anus, and double urinary collecting system. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4814 | PRPF8 |
Krithika Murali gene: PRPF8 was added gene: PRPF8 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: PRPF8 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: PRPF8 were set to 35543142 Phenotypes for gene: PRPF8 were set to Intellectual disability; epilepsy; Retinitis pigmentosa 13 - MIM#600059 Review for gene: PRPF8 was set to GREEN Added comment: PMID 35543142 O'Grady et al 2022 report 14 unrelated individuals with heterozygous PRPF8 variants and ID, dymorphic features and epilepsy (7/14). Short stature, abnormal gait and cardiac anomalies also reported. 11 variants identified were de novo, 1 variant - maternal mosaicism, 1 variant - duo sequencing (not identified in mother, father could not be sequenced). 1 individual did not have parental testing. Cardiac anomalies varied and included benign cardiac tumour, dilated cardiomyopathy, dilated aortic root (COL5A2 VUS also identified), bicuspid aortic valve, cardiac arrest, self-resolving ASD/VSD. Heterozygous PRPF8 variants previously associated with retinitis pigmentosa. 1 out of the 14 individuals in this cohort had a diagnosis of RP. RP variants noted to cluster in the C'terminal MPN domain. The individual with RP in this paper had a variant in the preceding RNAase H homology domain near the C-terminus. Not all of the individuals in this paper had formal ophthalmological examination Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4814 | BUB1 |
Paul De Fazio gene: BUB1 was added gene: BUB1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: BUB1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: BUB1 were set to 35044816; 19772675; 19117986; 23209306 Phenotypes for gene: BUB1 were set to Neurodevelopmental disorder, BUB1-related MONDO:0700092; Intellectual disability and microcephaly Review for gene: BUB1 was set to GREEN gene: BUB1 was marked as current diagnostic Added comment: 2 unrelated patients with ID, microcephaly, short stature, dysmorphic features reported with biallelic variants: P1 (3yo male): homozygous start-loss variant (2 hets and 0 hom in gnomAD). Functional testing showed a small amount of full-length protein was translated, and BUB1 recruitment to kinetochores was nearly undetectable. P2 (16yo female): compound heterozygous for a canonical splice variant (1 het and no hom in gnomAD) and an NMD-predicted frameshift variant (absent from gnomAD). The splice variant was shown to result in an in-frame deletion of 54 amino acids in the kinase domain. P2 cells have reduced protein levels but essentially no kinase activity. BUB1 patient cells have impaired mitotic fidelity. Homozygous Bub1 disruption in mice is embryonic lethal (PMID:19772675). A hypomorphic mouse is viable with increased tumourigenesis with ageing and aneuploidy (PMID:19117986). A kinase-dead mouse does not show increased tumourigenesis but does have a high frequency of aneuploid cells (PMID:23209306) Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4813 | HEATR3 |
Chern Lim gene: HEATR3 was added gene: HEATR3 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: HEATR3 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: HEATR3 were set to PMID: 35213692 Phenotypes for gene: HEATR3 were set to Bone marrow failure, short stature, facial and acromelic dysmorphic features, and mild intellectual disability; Diamond Blackfan anaemia MONDO:0015253, HEATR3 related Review for gene: HEATR3 was set to AMBER gene: HEATR3 was marked as current diagnostic Added comment: PMID: 35213692: - 4 unrelated individuals with biallelic HEATR3 variants (missense and splice site variants), exhibiting bone marrow failure, short stature, facial and acromelic dysmorphic features, and mild intellectual disability. - Functional analysis showed HEATR3 variants destabilised the protein, resulting in a reduction of nuclear uL18 and impaired ribosome biogenesis. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4781 | OPHN1 | Zornitza Stark Mode of inheritance for gene: OPHN1 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4780 | OPHN1 | Zornitza Stark reviewed gene: OPHN1: Rating: GREEN; Mode of pathogenicity: None; Publications: 20528889, 9582072, 12807966, 16221952; Phenotypes: Mental retardation, X-linked, with cerebellar hypoplasia and distinctive facial appearance, MIM#300486; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4776 | ADD1 |
Chirag Patel gene: ADD1 was added gene: ADD1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: ADD1 was set to BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal Publications for gene: ADD1 were set to PMID: 34906466 Phenotypes for gene: ADD1 were set to Intellectual disability, corpus callosum dysgenesis, and ventriculomegaly; no OMIM # Review for gene: ADD1 was set to GREEN Added comment: 4 unrelated individuals affected by ID and/or complete or partial agenesis of corpus callosum, and enlarged lateral ventricles. WES found loss-of-function variants - 1 recessive missense variant and 3 de novo variants. The recessive variant is associated with ACC and enlarged lateral ventricles, and the de novo variants were associated with complete or partial agenesis of corpus callosum, mild ID and attention deficit. Human variants impair ADD1 protein expression and/or dimerization with ADD2. Add1 knockout mice recapitulate corpus callosum dysgenesis and ventriculomegaly phenotypes. Three adducin genes (ADD1, ADD2, and ADD3) encode cytoskeleton proteins that are critical for osmotic rigidity and cell shape. ADD1, ADD2, and ADD3 form heterodimers (ADD1/ADD2, ADD1/ADD3), which further form heterotetramers. Adducins interconnect spectrin and actin filaments to form polygonal scaffolds beneath the cell membranes and form ring-like structures in neuronal axons. Adducins regulate mouse neural development, but their function in the human brain is unknown. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4740 | DROSHA |
Lucy Spencer gene: DROSHA was added gene: DROSHA was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: DROSHA was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: DROSHA were set to 35405010 Phenotypes for gene: DROSHA were set to Neurodevelopmental disorder (MONDO#0700092), DROSHA-related Review for gene: DROSHA was set to AMBER Added comment: 2 individuals with profound intellectual disability, epilepsy, white matter atrophy, microcephaly, and dysmorphic features, who carry damaging de novo heterozygous variants in DROSHA. Both variants are missense, absent from gnomad. Both individuals noted to have Rett-like features. Functional studies in patient fibroblasts showed one of the missense altered the expression of mature miRNA. Fruit fly models with homozygous LOF variants die during larval stages. introduction of the missense seen in the patients was able to partially rescue this phenotype suggesting LOF is not the mechanism. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4736 | KCNH5 |
Elena Savva gene: KCNH5 was added gene: KCNH5 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: KCNH5 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: KCNH5 were set to https://www.medrxiv.org/content/10.1101/2022.04.26.22274147v1 Phenotypes for gene: KCNH5 were set to Neurodevelopmental disorder MONDO#0700092, KCNH5-related Mode of pathogenicity for gene: KCNH5 was set to Other Review for gene: KCNH5 was set to GREEN Added comment: Happ (2022), preprint: Screen of 893 patients with DEE found 17 patients with missense variants (16/17 de novo, 1/17 inherited). GOF mechanism suggested. Patient phenotypes included focal/generalized seizures, Cognitive outcome for the ten individuals >5 years ranged from normal (3/10) to mild (3/10), moderate (2/10), severe (1/10) and profound (1/10) intellectual disability (ID) p.Arg327His (7 probands), p.Arg333His (4 probands) were recurring Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4708 | AP1S2 | Zornitza Stark Mode of inheritance for gene: AP1S2 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4707 | AP1S2 | Zornitza Stark reviewed gene: AP1S2: Rating: GREEN; Mode of pathogenicity: None; Publications: 17186471, 17617514, 19377476, 30714330, 23756445; Phenotypes: Pettigrew syndrome, MIM# 304340; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4703 | CNNM2 | Ain Roesley Mode of inheritance for gene: CNNM2 was changed from Unknown to BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4702 | CNNM2 | Ain Roesley reviewed gene: CNNM2: Rating: GREEN; Mode of pathogenicity: None; Publications: 34604137, 35170241; Phenotypes: Hypomagnesemia 6, renal MIM#613882, Hypomagnesemia, seizures, and mental retardation MIM#616418; Mode of inheritance: BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal; Current diagnostic: yes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4687 | GLRA2 |
Zornitza Stark gene: GLRA2 was added gene: GLRA2 was added to Intellectual disability syndromic and non-syndromic. Sources: Expert list Mode of inheritance for gene: GLRA2 was set to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) Publications for gene: GLRA2 were set to 26370147; 20479760; 35294868 Phenotypes for gene: GLRA2 were set to Intellectual developmental disorder, X-linked, syndromic, Pilorge type, MIM# 301076 Review for gene: GLRA2 was set to GREEN Added comment: More than 10 unrelated families reported. Both males and females affected, though some mothers are asymptomatic or mild. Zebrafish model. Sources: Expert list |
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| Intellectual disability syndromic and non-syndromic v0.4684 | PPP1R15B | Zornitza Stark Phenotypes for gene: PPP1R15B were changed from to Microcephaly, short stature, and impaired glucose metabolism 2, MIM# 616817 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4680 | PPP1R15B | Zornitza Stark reviewed gene: PPP1R15B: Rating: AMBER; Mode of pathogenicity: None; Publications: 26159176, 26307080, 27640355; Phenotypes: Microcephaly, short stature, and impaired glucose metabolism 2, MIM# 616817; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4680 | PRMT7 | Zornitza Stark Phenotypes for gene: PRMT7 were changed from to Short stature, brachydactyly, intellectual developmental disability, and seizures, MIM# 617157 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4677 | PRMT7 | Zornitza Stark reviewed gene: PRMT7: Rating: GREEN; Mode of pathogenicity: None; Publications: 26437029, 27718516, 30513135; Phenotypes: Short stature, brachydactyly, intellectual developmental disability, and seizures, MIM# 617157; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4662 | PIGA | Zornitza Stark edited their review of gene: PIGA: Added comment: PMID 34875027: variants in PIGA causing a neurodevelopment disorder and a juvenile form of hereditary hemochromatosis reported in > three unrelated patients. All patients had increased serum iron, ferritin and transferrin saturation levels, high ALP and low hepcidin. All patients had generalised seizures and intellectual disability. A subpopulation of patient blood cells showed a slight reduction of GPI-anchored proteins, suggesting that the mutations were hypomorphic and retained some residual activity. CRISPR/Cas12a-mediated knockdown of PIGA in Hep3B liver cells eliminated the cell surface expression of GPI-anchored proteins CD59 and hemojuvelin (HJV; 608374), as well as caused decreased expression of hepcidin (606464) compared to controls. These hypomorphic alleles could explain the milder neurologic phenotype, which allowed for sufficiently long survival for the iron overload phenotype to manifest.; Changed publications: 22305531, 24357517, 24706016, 26545172, 33333793, 32694024, 34875027; Changed phenotypes: Multiple congenital anomalies-hypotonia-seizures syndrome 2, MIM# 300868, MONDO:0010466, Neurodevelopmental disorder with epilepsy and haemochromatosis, MIM# 301072 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4658 | TRAPPC10 |
Naomi Baker gene: TRAPPC10 was added gene: TRAPPC10 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: TRAPPC10 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: TRAPPC10 were set to PMID: 35298461; 30167849 Phenotypes for gene: TRAPPC10 were set to neurodevelopmental disorder (MONDO:0700092), TRAPPC10-related Review for gene: TRAPPC10 was set to GREEN Added comment: PMID: 35298461 – two Pakistani families reported with homozygous variants. Family 1 has frameshift variant in 8 affected individual and family 2 has missense variant in 2 affected individuals. Patients present with microcephaly, short stature, hypotonia, severe ID and behavioural abnormalities. Seizures also reported in 4/10 individuals. Paper also reported brain abnormalities in null mouse model and other functional in transfected cell lines. PMID: 30167849 – initial report of family 2 above. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4650 | TSPAN7 | Zornitza Stark Mode of inheritance for gene: TSPAN7 was changed from X-LINKED: hemizygous mutation in males, biallelic mutations in females to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4649 | TSPAN7 | Zornitza Stark Mode of inheritance for gene: TSPAN7 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4647 | TSPAN7 | Zornitza Stark reviewed gene: TSPAN7: Rating: AMBER; Mode of pathogenicity: None; Publications: 10449641, 12070254, 10655063, 25081361; Phenotypes: Intellectual developmental disorder, X-linked 58, MIM #300210, MONDO:0010266; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4642 | RBMX |
Zornitza Stark gene: RBMX was added gene: RBMX was added to Intellectual disability syndromic and non-syndromic. Sources: Expert Review Mode of inheritance for gene: RBMX was set to X-LINKED: hemizygous mutation in males, biallelic mutations in females Publications for gene: RBMX were set to 25256757; 34260915 Phenotypes for gene: RBMX were set to Intellectual developmental disorder, syndromic 11, Shashi type, MIM#300238 Review for gene: RBMX was set to AMBER Added comment: Hemizygous truncating variant reported segregating in multiple affected individuals in a single family. Some supportive functional data. Sources: Expert Review |
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| Intellectual disability syndromic and non-syndromic v0.4640 | WDR11 | Elena Savva Phenotypes for gene: WDR11 were changed from Intellectual disability; Microcephaly; Short stature to Neurodevelopmental disorder, MONDO:0700092, WDR11-related | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4613 | SMS | Zornitza Stark Mode of inheritance for gene: SMS was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4612 | SMS | Zornitza Stark reviewed gene: SMS: Rating: GREEN; Mode of pathogenicity: None; Publications: 30237987, 34177437, 32838743, 23805436; Phenotypes: Intellectual developmental disorder, X-linked syndromic, Snyder-Robinson type, MIM# 309583, Syndromic X-linked intellectual disability Snyder type, MONDO:0010664; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4599 | NONO | Zornitza Stark Mode of inheritance for gene: NONO was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4595 | NONO | Krithika Murali reviewed gene: NONO: Rating: GREEN; Mode of pathogenicity: None; Publications: 26571461, 27329731, 27550220; Phenotypes: Intellectual developmental disorder, X-linked syndromic 34 - MIM#300967; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4592 | NLGN3 | Zornitza Stark Mode of inheritance for gene: NLGN3 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4587 | NHS | Zornitza Stark Mode of inheritance for gene: NHS was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4580 | NLGN3 | Krithika Murali reviewed gene: NLGN3: Rating: GREEN; Mode of pathogenicity: None; Publications: 28584888, 12669065, 25167861; Phenotypes: {Asperger syndrome susceptibility, X-linked 1} - MIM#300494, {Autism susceptibility, X-linked 1} - MIM#300425; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4580 | KCND3 | Elena Savva reviewed gene: KCND3: Rating: GREEN; Mode of pathogenicity: None; Publications: PMID: 35021282, 32823520, 34067185, 34361012; Phenotypes: Spinocerebellar ataxia 19 MIM#607346; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4580 | NHS | Krithika Murali reviewed gene: NHS: Rating: GREEN; Mode of pathogenicity: None; Publications: 31755796, 25266737; Phenotypes: Nance-Horan syndrome - MIM#302350, Cataract 40, X-linked - MIM#302200; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4580 | NDUFV2 | Zornitza Stark changed review comment from: Multiple unrelated families. Common presenting features include HOCM and encephalopathy, unclear in what proportion ID is likely to be the presenting or main feature.; to: Multiple unrelated families. Common presenting features include HOCM and encephalopathy, or episodic regression with cavitating leukoencephalopathy, unclear in what proportion ID is likely to be the presenting or main feature. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4556 | NAT8L | Zornitza Stark Phenotypes for gene: NAT8L were changed from ?N-acetylaspartate deficiency - MIM#614063 to N-acetylaspartate deficiency - MIM#614063 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4554 | NAT8L | Zornitza Stark reviewed gene: NAT8L: Rating: RED; Mode of pathogenicity: None; Publications: ; Phenotypes: N-acetylaspartate deficiency - MIM#614063; Mode of inheritance: None | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4546 | NAT8L |
Krithika Murali gene: NAT8L was added gene: NAT8L was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: NAT8L was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: NAT8L were set to 11310630; 19807691; 32275776 Phenotypes for gene: NAT8L were set to ?N-acetylaspartate deficiency - MIM#614063 Review for gene: NAT8L was set to AMBER Added comment: Absence of brain N-acetylaspartate, has been described in only one patient, with truncal ataxia, marked developmental delay, seizures and secondary microcephaly (first described by - PMID: 11310630 Martin et al 2001). PMID: 19807691 - Wiame et al 2009 identified in this patient a homozygous 19 bp NAT8L gene deletion, resulting in a change in reading frame and the absence of production of a functional protein. The affected individual is adopted and testing of the biological parents was not possible. The authors provide supportive functional studies. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4519 | HIST1H4E |
Paul De Fazio gene: HIST1H4E was added gene: HIST1H4E was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: HIST1H4E was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: HIST1H4E were set to 35202563 Phenotypes for gene: HIST1H4E were set to Neurodevelopmental disorder, HIST1H4E-related MONDO:0700092 Review for gene: HIST1H4E was set to GREEN gene: HIST1H4E was marked as current diagnostic Added comment: 17 patients identified with de novo missense variants affecting Lys31, Pro32, Arg35, Leu37, Arg40 (recurrent), Arg45 (recurrent), Tyr98 (recurrent). All individuals had ID/dev delay. Additional phenotypes in some but not all individuals included epilepsy, hypotonia, facial dysmorphism. Most had reduced birth length, OFC, weight (-1 to -3SD). A zebrafish model has developmental defects. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4519 | HIST1H4D |
Paul De Fazio gene: HIST1H4D was added gene: HIST1H4D was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: HIST1H4D was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: HIST1H4D were set to 35202563 Phenotypes for gene: HIST1H4D were set to Neurodevelopmental disorder, HIST1H4D-related MONDO:0700092 Review for gene: HIST1H4D was set to AMBER gene: HIST1H4D was marked as current diagnostic Added comment: Single individual described with a de novo missense variant Arg41His (Arg40 in H4 nomenclature). Apart from langauge delay and moderate ID, phenotypes included facial dysmorphisms and cochlear abnormalities and arhinencephaly on MRI. Hearing was normal. Birth length, OFC, weight were all reduced (-2 to -2.5SD). A zebrafish model has developmental defects. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4519 | HIST1H4C | Paul De Fazio reviewed gene: HIST1H4C: Rating: GREEN; Mode of pathogenicity: None; Publications: 35202563; Phenotypes: Tessadori-van Haaften neurodevelopmental syndrome 1 MIM#619758, Neurodevelopmental disorder, HIST1H4C-related MONDO:0700092; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown; Current diagnostic: yes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4517 | HIST1H4F |
Elena Savva gene: HIST1H4F was added gene: HIST1H4F was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: HIST1H4F was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: HIST1H4F were set to PMID: 35202563 Phenotypes for gene: HIST1H4F were set to Neurodevelopmental disorders Review for gene: HIST1H4F was set to GREEN Added comment: PMID: 35202563 - single de novo missense in a patient with neurodevelopmental features of intellectual disability and motor and/or gross developmental delay. - zebrafish studies show a significant increase in all of mild dev delay, necrosis, defective organogenesis and pre-gastrulation failure Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4515 | HIST1H4I |
Elena Savva gene: HIST1H4I was added gene: HIST1H4I was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: HIST1H4I was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: HIST1H4I were set to PMID: 35202563 Phenotypes for gene: HIST1H4I were set to Neurodevelopmental syndrome Review for gene: HIST1H4I was set to GREEN Added comment: PMID: 35202563 - 3 unrelated de novo patients, p.His75Arg was recurring and observed in 2/3 probands. - Zebrafish study shows both variants resulted in a significant increases in developmental issues such as in mild dev delay, necrosis and defective organogenesis. - All patients had intellectual disability and motor and/or gross developmental delay and dysmorphisms. - 2/3 patients showed bilateral conductive hearing loss Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4510 | HIST1H4J | Elena Savva reviewed gene: HIST1H4J: Rating: AMBER; Mode of pathogenicity: None; Publications: PMID: 35202563, 31804630; Phenotypes: Neurodevelopmental syndrome, microcephaly, intellectual disability, dysmorphic features; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4509 | CHKA | Zornitza Stark Phenotypes for gene: CHKA were changed from Abnormal muscle tone; Global developmental delay; Intellectual disability; Seizures; Microcephaly; Abnormality of movement; Abnormality of nervous system morphology; Short stature to Neurodevelopmental disorder, MONDO:0700092; Abnormal muscle tone; Global developmental delay; Intellectual disability; Seizures; Microcephaly; Abnormality of movement; Abnormality of nervous system morphology; Short stature | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4507 | CHKA |
Konstantinos Varvagiannis gene: CHKA was added gene: CHKA was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: CHKA was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: CHKA were set to 35202461 Phenotypes for gene: CHKA were set to Abnormal muscle tone; Global developmental delay; Intellectual disability; Seizures; Microcephaly; Abnormality of movement; Abnormality of nervous system morphology; Short stature Penetrance for gene: CHKA were set to Complete Review for gene: CHKA was set to GREEN Added comment: Klöckner (2022 - PMID: 35202461) describe the phenotype of 6 individuals (from 5 unrelated families) harboring biallelic CHKA variants. Shared features incl. abnormal muscle tone(6/6 - hypertonia or hypotonia, 3/6 each), DD/ID (6/6,severe in 4, severe/profound in 2), epilepsy (6/6 - onset: infancy - 3y2m | epileptic spasms or GS at onset), microcephaly (6/6), movement disorders (3/6 - incl. dyskinesia, rigidity, choreoatetotic movements). 2/5 individuals exhibited MRI abnormalities, notably hypomyelination. Short stature was observed in 4/6. Eventual previous genetic testing was not discussed. Exome sequencing (quattro ES for 2 sibs, trio ES for 1 individual, singleton for 3 probands) revealed biallelic CHKA variants in all affected individuals. Sanger sequencing was performed for confirmation and segregation studies. Other variants (in suppl.) were not deemed to be causative for the neurodevelopmental phenotype. 3 different missense, 1 start-loss and 1 truncating variant were identified, namely (NM_0012772.2): - c.421C>T/p.(Arg141Trp) [3 hmz subjects from 2 consanguineous families], - c.580C>T/p.Pro194Ser [1 hmz individual born to consanguineous parents], - c.2T>C/p.(Met1?) [1 hmz individual born to related parents], - c.14dup/p.(Cys6Leufs*19) in trans with c.1021T>C/p.(Phe341Leu) in 1 individual. CHKA encodes choline kinase alpha, an enzyme catalyzing the first step of phospholipid synthesis in the Kennedy pathway. The pathway is involved in de novo synthesis of glycerophospholipids, phosphatidylcholine and phosphatidylethanolamine being the most abundant in eukaryotic membranes. CHKA with its paralog (CHKB) phosphorylates either choline or ethanolamine to phosphocholine or phosphoethanolamine respectively with conversion of ATP to ADP. As the authors comment, biallelic pathogenic variants in CHKB cause a NDD with muscular dystrophy, hypotonia, ID, microcephaly and structural mitochondrial anomalies (MIM 602541). [Prominent mitochondrial patterning was observed in a single muscle biopsy available from an individual with biallelic CHKA variants]. Other disorders of the Kennedy pathway (due to biallelic PCYT2, SELENOI, PCYT1A variants) present with overlapping features incl. variable DD/ID (no-severe), microcephaly, seizures, visual impairment etc. CHKA variants were either absent or observed once in gnomAD, affected highly conserved AAs with multiple in silico predictions in favor of a deleterious effect. In silico modeling suggests structural effects for several of the missense variants (Arg141Trp, Pro194Ser presumably affect ADP binding, Phe341 lying close to the binding site of phosphocholine). Each of the missense variants was expressed in yeast cells and W. Blot suggested expression at the expected molecular weight at comparative levels. The 3 aforementioned variants exhibited reduced catalytic activity (20%, 15%, 50% respectively). NMD is thought to underly the deleterious effect of the frameshift one (not studied). The start-loss variant is expected to result in significantly impaired expression and protein function as eventual utilization of the next possible start codon - occurring at position 123 - would remove 26% of the protein. Chka(-/-) is embryonically lethal in mice, suggesting that complete loss is not compatible with life. Reduction of choline kinase activity by 30% in heterozygous mice did not appear to result in behavioral abnormalities although this was not studied in detail (PMID cited: 18029352). Finally, screening of 1566 mouse lines identified 198 genes whose disruption yields neuroanatomical phenotypes, Chka(+/-) mice being among these (PMID cited: 31371714). There is no associated phenotype in OMIM, Gene2Phenotype or SysID. Overall this gene can be considered for inclusion in the ID and epilepsy panes with green or amber rating (>3 individuals, >3 variants, variant studies, overlapping phenotype of disorders belonging to the same pathway, etc). Consider also inclusion in the microcephaly panel (where available this seemed to be of postnatal onset). Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4501 | SYP | Zornitza Stark Mode of inheritance for gene: SYP was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4500 | SYP | Zornitza Stark reviewed gene: SYP: Rating: GREEN; Mode of pathogenicity: None; Publications: 23966691, 19377476; Phenotypes: Mental retardation, X-linked 96 MIM#300802; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4500 | SPRED2 | Zornitza Stark Phenotypes for gene: SPRED2 were changed from Rasopathy; developmental delay; intellectual disability; cardiac defects; short stature; skeletal anomalies; a typical facial gestalt to Noonan syndrome 14, MIM# 619745 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4485 | BAP1 |
Anna Ritchie gene: BAP1 was added gene: BAP1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: BAP1 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: BAP1 were set to PMID: 35051358 Phenotypes for gene: BAP1 were set to syndromic intellectual disability MONDO:0000508 Penetrance for gene: BAP1 were set to unknown Review for gene: BAP1 was set to GREEN Added comment: 11 de novo germline heterozygous missense BAP1 variants associated with a rare syndromic neurodevelopmental disorder. Functional analysis showed that most of the variants cannot rescue the consequences of BAP1 inactivation, suggesting a loss-of-function mechanism. All affected individuals harboring a de novo BAP1 variant had DD or ID (11/11) characterized notably by speech (11/ 11) and motor delay (6/11). Most of them had hypotonia (7/11), seizures (6/11), and abnormal behavior (8/10), including autism spectrum disorder, attention deficit hyperactivity disorder, and hypersensitivity. Almost all individuals showed dysmorphic facial features (10/11), and more than half (6/11) had skeletal malformations (involving the hands [4/11], feet [3/11], or spine [2/11]). Most of the individuals had growth failure (9/11), including four individuals with a very short stature. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4484 | SOD1 |
Naomi Baker gene: SOD1 was added gene: SOD1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: SOD1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: SOD1 were set to PMID: 31314961; 31332433; 34788402 Phenotypes for gene: SOD1 were set to Spastic tetraplegia and axial hypotonia, progressive, MIM#618598 Review for gene: SOD1 was set to GREEN Added comment: Phenotypes include one individual with axial hypotonia and loss of gross and fine motor function beginning at 6 months of age, after which severe, progressive spastic tetraparesis developed and Babinski’s sign was present in both feet. MRI of brain detected mild frontoparietal atrophy. The second individual had severe and marked by progressive loss of motor abilities from 9 months of age, tetraspasticity with predominance in the lower extremities, mild cerebellar atrophy, and hyperekplexia-like symptoms. Dysmorphic features such as low set, posteriorly rotated ears, and overlapping toes The third individual is an infant with severe global developmental delay, axial hypotonia and limb spasticity. No dysmorphic facial features were noted, but she had a high arched palate, bilateral 5th finger clinodactyly, partial toe syndactyly of the second and third toes, and a single hyperpigmented macule tongue fasciculations, axial hypotonia with limb spasticity (more pronounced in the lower limbs), ankle clonus, and brisk patellar deep tendon reflexes. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4473 | KCNN2 | Zornitza Stark Mode of inheritance for gene: KCNN2 was changed from MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4459 | GDI1 | Zornitza Stark Mode of inheritance for gene: GDI1 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4458 | GDI1 | Zornitza Stark reviewed gene: GDI1: Rating: GREEN; Mode of pathogenicity: None; Publications: 28863211, 22002931, 9620768, 9668174; Phenotypes: Intellectual developmental disorder, X-linked 41 MIM#300849; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4435 | SIN3A | Chirag Patel changed review comment from: 9 patients from 5 unrelated families reported with heterozygous truncating mutations in the SIN3A gene. Features include intellectual disability, ASD, seizures, dysmorphism, short stature, microcephaly, joint hypermotility, and small hands and feet. Brain imaging showed dilated ventricles, thin corpus callosum and, in some cases, dysgyria or polymicrogyria. Suitable for fetal anomalies panel.; to: 9 patients from 5 unrelated families reported with heterozygous truncating mutations in the SIN3A gene. Features include intellectual disability, ASD, seizures, dysmorphism, short stature, microcephaly, joint hypermotility, and small hands and feet. Brain imaging showed dilated ventricles, thin corpus callosum and, in some cases, dysgyria or polymicrogyria. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4430 | HNRNPH2 | Zornitza Stark Mode of inheritance for gene: HNRNPH2 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4429 | HNRNPH2 | Zornitza Stark reviewed gene: HNRNPH2: Rating: GREEN; Mode of pathogenicity: None; Publications: 34907471, 33728377, 31670473, 31236915, 30887513; Phenotypes: Intellectual developmental disorder, X-linked, syndromic, Bain type MIM#300986; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4427 | PRKAR1B | Zornitza Stark Mode of inheritance for gene: PRKAR1B was changed from MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4424 | NAA10 | Zornitza Stark Mode of inheritance for gene: NAA10 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4423 | NAA10 | Zornitza Stark reviewed gene: NAA10: Rating: GREEN; Mode of pathogenicity: None; Publications: 30842225, 34075687, 21700266; Phenotypes: Microphthalmia, syndromic 1, MIM# 309800, Ogden syndrome MIM#300855; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4422 | VPS50 | Zornitza Stark Phenotypes for gene: VPS50 were changed from Neonatal cholestatic liver disease; Failure to thrive; Profound global developmental delay; Postnatal microcephaly; Seizures; Abnormality of the corpus callosum to Neurodevelopmental disorder with microcephaly, seizures, and neonatal cholestasis , MIM#619685; Neonatal cholestatic liver disease; Failure to thrive; Profound global developmental delay; Postnatal microcephaly; Seizures; Abnormality of the corpus callosum | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4420 | CCND2 |
Alison Yeung Added comment: Comment on phenotypes: Distal variants associated with Megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome 3 Proximal variants associated with reciprocal phenotype of mild neurodevelopment disorder with microcephaly and short stature |
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| Intellectual disability syndromic and non-syndromic v0.4418 | PRKAR1B | Paul De Fazio reviewed gene: PRKAR1B: Rating: GREEN; Mode of pathogenicity: None; Publications: 33833410; Phenotypes: Marbach-Schaaf neurodevelopmental syndrome MIM#619680; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown; Current diagnostic: yes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4418 | NAA10 | Ain Roesley reviewed gene: NAA10: Rating: GREEN; Mode of pathogenicity: None; Publications: 34075687; Phenotypes: syndromic intellectual disability MONDO:0000508; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males); Current diagnostic: yes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4418 | PRKAR1B | Paul De Fazio reviewed gene: PRKAR1B: Rating: GREEN; Mode of pathogenicity: None; Publications: 33833410; Phenotypes: Marbach-Schaaf neurodevelopmental syndrome MIM#619680; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown; Current diagnostic: yes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4397 | BRWD3 | Zornitza Stark Mode of inheritance for gene: BRWD3 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4396 | BRWD3 | Zornitza Stark reviewed gene: BRWD3: Rating: GREEN; Mode of pathogenicity: None; Publications: 17668385, 30628072, 24462886; Phenotypes: Intellectual developmental disorder, X-linked 93, MIM # 300659; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4391 | CSTF2 |
Zornitza Stark gene: CSTF2 was added gene: CSTF2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: CSTF2 was set to X-LINKED: hemizygous mutation in males, biallelic mutations in females Publications for gene: CSTF2 were set to 32816001 Phenotypes for gene: CSTF2 were set to Intellectual disability Review for gene: CSTF2 was set to AMBER Added comment: Four individuals from a single family, spanning two generations, segregating a missense variant. Functional data, including a mouse model and a gene reporter assay. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4363 | CCDC22 | Zornitza Stark Mode of inheritance for gene: CCDC22 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4362 | CCDC22 | Zornitza Stark reviewed gene: CCDC22: Rating: GREEN; Mode of pathogenicity: None; Publications: 21826058, 24916641, 34020006, 33059814, 31971710; Phenotypes: Ritscher-Schinzel syndrome 2, MIM# 300963; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4358 | ADCY5 | Zornitza Stark edited their review of gene: ADCY5: Added comment: Neurodevelopmental disorder with hyperkinetic movements and dyskinesia (NEDHYD) is an autosomal recessive complex neurologic disorder characterized by severe global developmental delay with axial hypotonia, impaired intellectual development, poor overall growth, and abnormal involuntary hyperkinetic movements, including dystonia, myoclonus, spasticity, and orofacial dyskinesia. It is the most severe manifestation of ADCY5-related dyskinetic disorders. Five individuals from 2 families reported.; Changed rating: AMBER; Changed publications: 22782511, 24700542, 33051786, 32647899, 33704598, 34631954, 28971144, 30975617; Changed phenotypes: Neurodevelopmental disorder with hyperkinetic movements and dyskinesia (NEDHYD), MIM#619651; Changed mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4356 | CAMK2A | Zornitza Stark Mode of inheritance for gene: CAMK2A was changed from Unknown to BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4355 | CAMK2A | Zornitza Stark reviewed gene: CAMK2A: Rating: GREEN; Mode of pathogenicity: None; Publications: 32600977, 29784083, 29560374; Phenotypes: Mental retardation, autosomal recessive 63 MIM#618095, Mental retardation, autosomal dominant 53 MIM#617798; Mode of inheritance: BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4345 | CLCN7 |
Zornitza Stark gene: CLCN7 was added gene: CLCN7 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: CLCN7 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: CLCN7 were set to 31155284 Phenotypes for gene: CLCN7 were set to Hypopigmentation, organomegaly, and delayed myelination and development, MIM# 618541 Mode of pathogenicity for gene: CLCN7 was set to Loss-of-function variants (as defined in pop up message) DO NOT cause this phenotype - please provide details in the comments Review for gene: CLCN7 was set to AMBER Added comment: Two individuals reported with same missense variant and hypopigmentation, organomegaly, and delayed myelination and development. Variant is GoF. No osteopetrosis, biopsy findings from skin and other organs are consistent with a lysosomal storage disorder. IUGR, prematurity and polyhydramnios are features. Bi-allelic variants in this gene are associated with osteopetrosis. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4329 | CNKSR2 | Zornitza Stark Mode of inheritance for gene: CNKSR2 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4328 | CNKSR2 | Zornitza Stark edited their review of gene: CNKSR2: Changed mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4322 | FOXR1 |
Paul De Fazio gene: FOXR1 was added gene: FOXR1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: FOXR1 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: FOXR1 were set to 34723967 Phenotypes for gene: FOXR1 were set to Postnatal microcephaly, progressive brain atrophy and global developmental delay Mode of pathogenicity for gene: FOXR1 was set to Loss-of-function variants (as defined in pop up message) DO NOT cause this phenotype - please provide details in the comments Review for gene: FOXR1 was set to AMBER gene: FOXR1 was marked as current diagnostic Added comment: 1 patient described with a de novo missense variant. Phenotypes include: postnatal microcephaly, progressive brain atrophy, skeletal abnormalities, brain abnormalities, ophthalmic abnormalities, neuromuscular abnormalities, and dysmorphic features. A variant in ATP1A3 was considered to have contributed to the final phenotype. In vitro functional evidence is supportive of pathogenicity (variant causes protein instability and abnormal nuclear aggregation). A mouse knockout has comparable phenotypes, and a severe survival deficit. Rated amber (1 patient, functional evidence, mouse model). Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4322 | FOXR2 |
Paul De Fazio gene: FOXR2 was added gene: FOXR2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: FOXR2 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: FOXR2 were set to 34723967 Phenotypes for gene: FOXR2 were set to Postnatal microcephaly, progressive brain atrophy and global developmental delay Review for gene: FOXR2 was set to AMBER gene: FOXR2 was marked as current diagnostic Added comment: 1 patient described with a de novo missense variant. Phenotypes include: postnatal microcephaly, progressive brain atrophy, skeletal abnormalities, brain abnormalities, ophthalmic abnormalities, neuromuscular abnormalities, and dysmorphic features. A variant in ATP1A3 was considered to have contributed to the final phenotype. In vitro functional evidence is supportive of pathogenicity (variant causes protein instability and abnormal nuclear aggregation). A mouse knockout has comparable phenotypes, and a severe survival deficit. Rated amber (1 patient, functional evidence, mouse model). Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4308 | CUL4B | Zornitza Stark Mode of inheritance for gene: CUL4B was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4307 | CUL4B | Zornitza Stark reviewed gene: CUL4B: Rating: GREEN; Mode of pathogenicity: None; Publications: 17236139, 19377476; Phenotypes: Mental retardation, X-linked, syndromic 15 (Cabezas type), MIM# 300354; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4279 | IL1RAPL1 | Zornitza Stark Mode of inheritance for gene: IL1RAPL1 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4278 | IL1RAPL1 | Ain Roesley reviewed gene: IL1RAPL1: Rating: GREEN; Mode of pathogenicity: None; Publications: 34452636, 27470653, 21484992, 18801879, 18801879; Phenotypes: Intellectual developmental disorder, X-linked 21 MIM#300143; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females; Current diagnostic: yes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4264 | CDKL5 | Zornitza Stark Mode of inheritance for gene: CDKL5 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4263 | CDKL5 | Zornitza Stark reviewed gene: CDKL5: Rating: GREEN; Mode of pathogenicity: None; Publications: 19793311; Phenotypes: Developmental and epileptic encephalopathy 2, MIM# 300672; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4260 | DDX3X | Zornitza Stark Mode of inheritance for gene: DDX3X was changed from X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4260 | DDX3X | Zornitza Stark Mode of inheritance for gene: DDX3X was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4259 | DDX3X | Zornitza Stark reviewed gene: DDX3X: Rating: GREEN; Mode of pathogenicity: None; Publications: 30266093, 26235985, 25533962, 33528536, 30936465, 31274575, 30817323; Phenotypes: Intellectual developmental disorder, X-linked, syndrome, Snijders Blok type MIM# 300958; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4244 | NUP85 |
Zornitza Stark gene: NUP85 was added gene: NUP85 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: NUP85 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: NUP85 were set to 34170319; 30179222 Phenotypes for gene: NUP85 were set to Intellectual disability Review for gene: NUP85 was set to AMBER Added comment: Bi-allelic variants in this gene are associated with nephrotic syndrome in 3 families. Phenotype expansion: PMID: 34170319 - Ravindran et al 2021 report two pedigrees with an MCPH-SCKS phenotype spectrum without SRNS. In the first family, a 9 yo female, with consanguineous parents, is reported to have a missense variant in NUP85 (c.932G > A; p.R311Q). Intrauterine growth restriction was noticed. At birth microcephaly was observed (OFC < 3rd centile, < −3.6 SD) as well as hypotrophy [weight −2.8 SD), length 45 cm (−2.7 SD), both <3rd centile], facial dysmorphism, syndactyly, long and thin fingers, and bilateral pes adductus. She has severe developmental delay with strongly delayed motor milestones and absent speech. Drug-resistant, genetic epilepsy with focal-onset seizures started in the first year of life. She had no clinical, laboratory or radiological findings indicative of kidney dysfunction. In the second family, compound heterozygous missense variants in NUP85 were detected (c.1109A > G, c.1589 T > C;p.N370S, p.M530T ) in a fetus. MRI of the fetal brain at 24 + 2 GW indicated complete agenesis of the corpus callosum, abnormal sulcation in the left frontal lobe, nodularity of the frontal horn and trigone with focal puckering of the left lateral ventricle. PMID: 30179222 - Braun et al 2018 - 2 individuals from 1 of the families reported with steroid-resistant nephrotic syndrome were also reported to have intellectual disability but showed no structural brain defects. The degree of intellectual disability is not stated. They were found to have 2 compound heterozygous alleles (c.405+1G>A and c.1741G>C, p.Ala581Pro) in NUP85. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4236 | SPRED2 | Zornitza Stark Phenotypes for gene: SPRED2 were changed from developmental delay; intellectual disability; cardiac defects; short stature; skeletal anomalies; a typical facial gestalt to Rasopathy; developmental delay; intellectual disability; cardiac defects; short stature; skeletal anomalies; a typical facial gestalt | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4233 | SPRED2 |
Dean Phelan gene: SPRED2 was added gene: SPRED2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: SPRED2 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: SPRED2 were set to PMID: 34626534 Phenotypes for gene: SPRED2 were set to developmental delay; intellectual disability; cardiac defects; short stature; skeletal anomalies; a typical facial gestalt Review for gene: SPRED2 was set to GREEN Added comment: PMID: 34626534 Homozygosity for three different variants c.187C>T (p.Arg63∗), c.299T>C (p.Leu100Pro), and c.1142_1143delTT (p.Leu381Hisfs∗95) were identified in four subjects from three families. All variants severely affected protein stability, causing accelerated degradation, and variably perturbed SPRED2 functional behaviour. The clinical phenotype of the four affected individuals included developmental delay, intellectual disability, cardiac defects, short stature, skeletal anomalies, and a typical facial gestalt as major features, without the occurrence of the distinctive skin signs characterizing Legius syndrome. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4231 | PHF6 | Zornitza Stark Mode of inheritance for gene: PHF6 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4230 | PHF6 | Zornitza Stark reviewed gene: PHF6: Rating: GREEN; Mode of pathogenicity: None; Publications: 16912705; Phenotypes: Borjeson-Forssman-Lehmann syndrome, MIM# 301900; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4171 | WIPI2 | Zornitza Stark Phenotypes for gene: WIPI2 were changed from Intellectual developmental disorder with short stature and variable skeletal anomalies 618453 to Intellectual developmental disorder with short stature and variable skeletal anomalies 618453; global developmental delay; intellectual disability; refractory infantile/childhood-onset epilepsy; progressive tetraplegia with joint contractures; dyskinesia; speech and visual impairment; autistic features; ataxic gait | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4167 | ZDHHC15 | Zornitza Stark Mode of inheritance for gene: ZDHHC15 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4166 | ZDHHC15 | Zornitza Stark reviewed gene: ZDHHC15: Rating: RED; Mode of pathogenicity: None; Publications: 34345675, 32989326; Phenotypes: Mental retardation, X-linked 91, 300577; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4162 | ATP11A |
Elena Savva gene: ATP11A was added gene: ATP11A was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: ATP11A was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: ATP11A were set to PMID: 34403372 Phenotypes for gene: ATP11A were set to Neurological disorder Mode of pathogenicity for gene: ATP11A was set to Other Review for gene: ATP11A was set to AMBER Added comment: PMID: 34403372: - Single de novo missense variant reported in a patient with developmental delay and neurological deterioration. - Patient MRI showed severe cerebral atrophy, ventriculomegaly, hypomyelination leukodystrophy, thinned corpus callosum. Axonal neuropathy suggested. - K/I heterozygous mice died perinatally. - Functional studies on missense variant show plasma membrane lipid content impairment, reduced ATPase activity etc. gnomAD: some NMD PTCs present, good quality variants found with 4-5 hets. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4162 | ERBB4 |
Ain Roesley gene: ERBB4 was added gene: ERBB4 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: ERBB4 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: ERBB4 were set to 33603162 Penetrance for gene: ERBB4 were set to unknown Review for gene: ERBB4 was set to GREEN Added comment: CNVs reported only exonic deletions: 3x families with ID, speech delays, aggressive outbursts (including 1x de novo) 1x family with global dev delay inherited from unaffected parent exonic del with limited clinical info: 1x severe expressive language delay Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4156 | RNF113A | Zornitza Stark reviewed gene: RNF113A: Rating: GREEN; Mode of pathogenicity: None; Publications: 31880405; Phenotypes: Trichothiodystrophy 5, nonphotosensitive, OMIM #300953; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4156 | RNF113A | Zornitza Stark Mode of inheritance for gene: RNF113A was changed from X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4150 | CDH15 | Elena Savva reviewed gene: CDH15: Rating: RED; Mode of pathogenicity: Other; Publications: PMID: 19012874, 12052883, 28422132, 26506440; Phenotypes: Mental retardation, autosomal dominant 3 MIM#612580; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4148 | CPE | Zornitza Stark edited their review of gene: CPE: Added comment: Bosch et al. 2021 (PMID: 34383079) reported on 4 individuals from 3 additional families harbouring 2 different homozygous truncating variants in this gene. Clinical presentation was prominent for obesity and intellectual disability. Hypogonadotropic hypogonadism was confirmed in one individual and was suspected but not tested for in another two subjects.; Changed rating: GREEN; Changed publications: 26120850, 32936766, 34383079; Changed phenotypes: Intellectual developmental disorder and hypogonadotropic hypogonadism, MIM# 619326 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4146 | HCFC1 | Zornitza Stark Mode of inheritance for gene: HCFC1 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4145 | HCFC1 | Zornitza Stark reviewed gene: HCFC1: Rating: GREEN; Mode of pathogenicity: None; Publications: 34164576, 24011988; Phenotypes: Mental retardation, X-linked 3 (methylmalonic acidaemia and homocysteinaemia, cblX type) MIM# 309541; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4134 | ZC4H2 | Zornitza Stark Mode of inheritance for gene: ZC4H2 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4133 | ZC4H2 | Zornitza Stark reviewed gene: ZC4H2: Rating: GREEN; Mode of pathogenicity: None; Publications: 23623388, 34322088, 33949289, 31885220, 31206972; Phenotypes: Wieacker-Wolff syndrome, MIM# 314580; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4127 | BCAP31 | Zornitza Stark Mode of inheritance for gene: BCAP31 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4126 | BCAP31 | Zornitza Stark reviewed gene: BCAP31: Rating: GREEN; Mode of pathogenicity: None; Publications: 24011989, 31330203, 33603160; Phenotypes: Deafness, dystonia, and cerebral hypomyelination, MIM# 300475; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4112 | MTR | Zornitza Stark Phenotypes for gene: MTR were changed from to Homocystinuria-megaloblastic anaemia, cblG complementation type, MIM# 250940 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4109 | MTR | Zornitza Stark reviewed gene: MTR: Rating: GREEN; Mode of pathogenicity: None; Publications: 8968736, 8968737, 9683607, 12068375; Phenotypes: Homocystinuria-megaloblastic anaemia, cblG complementation type, MIM# 250940; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4085 | WDR11 | Zornitza Stark Phenotypes for gene: WDR11 were changed from to Intellectual disability; Microcephaly; Short stature | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4081 | WDR11 | Konstantinos Varvagiannis reviewed gene: WDR11: Rating: AMBER; Mode of pathogenicity: None; Publications: 34413497; Phenotypes: Intellectual disability, Microcephaly, Short stature; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4079 | FGD1 | Zornitza Stark Mode of inheritance for gene: FGD1 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4078 | FGD1 | Zornitza Stark reviewed gene: FGD1: Rating: GREEN; Mode of pathogenicity: None; Publications: 7954831, 20082460; Phenotypes: Aarskog-Scott syndrome, MIM # 305400, Mental retardation, X-linked syndromic 16, MIM# 305400; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4070 | ZNF699 |
Zornitza Stark gene: ZNF699 was added gene: ZNF699 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: ZNF699 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: ZNF699 were set to 33875846 Phenotypes for gene: ZNF699 were set to DEGCAGS syndrome, MIM# 619488 Review for gene: ZNF699 was set to GREEN Added comment: DEGCAGS syndrome is a neurodevelopmental disorder characterized by global developmental delay, coarse and dysmorphic facial features, and poor growth and feeding apparent from infancy. Affected individuals have variable systemic manifestations often with significant structural defects of the cardiovascular, genitourinary, gastrointestinal, and/or skeletal systems. Additional features may include sensorineural hearing loss, hypotonia, anaemia or pancytopaenia, and immunodeficiency with recurrent infections. 12 unrelated families reported, 5 different homozygous frameshift variants. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4059 | RNF220 |
Konstantinos Varvagiannis changed review comment from: Sferra et al (2021 - PMID: 33964137) provide extensive evidence that biallelic RNF220 mutations cause a disorder characterized by hypomyelinating leukodystrophy, ataxia (9/9 - onset 1-5y), borderline intellectual functioning (3/9) / intellectual disability (5/9 - in most cases mild), sensorineural deafness (9/9) with complete hearing loss in the first decade of life, hepatopathy (9/9) with associated periportal fibrosis, and dilated cardiomyopathy (9/9) which was fatal. Other neurologic manifestations apart from ataxia incl. hyperreflexia (8/8), spastic paraplegia (9/9), dysarthria (9/9), peripheral neuropathy (4/9), seizures in one case (1/9). Upon brain MRI there was thin corpus callosum (9/9) or cerebellar atrophy in some (2/9). The authors identified homozygosity for 2 recurrent missense RNF220 variants in affected members belonging to these 5 broad consanguineous pedigrees (7 families), namely NM_018150.4:c.1094G>A / p.Arg365Gly in 4 Roma families in the context of a shared haplotype (/founder effect) as well as c.1088G>A / p.Arg363Gly in a large pedigree from southern Italy initially reported by Leuzzi et al (2000 - PMID: 10881263). Extensive segregation analyses were carried out including several affected and unaffected members. RNF220 encodes ring finger protein 220, which functions as an E3 ubiquitin ligase. Previous studies have shown among others a role in modulation of Sonic hedgehog/GLI signaling and cerebellar development Evidence for the role of RNF220 included relevant expression, localization within the cell, interaction partners (lamin B1, 20S proteasome), similarities with other laminopathies in terms of phenotype, etc : *RNF220 has a relevant expression pattern in CNS (based on qRT-PCR analyses in human brain, cerebellum, cerebral cortex / mRNA levels in human fetal CNS with higher expression in cerebellum, spinal cord and cortex / previous GTEx data / protein levels in mouse CNS) *The protein displays nuclear localization based on iPSC cells differentiated to motor neurons (also supported by data from the Human Protein Atlas). Transfection of COS-1 cells demonstrated localization primarily to the nucleus (as also previously demonstrated in HEK293T cells) in vesicle like structures with ASF2/SF2 colocalization suggesting enrichment in nuclear speckles. There was also partial co-distribution with the 20S proteasome. R363Q and R365Q additionally coalesced in the cytoplasm forming protein aggregates/inclusions. *Immunofluorescence studies in patient fibroblasts also confirmed abnormal increase of the protein in the cytoplasm and increased fluorescence with the 20S proteasome. *Proteomic identification of RNF220-interacting proteins in transfected HEK293T cells demonstrated enrichment for all members of the lamin protein family (incl . lamin B1, AC, B2). *RNAi-mediated downregulation of RNF222 in Drosophila suggested altered subcellular localization and accumulation of the fly orthologue for human lamin B1. *Immunoprecipitation of lamin B1 from the nuclear matrix of cerebellar cells suggested significant interaction of endogenous lamin B1 with RNF220, while transfection studies in HEK293T cells for wt/mt suggested reduced binding to endogenous lamin B1 for RNF220 mt compared to wt (more prominent for R365Q). RNF220 mutants also reduced ubiquitination of nuclear lamin B1 compared to wt. *Patient fibroblasts immunostained with different nuclear envelope markers displayed abnormal nuclear shapes with multiple invaginations and lobulations, findings also observed in laminopathies. There is currently no associated phenotype in OMIM or G2P. SysID includes RNF220 among the current primary ID genes. Sources: Literature, Other; to: Sferra et al (2021 - PMID: 33964137) provide extensive evidence that biallelic RNF220 mutations cause a disorder characterized by hypomyelinating leukodystrophy, ataxia (9/9 - onset 1-5y), borderline intellectual functioning (3/9) / intellectual disability (5/9 - in most cases mild), sensorineural deafness (9/9) with complete hearing loss in the first decade of life, hepatopathy (9/9) with associated periportal fibrosis, and dilated cardiomyopathy (9/9) which was fatal. Other neurologic manifestations apart from ataxia incl. hyperreflexia (8/8), spastic paraplegia (9/9), dysarthria (9/9), peripheral neuropathy (4/9), seizures in one case (1/9). Upon brain MRI there was thin corpus callosum (9/9) or cerebellar atrophy in some (2/9). The authors identified homozygosity for 2 recurrent missense RNF220 variants in affected members belonging to these 5 broad consanguineous pedigrees (7 families), namely NM_018150.4:c.1094G>A / p.Arg365Gly in 4 Roma families in the context of a shared haplotype (/founder effect) as well as c.1088G>A / p.Arg363Gly in a large pedigree from southern Italy initially reported by Leuzzi et al (2000 - PMID: 10881263). Extensive segregation analyses were carried out including several affected and unaffected members. RNF220 encodes ring finger protein 220, which functions as an E3 ubiquitin ligase. Previous studies have shown among others a role in modulation of Sonic hedgehog/GLI signaling and cerebellar development Evidence for the role of RNF220 included relevant expression, localization within the cell, interaction partners (lamin B1, 20S proteasome), similarities with other laminopathies in terms of phenotype, etc : *RNF220 has a relevant expression pattern in CNS (based on qRT-PCR analyses in human brain, cerebellum, cerebral cortex / mRNA levels in human fetal CNS with higher expression in cerebellum, spinal cord and cortex / previous GTEx data / protein levels in mouse CNS) *The protein displays nuclear localization based on iPSC cells differentiated to motor neurons (also supported by data from the Human Protein Atlas). Transfection of COS-1 cells demonstrated localization primarily to the nucleus (as also previously demonstrated in HEK293T cells) in vesicle like structures with ASF2/SF2 colocalization suggesting enrichment in nuclear speckles. There was also partial co-distribution with the 20S proteasome. R363Q and R365Q additionally coalesced in the cytoplasm forming protein aggregates/inclusions. *Immunofluorescence studies in patient fibroblasts also confirmed abnormal increase of the protein in the cytoplasm and increased fluorescence with the 20S proteasome. *Proteomic identification of RNF220-interacting proteins in transfected HEK293T cells demonstrated enrichment for all members of the lamin protein family (incl . lamin B1, AC, B2). *RNAi-mediated downregulation of RNF222 in Drosophila suggested altered subcellular localization and accumulation of the fly orthologue for human lamin B1. *Immunoprecipitation of lamin B1 from the nuclear matrix of cerebellar cells suggested significant interaction of endogenous lamin B1 with RNF220, while transfection studies in HEK293T cells for wt/mt suggested reduced binding to endogenous lamin B1 for RNF220 mt compared to wt (more prominent for R365Q). RNF220 mutants also reduced ubiquitination of nuclear lamin B1 compared to wt. *Patient fibroblasts immunostained with different nuclear envelope markers displayed abnormal nuclear shapes with multiple invaginations and lobulations, findings also observed in laminopathies. There is currently no associated phenotype in OMIM or G2P. SysID includes RNF220 among the current primary ID genes. Consider inclusion in panels for leukodystrophies, childhood onset ataxia, sensorineural hearing loss, corpus callosum anomalies, cardiomyopathies, hepatopathies, etc in all cases with green rating. Sources: Literature, Other |
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| Intellectual disability syndromic and non-syndromic v0.4059 | RNF220 |
Konstantinos Varvagiannis gene: RNF220 was added gene: RNF220 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature,Other Mode of inheritance for gene: RNF220 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: RNF220 were set to 33964137; 10881263 Phenotypes for gene: RNF220 were set to Leukodystrophy; CNS hypomyelination; Ataxia; Intellectual disability; Sensorineural hearing impairment; Elevated hepatic transaminases; Hepatic fibrosis; Dilated cardiomyopathy; Spastic paraplegia; Dysarthria; Abnormality of the corpus callosum Penetrance for gene: RNF220 were set to Complete Review for gene: RNF220 was set to GREEN Added comment: Sferra et al (2021 - PMID: 33964137) provide extensive evidence that biallelic RNF220 mutations cause a disorder characterized by hypomyelinating leukodystrophy, ataxia (9/9 - onset 1-5y), borderline intellectual functioning (3/9) / intellectual disability (5/9 - in most cases mild), sensorineural deafness (9/9) with complete hearing loss in the first decade of life, hepatopathy (9/9) with associated periportal fibrosis, and dilated cardiomyopathy (9/9) which was fatal. Other neurologic manifestations apart from ataxia incl. hyperreflexia (8/8), spastic paraplegia (9/9), dysarthria (9/9), peripheral neuropathy (4/9), seizures in one case (1/9). Upon brain MRI there was thin corpus callosum (9/9) or cerebellar atrophy in some (2/9). The authors identified homozygosity for 2 recurrent missense RNF220 variants in affected members belonging to these 5 broad consanguineous pedigrees (7 families), namely NM_018150.4:c.1094G>A / p.Arg365Gly in 4 Roma families in the context of a shared haplotype (/founder effect) as well as c.1088G>A / p.Arg363Gly in a large pedigree from southern Italy initially reported by Leuzzi et al (2000 - PMID: 10881263). Extensive segregation analyses were carried out including several affected and unaffected members. RNF220 encodes ring finger protein 220, which functions as an E3 ubiquitin ligase. Previous studies have shown among others a role in modulation of Sonic hedgehog/GLI signaling and cerebellar development Evidence for the role of RNF220 included relevant expression, localization within the cell, interaction partners (lamin B1, 20S proteasome), similarities with other laminopathies in terms of phenotype, etc : *RNF220 has a relevant expression pattern in CNS (based on qRT-PCR analyses in human brain, cerebellum, cerebral cortex / mRNA levels in human fetal CNS with higher expression in cerebellum, spinal cord and cortex / previous GTEx data / protein levels in mouse CNS) *The protein displays nuclear localization based on iPSC cells differentiated to motor neurons (also supported by data from the Human Protein Atlas). Transfection of COS-1 cells demonstrated localization primarily to the nucleus (as also previously demonstrated in HEK293T cells) in vesicle like structures with ASF2/SF2 colocalization suggesting enrichment in nuclear speckles. There was also partial co-distribution with the 20S proteasome. R363Q and R365Q additionally coalesced in the cytoplasm forming protein aggregates/inclusions. *Immunofluorescence studies in patient fibroblasts also confirmed abnormal increase of the protein in the cytoplasm and increased fluorescence with the 20S proteasome. *Proteomic identification of RNF220-interacting proteins in transfected HEK293T cells demonstrated enrichment for all members of the lamin protein family (incl . lamin B1, AC, B2). *RNAi-mediated downregulation of RNF222 in Drosophila suggested altered subcellular localization and accumulation of the fly orthologue for human lamin B1. *Immunoprecipitation of lamin B1 from the nuclear matrix of cerebellar cells suggested significant interaction of endogenous lamin B1 with RNF220, while transfection studies in HEK293T cells for wt/mt suggested reduced binding to endogenous lamin B1 for RNF220 mt compared to wt (more prominent for R365Q). RNF220 mutants also reduced ubiquitination of nuclear lamin B1 compared to wt. *Patient fibroblasts immunostained with different nuclear envelope markers displayed abnormal nuclear shapes with multiple invaginations and lobulations, findings also observed in laminopathies. There is currently no associated phenotype in OMIM or G2P. SysID includes RNF220 among the current primary ID genes. Sources: Literature, Other |
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| Intellectual disability syndromic and non-syndromic v0.4058 | ARF3 |
Konstantinos Varvagiannis gene: ARF3 was added gene: ARF3 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: ARF3 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: ARF3 were set to 34346499 Phenotypes for gene: ARF3 were set to Global developmental delay; Intellectual disability; Seizures; Morphological abnormality of the central nervous system Penetrance for gene: ARF3 were set to unknown Added comment: Sakamoto et al (2021 - PMID: 34346499) provide some evidence that monoallelic ARF3 pathogenic variants may be associated with a NDD with brain abnormality. Using trio exome sequencing, the authors identified 2 individuals with NDD harboring de novo ARF3 variants, namely: NM_001659.2:c.200A>T / p.Asp67Val and c.296G>T / p.Arg99Leu. Individual 1 (with Asp67Val / age : 4y10m), appeared to be more severelely affected with prenatal onset progressive microcephaly, severe global DD, epilepsy. Upon MRI there was cerebellar and brainstem atrophy. Individual 2 (Arg99Leu / 14y) had severe DD and ID (IQ of 23), epilepsy and upon MRI cerebellar hypoplasia. This subject did not exhibit microcephaly. Common facial features incl. broad nose, full cheeks, small philtrum, strabismus, thin upper lips and abnormal jaw. There was no evidence of systemic involvement in both. ARF3 encodes ADP-ribosylation factor 3. Adenosine diphosphate ribosylation factors (ARFs) are key proteins for regulation of cargo sorting at the Golgi network, with ARF3 mainly working at the trans-Golgi network. ARFs belong to the small GTP-binding protein (G protein) superfamily. ARF3 switches between an active GTP-bound form and an inactive GDP-bound form, regulated by guanine nucleotide exchange factors (GEFs) and GTPase activating proteins (GAPs) respectively. Members of the ARF superfamily regulate various aspects of membrane traffic, among others in neurons. There are 5 homologs of ARF families, divided in 3 classes. ARF3 and ARF1 belong to class I. Monoallelic ARF1 mutations are associated with Periventricular nodular heterotopia 8 (MIM 618185). In vivo, in vitro and in silico studies for the 2 variants suggest that both impair the Golgi transport system although each variant most likely exerts a different effect (gain-of-function for Arg99Leu vs loss-of-function/dominant-negative for Asp67Val). This was also reflected in somewhat different phenotype of the subjects with the respective variants. Common features included severe DD, epilepsy and brain abnormalities although Asp67Val was associated with diffuse brain atrophy as well as congenital microcephaly and Arg99Leu with cerebellar hypoplasia. Evidence to support the effect of each variant include: Arg99Leu: Had identical Golgi localization to that of wt Had increased binding activity with GGA1, a protein recruited by the GTP-bound active form of ARF3 to the TGN membrane (supporting GoF) In silico structural analysis suggested it may fail to stabilize the conformation of Asp26, resulting in impaired GTP hydrolysis (GoF). In transgenic fruit flies, evaluation of the ARF3 variant toxicity using the rough eye phenotype this variant was associated with increased severity of the r-e phenotype similar to a previously studied GoF variant (Gln71Leu) Asp67Val: Did not show a Golgi-like pattern of localization (similar to Thr31Asn a previously studied dominant-negative variant) Displayed decreased protein stability In silico structural analysis suggested that Asp67Val may lead to compromised binding of GTP or GDP (suggestive of LoF) In transgenic Drosophila eye-specific expression of Asp67Val (similar to Thr31Asn, a known dominant-negative variant) was lethal possibly due to high toxicity in very small amounts in tissues outside the eye. There is no associated phenotype in OMIM, G2P or SysID. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4053 | PLXNA2 |
Konstantinos Varvagiannis gene: PLXNA2 was added gene: PLXNA2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature,Other Mode of inheritance for gene: PLXNA2 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: PLXNA2 were set to 34327814 Phenotypes for gene: PLXNA2 were set to Intellectual disability; Abnormality of the face; Failure to thrive; Abnormal heart morphology Penetrance for gene: PLXNA2 were set to Incomplete Review for gene: PLXNA2 was set to AMBER Added comment: Altuame et al (2021 - PMID: 34327814) describe 3 individuals from 2 consanguineous Arab families with biallelic PLXNA2 variants. The index patient from the 1st family presented with CHD (hypoplastic right ventricle, ASD), DD and moderate ID (IQ of 40), failure to thrive as well as some dysmorphic features (obtuse mandibular angle, mild overbite, synophrys with downslanting p-f, strabismus, etc). There were additional features (eg. postaxial polydactyly) which were found in other affected and unaffected family members. Exome sequencing with autozygome analysis revealed homozygosity for a PLXNA2 stopgain variant (NM_025179:c.3603C>A / p.(Cys1201*)). Sanger confirmation was carried out and segregation analyses confirmed carrier status of the unaffected parents and a sib as well as a brother homozygous for the same variant. Clinical evaluation of the latter, following this finding revealed borderline intellectual functioning, ADHD, failure to thrive. There was no mandibular anomaly or overbite and no clinical evidence of CHD (no echo performed). The index patient from the 2nd consanguineous family was evaluated for ID (IQ of 63), with previous borderline motor development, ADHD and some dysmorphic features (obtuse mandibular angle and overbite). There was no clinical evidence of CHD (no echo performed). Exome sequencing with autozygosity mapping revealed a homozygous missense PLXNA2 variant (c.3073G>A / p.(Asp1025Asn), present only once in gnomAD (htz), with rather non-concordant in silico predictions SIFT 0.22, PolyPhen 0.682 and CADD 23.5. The aa was however highly conserved. Segregation analysis confirmed carrier state of the parents and 2 unaffected sibs, with a 3rd sib homozygous for the wt allele. As the authors discuss: *PLXNA2 belongs to the plexin family of genes, encoding transmbembrane proteins functioning as semaphorin receptors. It has predominant expression in neural tissue. The protein is thought to bind semaphorin-3A, -3C or -5 followed by plexin A2 dimerization, activation of its GTPase-activating protein domain, negative regulation of Rap1B GTPase and initiation of a signal transduction cascade mediating axonal repulsion/guidance, dendritic guidance, neuronal migration. *Murine Plxna2 knockout models display structural brain defects. In addition they display congenital heart defects incl. persistent truncus arteriosus and interrupted aortic arch. *Rare CNVs in adult humans with tetralogy of Fallot have suggested a potential role of PLXNA2 in cardiac development and CHD. *Expression and the role of PLXNA2 in human chondrocytes as well as a GWAS in 240 japanese patients with mandibular prognathism where PLXNA2 was suggested as a susceptibility locus. Overall, the authors recognize some common features (as for cognitive functioning, some dysmorphic features incl. obtuse mandibular angle and overbite in 2 unrelated subjects, failure to thrive 3/3) and provide plausible explanations for the variability / discordance of others eg: - Cyanotic heart disease explaining discordance in cognitive outcome among sibs - Incomplete penetrance for CHD (and/or ID or mandibular anomaly) as for few AR disorders and/or - Additional pathogenic variants possibly explaining the CHD in the first subject. There is no associated phenotype in OMIM or G2P. SysID includes PLXNA2 among the candidate ID genes. Sources: Literature, Other |
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| Intellectual disability syndromic and non-syndromic v0.4051 | VPS50 |
Konstantinos Varvagiannis gene: VPS50 was added gene: VPS50 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: VPS50 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: VPS50 were set to 34037727 Phenotypes for gene: VPS50 were set to Neonatal cholestatic liver disease; Failure to thrive; Profound global developmental delay; Postnatal microcephaly; Seizures; Abnormality of the corpus callosum Penetrance for gene: VPS50 were set to Complete Review for gene: VPS50 was set to AMBER Added comment: Schneeberger et al (2021 - PMID: 34037727) describe the phenotype of 2 unrelated individuals with biallelic VPS50 variants. Common features included transient neonatal cholestasis, failure to thrive, severe DD with failure to achieve milestones (last examination at 2y and 2y2m respectively), postnatal microcephaly, seizures (onset at 6m and 25m) and irritability. There was corpus callosum hypoplasia on brain imaging. Both individuals were homozygous for variants private to each family (no/not known consanguinity applying to each case). The first individual was homozygous for a splicing variant (NM_017667.4:c.1978-1G>T) and had a similarly unaffected sister deceased with no available DNA for testing. The other individual was homozygous for an in-frame deletion (c.1823_1825delCAA / p.(Thr608del)). VPS50 encodes a critical component of the endosome-associated recycling protein (EARP) complex, which functions in recycling endocytic vesicles back to the plasma membrane [OMIM based on Schindler et al]. The complex contains VPS50, VPS51, VPS52, VPS53, the three latter also being components of GARP (Golgi-associated-retrograde protein) complex. GARP contains VPS54 instead of VPS50 and is required for trafficking of proteins to the trans-golgi network. Thus VPS50 (also named syndetin) and VPS54 function in the EARP and GARP complexes, to define directional movement of their endocytic vesicles [OMIM based on Schindler et al]. The VPS50 subunit is required for recycling of the transferrin receptor. As discussed by Schneeberger et al (refs provided in text): - VPS50 has a high expression in mouse and human brain as well as throughout mouse brain development. - Mice deficient for Vps50 have not been reported. vps50 knockdown in zebrafish results in severe developmental defects of the body axis. Knockout mice for other proteins of the EARP/GARP complex (e.g. Vps52, 53 and 54) display embryonic lethality. Studies performed by Schneeberger et al included: - Transcript analysis for the 1st variant demonstrated skipping of ex21 (in patient derived fabriblasts) leading to an in frame deletion of 81 bp (r.1978_2058del) with predicted loss of 27 residues (p.Leu660_Leu686del). - Similar VPS50 mRNA levels but significant reduction of protein levels (~5% and ~8% of controls) were observed in fibroblasts from patients 1 and 2. Additionally, significant reductions in the amounts of VPS52 and VPS53 protein levels were observed despite mRNA levels similar to controls. Overall, this suggested drastic reduction of functional EARP complex levels. - Lysosomes appeared to have similar morphology, cellular distribution and likely unaffected function in patient fibroblasts. - Transferrin receptor recycling was shown to be delayed in patient fibroblasts suggestive of compromise of endocytic-recycling function. As the authors comment, the phenotype of both individuals with biallelic VPS50 variants overlaps with the corresponding phenotype reported in 15 subjects with biallelic VPS53 or VPS51 mutations notably, severe DD/ID, microcephaly and early onset epilepsy, CC anomalies. Overall, for this group, they propose the term "GARP and/or EARP deficiency disorders". There is no VPS50-associated phenotype in OMIM or G2P. SysID includes VPS50 among the ID candidate genes. Consider inclusion in other relevant gene panels (e.g. for neonatal cholestasis, epilepsy, microcephaly, growth failure in early infancy, corpus callosum anomalies, etc) with amber rating pending further reports. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4043 | TCF7L2 | Konstantinos Varvagiannis reviewed gene: TCF7L2: Rating: AMBER; Mode of pathogenicity: None; Publications: 34003604; Phenotypes: Global developmental delay, Intellectual disability, Autism, Attention deficit hyperactivity disorder, Myopia, Abnormality of skeletal system; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4041 | JAKMIP1 |
Seb Lunke gene: JAKMIP1 was added gene: JAKMIP1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: JAKMIP1 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: JAKMIP1 were set to 29158550; 26627310; 27799067 Phenotypes for gene: JAKMIP1 were set to Intellectual disability; Seizures Review for gene: JAKMIP1 was set to AMBER Added comment: Identified in two independent patients in the literature with a mouse model. Patient 1 (27799067) with developmental delay, speech delay, and cognitive impairment; self-injurious and aggressive behaviour, seizures, dysmorphic features. De-novo missense JAKMIP1 (p.D586H). Patient 2 (29158550) with feeding difficulties, hypotonia, epilepsy, severe ID, no active speech, kyphoscoliosis, constipation, autism, short stature. Splice variant c.1432-2A>G, no segregation or RNA data available. KO mouse model (27799067) displays social deficits, stereotyped activity, abnormal postnatal vocalizations, and other autistic-like behaviors. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4040 | PIDD1 |
Konstantinos Varvagiannis gene: PIDD1 was added gene: PIDD1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: PIDD1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: PIDD1 were set to 28397838; 29302074; 33414379; 34163010 Phenotypes for gene: PIDD1 were set to Global developmental delay; Intellectual disability; Seizures; Autism; Behavioral abnormality; Psychosis; Pachygyria; Lissencephaly; Abnormality of the corpus callosum Penetrance for gene: PIDD1 were set to Complete Review for gene: PIDD1 was set to GREEN Added comment: There is enough evidence to include this gene in the current panel with green rating. Biallelic PIDD1 pathogenic variants have been reported in 26 individuals (11 families) with DD (all), variable degrees of ID (mild to severe), behavioral (eg. aggression/self-mutilation in several, ADHD) and/or psychiatric abnormalities (ASD, psychosis in 5 belonging to 3 families), well-controlled epilepsy is some (9 subjects from 6 families) and MRI abnormalities notably abnormal gyration pattern (pachygyria with predominant anterior gradient) as well as corpus callosum anomalies (commonly thinning) in several. Dysmorphic features have been reported in almost all, although there has been no specific feature suggested. The first reports on the phenotype associated with biallelic PIDD1 mutations were made by Harripaul et al (2018 - PMID: 28397838) and Hu et al (2019 - PMID: 29302074) [both studies investigating large cohorts of individuals with ID from consanguineous families]. Sheikh et al (2021 - PMID: 33414379) provided details on the phenotype of 15 individuals from 5 families including those from the previous 2 reports and studied provided evidence on the role of PIDD1 and the effect of variants. Zaki et al (2021 - PMID: 34163010) reported 11 additional individuals from 6 consanguineous families, summarize the features of all subjects published in the literature and review the neuroradiological features of the disorder. PIDD1 encodes p53-induced death domain protein 1. The protein is part of the PIDDosome, a multiprotein complex also composed of the bipartite linker protein CRADD (also known as RAIDD) and the proform of caspase-2 and induces apoptosis in response to DNA damage. There are 5 potential PIDD1 mRNA transcript variants with NM_145886.4 corresponding to the longest. Similar to the protein encoded by CRADD, PIDD1 contains a death domain (DD - aa 774-893). Constitutive post-translational processing gives PIDD1-N, PIDD1-C the latter further processed into PIDD1-CC (by auto-cleavage). Serine residues at pos. 446 and 588 are involved in this autoprocessing generating PIDD1-C (aa 446-910) and PIDD1-CC (aa 774-893). The latter is needed for caspase-2 activation. Most (if not all) individuals belonged to consanguineous families of different origins and harbored pLoF or missense variants. Variants reported so far include : c.2587C>T; p.Gln863* / c.1909C>T ; p.Arg637* / c.2443C>T / p.Arg815Trp / c.2275-1G>A which upon trap assay was shown to lead to skipping of ex15 with direct splicing form exon14 to the terminal exon 16 (resulting to p.Arg759Glyfs*1 with exlcusion of the entire DD) / c.2584C>T; p.Arg862Trp / c.1340G>A; p.Trp447* / c.2116_2120del; p.Val706His*, c.1564_1565del; p.Gly602fs*26 Evidence so far provided includes: - Biallelic CRADD variants cause a NDD disorder and a highly similar gyration pattern. - Confirmation of splicing effect (eg. for c.2275-1G>A premature stop in position 760) or poor expression (NM_145886.3:c.2587C>T; p.Gln863*). Arg815Trp did not affect autoprocessing or protein stability. - Abnormal localization pattern, loss of interaction with CRADD and failure to activate caspase-2 (MDM2 cleavage assay) [p.Gln863* and Arg815Trp] - Available expression data from GTEx (PIDD1 having broad expression in multiple tissues, but higher in brain cerebellum) as well as BrainSpan and PsychEncode studies suggesting high coexpression of PIDD1, CRADD and CASP2 in many regions in the developing human brain. - Variants in other genes encoding proteins interacting with PIDD1 (MADD, FADD, DNAJ, etc) are associated with NDD. Pidd-1 ko mice (ex3-15 removal) lack however CNS-related phenotypes. These show decreased anxiety but no motor anomalies. This has also been the case with Cradd-/- mice displaying no significant CNS phenotypes without lamination defects. There is currently no associated phenotype in OMIM, PanelApp Australia. PIDD1 is listed in the DD panel of G2P (PIDD1-related NDD / biallelic / loss of function / probable) . SysID includes PIDD1 among the current primary ID genes. Overall the gene appears to be relevant for the epilepsy panel, panels for gyration and/or corpus callosum anomalies etc. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4020 | CLCN3 |
Zornitza Stark gene: CLCN3 was added gene: CLCN3 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: CLCN3 was set to BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal Publications for gene: CLCN3 were set to 34186028 Phenotypes for gene: CLCN3 were set to Neurodevelopmental disorder Mode of pathogenicity for gene: CLCN3 was set to Other Review for gene: CLCN3 was set to GREEN Added comment: 11 individuals reported, 9 that carried 8 different rare heterozygous missense variants in CLCN3, and 2 siblings that were homozygous for an NMD-predicted frameshift variant likely abolishing ClC-3 function. All missense variants were confirmed to be de novo in eight individuals for whom parental data was available. The 11 individuals in the cohort share clinical features of variable severity. All 11 have GDD or ID and dysmorphic features, and a majority has mood or behavioural disorders and structural brain abnormalities: - Structural brain abnormalities on MRI (9/11) included partial or full agenesis of the corpus callosum (6/9), disorganized cerebellar folia (4/9), delayed myelination (3/9), decreased white matter volume (3/9), pons hypoplasia (3/9), and dysmorphic dentate nuclei (3/9). Six of those with brain abnormalities also presented with seizures. - Nine have abnormal vision, including strabismus in four and inability to fix or follow in the two with homozygous loss-of-function variants. - Hypotonia ranging from mild to severe was reported in 7 of the 11 individuals. - Six have mood or behavioural disorders, particularly anxiety (3/6). - Consistent dysmorphic facial features included microcephaly, prominent forehead, hypertelorism, down-slanting palpebral fissures, full cheeks, and micrognathia. The severity of disease in the two siblings with homozygous disruption of ClC-3 is consistent with the drastic phenotype seen in Clcn3 KO mice. The disease was more severe in two siblings carrying homozygous loss-of-function variants with the presence of GDD, absent speech, seizures, and salt and pepper fundal pigmentation in both individuals, with one deceased at 14 months of age. The siblings also had significant neuroanatomical findings including diffusely decreased white matter volume, thin corpora callosa, small hippocampi, and disorganized cerebellar folia. Supporting biallelic inheritance for LoF variants, disruption of mouse Clcn3 results in drastic neurodegeneration with loss of the hippocampus a few months after birth and early retinal degeneration. Clcn3−/− mice display severe neurodegeneration, whereas heterozygous Clcn3+/− mice appear normal. Patch-clamp studies were used to investigate four of the missense variants. These suggested a gain of function in two variants with increased current in HEK cells, however they also showed reduced rectification of voltage and a loss of transient current, plus decreased current amplitude, glycosylation and surface expression when expressed in oocytes, and were suspected to interfere with channel gating and a negative feedback mechanism. These effects were also shown to vary depending on pH levels. The current of the remaining two variants did not differ from WT. For heterozygous missense variants, the disruption induced may be at least partially conferred to mutant/WT homodimers and mutant/ClC-4 heterodimers. Both loss and gain of function in this gene resulted in the same phenotype. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4017 | TNPO2 |
Elena Savva gene: TNPO2 was added gene: TNPO2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: TNPO2 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: TNPO2 were set to PMID: 34314705 Phenotypes for gene: TNPO2 were set to Developmental delays, neurologic deficits and dysmorphic features Mode of pathogenicity for gene: TNPO2 was set to Other Review for gene: TNPO2 was set to GREEN Added comment: PMID: 34314705 - all de novo missense variants with intellectual disability (9/9), speech impairment (15/15), motor impairment (15/15), ophthalmologic abnormalities (10/15), muscle tone abnormalities (11/15, primarily hypotonia), seizures (6/15, febrile to non-febrile), microcephaly (5/15) and MRI anomalies (7/13, 3/13 had cerebellar hypoplasia/dysplasia). Null fly model was homozygous lethal, no obvious phenotypes in heterozygotes. Upregulated gene expression also resulted in lethality. Overexpression of some human variants in fly models resulted in "toxicity" and phenotypic defects, authors speculate two variants are GOF, 1 variant is LOF. gnomAD: minimal PTCs present Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4015 | SPTBN1 |
Belinda Chong gene: SPTBN1 was added gene: SPTBN1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: SPTBN1 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: SPTBN1 were set to PMID: 34211179 PMID: 33847457 Phenotypes for gene: SPTBN1 were set to Neurodevelopmental Syndrome Review for gene: SPTBN1 was set to GREEN Added comment: PMID: 34211179 - Heterozygous SPTBN1 variants in 29 individuals with developmental, language and motor delays; mild to severe intellectual disability; autistic features; seizures; behavioral and movement abnormalities; hypotonia; and variable dysmorphic facial features. - Show that these SPTBN1 variants lead to effects that affect βII-spectrin stability, disrupt binding to key molecular partners, and disturb cytoskeleton organization and dynamics. PMID: 33847457 - Common features include global developmental delays, intellectual disability, and behavioral disturbances. Autistic features (4/6) and epilepsy (2/7) or abnormal electroencephalogram without overt seizures (1/7) were present in a subset. - identified seven unrelated individuals with heterozygous SPTBN1 variants: two with de novo missense variants and five with predicted loss-of-function variants (found to be de novo in two, while one was inherited from a mother with a history of learning disabilities). - Identification of loss-of-function variants suggests a haploinsufficiency mechanism, but additional functional studies are required to fully elucidate disease pathogenesis. Sources: Literature Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4002 | SYNCRIP |
Konstantinos Varvagiannis gene: SYNCRIP was added gene: SYNCRIP was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: SYNCRIP was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: SYNCRIP were set to 34157790; 30504930; 27479843; 23020937 Phenotypes for gene: SYNCRIP were set to Global developmental delay; Intellectual disability; Autism; Myoclonic atonic seizures; Abnormality of nervous system morphology Review for gene: SYNCRIP was set to AMBER Added comment: Semino et al (2021 - PMID: 34157790) provide clinical details on 3 unrelated individuals with de novo SYNCRIP variants and provide a review of 5 additional subjects previously identified within large cohorts in the literature and databases. Features included DD, ID (7/7 for whom this information was available), ASD or autistic features (4/7). MRI abnormalities were observed in 3 (widening of CSF spaces, periventricular nodular heterotopia, prominent lat. ventricles). Epilepsy (myoclonic-astatic epilepsy / Doose syndrome) was reported for 2(/8) individuals. The 3 patients here reported were identified following trio/singleton exome with Sanger confirmation of the variants and their de novo occurrence. Variants are in almost all cases de novo (7/7 for whom this was known) and in 5/8 cases were pLoF, in 2/8 missense SNVs while a case from DECIPHER had a 77.92 kb whole gene deletion not involving other genes with unknown inheritance. Overall the variants reported to date include [NM_006372.5]: 1 - c.858_859del p.(Gly287Leufs*5) 2 - c.854dupA p.(Asn285Lysfs*8) 3 - c.734T>C p.(Leu245Pro) 4 - chr6:85605276-85683190 deletion (GRCh38) 5 - c.629T>C p.(Phe210Ser) 6 - c.1573_1574delinsTT p.(Gln525Leu) 7 - c.1247_1250del p.(Arg416Lysfs*145) 8 - c.1518_1519insC p.(Ala507Argfs*14) [P1-3: this report, P4: DECIPHER 254774, P5-6: Guo et al 2019 - PMID: 30504930, P7: Lelieveld et al 2016 - PMID: 27479843, P8: Rauch et al 2012 - PMID: 23020937 / all other Refs not here reviewed, clinical details summarized by Semino et al in table 1] SYNCRIP (also known as HNRNPQ) encodes synaptotagmin‐binding cytoplasmic RNA‐interacting protein. As the authors note, this RNA-binding protein is involved in multiple pathways associated with neuronal/muscular developmental disorders. Several references are provided for its involvement in regulation of RNA metabolism, among others sequence recognition, pre-mRNA splicing, translation, transport and degradation. Mutations in other RNA-interacting proteins and hnRNP members (e.g. HNRNPU, HNRNPD) are associated with NDD. The missense variant (p.Leu245Pro) is within RRM2 one of the 3 RNA recognition motif (RRM) domains of the protein. These 3 domains, corresponding to the central part of the protein (aa 150-400), are relatively intolerant to variation (based on in silico predictions and/or variation in gnomAD). Leu245 localizes within an RNA binding pocket and in silico modeling suggests alteration of the tertiary structure and RNA-binding capacity of RRM2. There are no additional studies performed. Overall haploinsufficiency appears to be the underlying disease mechanism based on the truncating variants and the gene deletion. [pLI in gnomAD : 1, %HI : 2.48%] Animal models are not discussed. There is no associated phenotype in OMIM. This gene is included in the DD panel of G2P (monoallelic LoF variants / SYNCRIP-related developmental disorder). SysID also lists SYNCRIP within the current primary ID genes. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.4001 | CAMK4 |
Konstantinos Varvagiannis gene: CAMK4 was added gene: CAMK4 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature,Other Mode of inheritance for gene: CAMK4 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: CAMK4 were set to 30262571; 33098801; 33211350 Phenotypes for gene: CAMK4 were set to Global developmental delay; Intellectual disability; Autism; Behavioral abnormality; Abnormality of movement; Dystonia; Ataxia; Chorea; Myoclonus Penetrance for gene: CAMK4 were set to Complete Review for gene: CAMK4 was set to GREEN Added comment: 3 publications by Zech et al (2018, 2020 - PMIDs : 30262571, 33098801, 33211350) provide clinical details on 3 individuals, each harboring a private de novo CAMK4 variant. Overlapping features included DD, ID, behavoral issues, autism and abnormal hyperkinetic movements. Dystonia and chorea in all 3 appeared 3-20 years after initial symptoms. CAMK4 encodes Calcium/Calmodulin-dependent protein kinase IV, an important mediator of calcium-mediated activity and dynamics, particularly in the brain. It is involved in neuronal transmission, synaptic plasticity, and neuronal gene expression required for brain development and neuronal homeostasis (summary by OMIM based on Zech et al, 2018). The 473 aa enzyme has a protein kinase domain (aa 46-300) and a C-terminal autoregulatory domain (aa 305-341) the latter comprising an autoinhibitory domain (AID / aa 305-321) and a calmodulin-binding domain (CBD / aa 322-341) [NP_001735.1 / NM_001744.4 - also used below]. Variants in all 3 subjects were identified following trio-WES and were in all cases protein-truncating, mapping to exon 10 or exon 10-intron 10 junction, expected to escape NMD and cause selective abrogation of the autoinhibitory domain (aa 305-321) leading overall to gain-of-function. Variation databases include pLoF CAMK4 variants albeit in all cases usptream or downstream of this region (pLI of this gene in gnomAD: 0.51). Variants leading to selective abrogation of the autoregulatory domain have not been reported. Extensive evidence for the GoF effect of the variant has been provided in the first publication. Several previous studies have demonstrated that abrogation of the AID domain leads to consitutive activation (details below). Mouse models - though corresponding to homozygous loss of function - support a role for CAMKIV in cognitive and motor symptoms. Null mice display tremulous and ataxic movements, deficiencies in balance and sensorimotor performance associated with reduced number of Purkinje neurons (Ribar et al 2000, PMID: 11069976 - not reviewed). Wei et al (2002, PMID: 12006982 - not reviewed) provided evidence for alteration in hippocampal physiology and memory function. Heterozygous mutations in other genes for calcium/calmodulin-dependent protein kinases (CAMKs) e.g. CAMK2A/CAMK2B (encoding subunits of CAMKII) have been reported in individuals with ID. --- The proband in the first publication (PMID: 30262571) was a male with DD, ID, behavioral difficulties (ASD, autoaggression, stereotypies) and hyperkinetic movement disorder (myoclonus, chorea, ataxia) with severe generalized dystonia (onset at the age of 13y). Brain MRI demonstrated cerebellar atrophy. Extensive work-up incl. karyotyping, CMA, DYT-TOR1A, THAP1, GCH1, SCA1/2/3/6/7/8/12/17, Friedreich's ataxia and FMR1 analysis was negative.F Trio WES identified a dn splice site variant (c.981+1G>A) in the last exon-intron junction. RT-PCR followed by gel electrophoresis and Sanger in fibroblasts from an affected and control subject revealed that the proband had - as predicted by the type/location of the variant - in equal amount 2 cDNA products, a normal as well as a truncated one. Sequencing of the shortest revealed utilization of a cryptic donor splice site upstream of the mutated donor leading to a 77bp out-of-frame deletion and introduction of a premature stop codon in the last codon (p.Lys303Serfs*28). Western blot in fibroblast cell lines revealed 2 bands corresponding to the normal protein product as well as to the p.Lys303Serfs*28 although expression of the latter was lower than that of the full length protein. Several previous studies have shown that mutant CAMKIV species that lack the autoinhibitory domain are consitutively active (several Refs provided). Among others Chatila et al (1996, PMID: 8702940) studied an in vitro-engineered truncation mutant (Δ1-317 - truncation at position 317 of the protein) with functionally validated gain-of-function effect. To prove enhanced activity of the splicing variant, Zech et al assessed phosphorylation of CREB (cyclic AMP-responsive element binding protein), a downstream substrate of CAMKIV. Immunobloting revealed significant increase of CREB phosphorylation in patient fibroblasts compared to controls. Overactivation of CAMKIV signaling was reversed when cells were treated with STO-609 an inhibitor of CAMKK, the ustream activator of CAMKIV. Overall the authors demonstrated that loss of CAMKIV autoregulatory domain due to this splice variant had a gain-of-function effect. ---- Following trio-WES, Zech et al (2020 - PMID: 33098801) identified another relevant subject within cohort of 764 individuals with dystonia. This 12-y.o. male, harboring a different variant affecting the same donor site (c.981+1G>T), presented DD, ID, dystonia (onset at 3y) and additional movement disorders (myoclonus, ataxia) as well as similar behavior (ASD, autoaggression, stereotypies). [Details in suppl. p20]. ---- Finally Zech et al (2020 - PMID: 33211350) reported on a 24-y.o. woman with adolescence onset choreodystonia. Other features included DD, moderate ID, absence seizures in infancy, OCD with anxiety and later diagnosis of ASD. Trio WES revealed a dn stopgain variant (c.940C>T; p.Gln314*). ---- There is no associated phenotype in OMIM, G2P. In SysID CAMK4 is listed among the current primary ID genes. ---- Please consider inclusion in other relevant panels. Sources: Literature, Other |
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| Intellectual disability syndromic and non-syndromic v0.3995 | WDR26 | Paul De Fazio reviewed gene: WDR26: Rating: GREEN; Mode of pathogenicity: None; Publications: 28686853, 33506510, 33675273; Phenotypes: Skraban-Deardorff syndrome; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown; Current diagnostic: yes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3978 | IMPDH2 |
Laura Raiti gene: IMPDH2 was added gene: IMPDH2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: IMPDH2 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: IMPDH2 were set to PMID: 33098801 Added comment: 6 unrelated individuals 1x individual in a dystonia cohort index case with infancy-onset dystonia and other neurological manifestations with a de-novo missense variant, c.338G>A (p.Gly113Glu) in IMPDH2, predicted to disrupt an invariant residue within the cystathionine-β-synthase (CBS) domain pair of the encoded protein. IMPDH2 encodes IMPDH2, a key enzyme in the purine biosynthetic pathway, expressed throughout the brain and not linked previously to any human Mendelian condition. 1x individual with a de-novo substitution, c.337G>A (p.Gly113Arg), was found in in-house whole-exome sequencing data from 500 individuals with neurodevelopmental disorders. Through GeneMatcher, de novo variants identified: 3 x missense: c.729G>C (p.Gln243His), c.619G>C (p.Gly207Arg), and c.619G>A (p.Gly207Arg) 1 x deletion: c.478_480delTCC (p.Ser160del) The six variants were predicted to be deleterious and none of them seen in control databases. All affected conserved amino acids and resided in and around the cystathionine-β-synthase domain pair. The described variants are situated in and around the CBS domain pair, a regulatory element in which clustering of pathogenic missense variants has already been shown for the homologue of IMPDH2, IMPDH1. The variant carriers shared similar neurodevelopmental phenotypes. Apart from the dystonia cohort index case, one participant had evidence of dystonic posturing. Modelling of the variants on 3D protein structures revealed spatial clustering near specific functional sites, predicted to result in deregulation of IMPDH2 activity. Additionally, thermal-shift assays showed that the c.619G>A (p.Gly207Arg) variant, identified as within the CBS domain pair, and c.729G>C (p.Gln243His), which is in close vicinity, affected the stability or folding behaviour of IMPDH2. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3974 | KDM3B | Zornitza Stark Phenotypes for gene: KDM3B were changed from Intellectual disability; dysmorphic features; short stature; no OMIM number yet to Diets-Jongmans syndrome, MIM# 618846; Intellectual disability; dysmorphic features; short stature | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3973 | KDM3B | Zornitza Stark reviewed gene: KDM3B: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Diets-Jongmans syndrome, MIM# 618846, Intellectual disability, dysmorphic features, short stature, Intellectual disability, short stature, deafness; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3967 | RING1 |
Zornitza Stark gene: RING1 was added gene: RING1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: RING1 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: RING1 were set to 29386386 Phenotypes for gene: RING1 were set to microcephaly; intellectual disability Review for gene: RING1 was set to RED Added comment: Not associated with any phenotype in OMIM. PMID: 29386386 - Pierce et al 2018 - report a 13 yo female with a de novo RING1 p.R95Q variant and syndromic neurodevelopmental disabilities. Early motor and language development were normal but were delayed after the first year of life. Cognitive testing showed a verbal IQ of 55 and a visual performance IQ of 63. Head circumference at birth was -4.9 SD, and -4.2 SD at age 13 which falls into the severe microcephaly category. C. elegans with either the missense mutation or complete knockout of spat-3 (the suggested RING1 ortholog) were defective in monoubiquitylation of histone H2A and had defects in neuronal migration and axon guidance. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3952 | ERGIC3 |
Seb Lunke gene: ERGIC3 was added gene: ERGIC3 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: ERGIC3 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: ERGIC3 were set to ERGIC3 Phenotypes for gene: ERGIC3 were set to 33710394; 31585110 Review for gene: ERGIC3 was set to AMBER Added comment: PMID: 33710394 - two homozygous sibs with mild ID, a novel canonical splice (c.717+1G>A). Absent in gnomAD, no splice studies. Classed as a VUS. PMID: 31585110 - 1 hom (p.Gln233Argfs*10) in a male 8yo with Growth retardation, Microcephaly, Learning disability, Facial dysmorphism, Abnormal pigmentation. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3938 | GNB2 | Arina Puzriakova reviewed gene: GNB2: Rating: GREEN; Mode of pathogenicity: None; Publications: 31698099, 33971351, 34183358; Phenotypes: Intellectual disability; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3921 | MYT1 |
Paul De Fazio gene: MYT1 was added gene: MYT1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: MYT1 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: MYT1 were set to 33710394 Phenotypes for gene: MYT1 were set to Intellectual disability Review for gene: MYT1 was set to RED gene: MYT1 was marked as current diagnostic Added comment: Missense variant reported de novo in a patient with mild ID. Patient also had a COL9A2 variant and skeletal features. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3921 | SAMD9L |
Paul De Fazio gene: SAMD9L was added gene: SAMD9L was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: SAMD9L was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Phenotypes for gene: SAMD9L were set to Intellectual disability Review for gene: SAMD9L was set to RED gene: SAMD9L was marked as current diagnostic Added comment: Missense variant reported de novo in a patient with moderate ID, in a large cohort study. Author described it as a phenotype expansion as ataxia-pancytopenia not found in that patient. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3919 | ARHGEF9 | Zornitza Stark Mode of inheritance for gene: ARHGEF9 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3918 | ARHGEF9 | Zornitza Stark reviewed gene: ARHGEF9: Rating: GREEN; Mode of pathogenicity: None; Publications: 31942680, 30048823, 29130122, 28620718, 33600053, 32939676; Phenotypes: Developmental and epileptic encephalopathy 8, MIM# 300607; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3885 | ARCN1 | Zornitza Stark Phenotypes for gene: ARCN1 were changed from to Short stature, rhizomelic, with microcephaly, micrognathia, and developmental delay (MIM#617164) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3882 | ARCN1 | Zornitza Stark reviewed gene: ARCN1: Rating: GREEN; Mode of pathogenicity: None; Publications: 27476655, 33154040; Phenotypes: Short stature, rhizomelic, with microcephaly, micrognathia, and developmental delay (MIM#617164); Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3862 | FARSA |
Chirag Patel gene: FARSA was added gene: FARSA was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: FARSA was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: FARSA were set to PMID: 33598926 Phenotypes for gene: FARSA were set to Rajab interstitial lung disease with brain calcifications 2 Review for gene: FARSA was set to GREEN gene: FARSA was marked as current diagnostic Added comment: FARSA is a subunit with FARSB to form FARS1 enzyme. Bi-allelic mutations in FARSB are well described. Schuch et al. (2021) report 3 unrelated individuals with bi-allelic variants in FARSA. Identified through WES and variants segregated with disease. Functional evidence was obtained with reduced FARS1 enzyme activity levels in fibroblasts or EBV-transformed lymphoblastoid cell lines (EBV-LCLs) of patients. Common to all was a chronic interstitial lung disease starting early in life and characterized by bilateral ground-glass opacification on HR-CT, and cholesterol pneumonitis in lung histology. Additional abnormalities in other organ systems include liver disease, neurological manifestations, and growth restriction. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3859 | ZNF81 | Zornitza Stark Mode of inheritance for gene: ZNF81 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3857 | ZNF81 | Zornitza Stark reviewed gene: ZNF81: Rating: RED; Mode of pathogenicity: None; Publications: 15121780; Phenotypes: Intellectual disability; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3847 | LTBP1 |
Chern Lim changed review comment from: PMID:33991472 - Premature truncating variants in multiple affected individuals from 4 unrelated consanguineous families. - Affected individuals present with connective tissue features (cutis laxa and inguinal hernia), craniofacial dysmorphology, variable heart defects, and prominent skeletal features (craniosynostosis, short stature, brachydactyly, and syndactyly). - Most of the affected individuals have developmental delay and other neurological features. - Functional studies done on patient fibroblasts and zebrafish models. Sources: Literature; to: PMID:33991472 - Premature truncating variants in multiple affected individuals from 4 unrelated consanguineous families. - Affected individuals present with connective tissue features (cutis laxa and inguinal hernia), craniofacial dysmorphology, variable heart defects, and prominent skeletal features (craniosynostosis, short stature, brachydactyly, and syndactyly). - Most of the affected individuals have developmental delay and other neurological features. - Functional studies done on patient fibroblasts and zebrafish models. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3847 | LTBP1 |
Chern Lim gene: LTBP1 was added gene: LTBP1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: LTBP1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: LTBP1 were set to 33991472 Phenotypes for gene: LTBP1 were set to cutis laxa syndrome Review for gene: LTBP1 was set to GREEN gene: LTBP1 was marked as current diagnostic Added comment: PMID:33991472 - Premature truncating variants in multiple affected individuals from 4 unrelated consanguineous families. - Affected individuals present with connective tissue features (cutis laxa and inguinal hernia), craniofacial dysmorphology, variable heart defects, and prominent skeletal features (craniosynostosis, short stature, brachydactyly, and syndactyly). - Most of the affected individuals have developmental delay and other neurological features. - Functional studies done on patient fibroblasts and zebrafish models. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3845 | BCAS3 |
Paul De Fazio gene: BCAS3 was added gene: BCAS3 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: BCAS3 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: BCAS3 were set to 34022130 Phenotypes for gene: BCAS3 were set to Syndromic neurodevelopmental disorder Review for gene: BCAS3 was set to GREEN gene: BCAS3 was marked as current diagnostic Added comment: 15 individuals from eight unrelated families with germline bi-allelic loss-of-function variants in BCAS3. All probands share a global developmental delay accompanied by pyramidal tract involvement, microcephaly, short stature, strabismus, dysmorphic facial features, and seizures. Patient fibroblasts confirmed absence of BCAS3 protein. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3845 | SRCAP | Paul De Fazio reviewed gene: SRCAP: Rating: GREEN; Mode of pathogenicity: None; Publications: 33909990; Phenotypes: Floating-Harbor syndrome MIM#136140; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown; Current diagnostic: yes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3838 | SLC9A6 | Zornitza Stark Mode of inheritance for gene: SLC9A6 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3837 | SLC9A6 | Zornitza Stark reviewed gene: SLC9A6: Rating: GREEN; Mode of pathogenicity: None; Publications: 18342287, 19377476, 25044251, 33278113, 32569089, 31879735; Phenotypes: Mental retardation, X-linked syndromic, Christianson type, MIM# 300243, MONDO:0010278; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3823 | IQSEC2 | Zornitza Stark Mode of inheritance for gene: IQSEC2 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3786 | UFSP2 |
Konstantinos Varvagiannis changed review comment from: Ni et al (2021 - PMID: 33473208) describe the phenotype of 8 children (belonging to 4 families - 2 of which consanguineous) homozygous for a UFSP2 missense variant [NM_018359.5:c.344T>A; p.(Val115Glu)]. Members of a broader consanguineous pedigree from Pakistan with 3 affected children with epilepsy and DD and ID underwent exome sequencing. All affected individuals were homozygous for the specific SNV with their parents (2 parent pairs, in both cases first cousins) being heterozygous. An unaffected sib was homozygous for the wt allele. Through genematching platforms 3 additional families with similarly affected individuals and homozygosity for the same variant were recruited. These additional families were from Pakistan (1/3) and Afganistan (2/3). Based on ROH analysis from the broader first pedigree and an additional family the authors concluded on a single shared region of homozygosity on chr 4q. Lack of ES data did not allow verification of whether 2/4 families shared the same haplotype with the other 2. The authors calculated the probability of the genotype-phenotype cosegragation occurring by chance (0.009) and this was lower than the recommended criterion (0.06) for strong evidence of pathogenicity. Shared features included abnormal tone in most (hypotonia 6/8, limb hypertonia 1/8), seizures (8/8 - onset 2d - 7m), severe DD with speech delay/absent speech (8/8), ID (8/8), strabismus (6/8). UFSP2 encodes UFM1-specific protease 2 involved in UFmylation, a post-translational protein modification. As summarized by the authors the cysteine protease encoded by this gene (as is also the case for UFSP1) cleaves UFM1 in the initial step of UFMylation. Apart from producing mature UFM1, the 2 proteases have also the ability to release UFM1 from UFMylated proteins, in the process of de-UFMylation. [several refs. provided] UFMylation is important in brain development with mutations in genes encoding other components of the pathway reported in other NDD disorders (incl. UFM1, UBA5, UFC1). Additional studies were carried to provide evidence for pathogenicity of this variant. Skin biopsies from 3 individuals were carried out to establish fibroblast cultures. Immunoblotting revealed reduced UFSP2 levels relative to controls. mRNA levels measured by qRT-PCR revealed no differences compared to controls altogether suggesting normal mRNA but reduced protein stability. The authors demonstrated increased levels of UFM1-conjugated proteins (incl. DDRGK1, or TRIP4). Ectopic expression of wt UFSP2 normalized the levels of UFMylated proteins in the fibroblasts which was not the case for the V115E variant. Further the variant was difficult to detect by immunoblotting consistent with an effect on protein destabilization. Although disruption of UFMylation induces ER stress, this was not shown to occur in patient fibroblast lines, when assessed for ER stress markers. Evaluation of data from the GTEx project, concerning UFSP2 as well as well as DDRGK1 or TRIP4 - an UFMylation target - revealed relevant expression in multiple regions of the human brain. Overall the authors provide evidence for defective de-UFMylation in patient fibroblasts (presence of increased UFMylation marks). The authors stress out that the effect of the variant in UFMylation in brain is unknown, as UFSP1 or other enzymes might compensate in the presence of hypomorphic UFSP2 mutants. Biallelic UFSP2 variants have previously been reported in 2 skeletal dysplasias [# 142669. BEUKES HIP DYSPLASIA; BHD and # 617974. SPONDYLOEPIMETAPHYSEAL DYSPLASIA, DI ROCCO TYPE; SEMDDR]. These disorders are not characterized by neurological dysfunction or epilepsy. The authors underscore the fact that variants identified in these disorders (Y290H, D526A, H428R) localize within the C-terminal catalytic (peptidase) domain [aa 278 – 461] while the variant here identified lies in the N-terminal substrate binding domain affecting protein stability/abundance. In OMIM, only the 2 aforementioned disorders are currently associated with biallelic UFSP2 mutations. There is no associated phenotype in G2P. SysID includes UFSP2 among the primary ID genes. You may consider inclusion in the current panel with amber/green rating. Sources: Literature; to: Ni et al (2021 - PMID: 33473208) describe the phenotype of 8 children (belonging to 4 families - 2 of which consanguineous) homozygous for a UFSP2 missense variant [NM_018359.5:c.344T>A; p.(Val115Glu)]. Members of a broader consanguineous pedigree from Pakistan with 3 affected children with epilepsy and DD and ID underwent exome sequencing. All affected individuals were homozygous for the specific SNV with their parents (2 parent pairs, in both cases first cousins) being heterozygous. An unaffected sib was homozygous for the wt allele. Through genematching platforms 3 additional families with similarly affected individuals and homozygosity for the same variant were recruited. These additional families were from Pakistan (1/3) and Afganistan (2/3). Based on ROH analysis from the broader first pedigree and an additional family the authors concluded on a single shared region of homozygosity on chr 4q. Lack of ES data did not allow verification of whether 2/4 families shared the same haplotype with the other 2. The authors calculated the probability of the genotype-phenotype cosegragation occurring by chance (0.009) and this was lower than the recommended criterion (0.06) for strong evidence of pathogenicity. Shared features included abnormal tone in most (hypotonia 6/8, limb hypertonia 1/8), seizures (8/8 - onset 2d - 7m), severe DD with speech delay/absent speech (8/8), ID (8/8), strabismus (6/8). UFSP2 encodes UFM1-specific protease 2 involved in UFmylation, a post-translational protein modification. As summarized by the authors the cysteine protease encoded by this gene (as is also the case for UFSP1) cleaves UFM1 in the initial step of UFMylation. Apart from producing mature UFM1, the 2 proteases have also the ability to release UFM1 from UFMylated proteins, in the process of de-UFMylation. [several refs. provided] UFMylation is important in brain development with mutations in genes encoding other components of the pathway reported in other NDD disorders (incl. UFM1, UBA5, UFC1). Additional studies were carried to provide evidence for pathogenicity of this variant. Skin biopsies from 3 individuals were carried out to establish fibroblast cultures. Immunoblotting revealed reduced UFSP2 levels relative to controls. mRNA levels measured by qRT-PCR revealed no differences compared to controls altogether suggesting normal mRNA but reduced protein stability. The authors demonstrated increased levels of UFM1-conjugated proteins (incl. DDRGK1, or TRIP4). Ectopic expression of wt UFSP2 normalized the levels of UFMylated proteins in the fibroblasts which was not the case for the V115E variant. Further the variant was difficult to detect by immunoblotting consistent with an effect on protein destabilization. Although disruption of UFMylation induces ER stress, this was not shown to occur in patient fibroblast lines, when assessed for ER stress markers. Evaluation of data from the GTEx project, concerning UFSP2 as well as well as DDRGK1 or TRIP4 - an UFMylation target - revealed relevant expression in multiple regions of the human brain. Overall the authors provide evidence for defective de-UFMylation in patient fibroblasts (presence of increased UFMylation marks). The authors stress out that the effect of the variant in UFMylation in brain is unknown, as UFSP1 or other enzymes might compensate in the presence of hypomorphic UFSP2 mutants. **Monoallelic** (correction to previous review) UFSP2 variants have previously been reported in 2 skeletal dysplasias [# 142669. BEUKES HIP DYSPLASIA; BHD and # 617974. SPONDYLOEPIMETAPHYSEAL DYSPLASIA, DI ROCCO TYPE; SEMDDR]. These disorders are not characterized by neurological dysfunction or epilepsy. The authors underscore the fact that variants identified in these disorders (Y290H, D526A, H428R) localize within the C-terminal catalytic (peptidase) domain [aa 278 – 461] while the variant here identified lies in the N-terminal substrate binding domain affecting protein stability/abundance. In OMIM, only the 2 aforementioned disorders are currently associated with biallelic UFSP2 mutations. There is no associated phenotype in G2P. SysID includes UFSP2 among the primary ID genes. You may consider inclusion in the current panel with amber/green rating. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3785 | UFSP2 |
Konstantinos Varvagiannis gene: UFSP2 was added gene: UFSP2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: UFSP2 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: UFSP2 were set to 33473208 Phenotypes for gene: UFSP2 were set to Abnormal muscle tone; Seizures; Global developmental delay; Delayed speech and language development; Intellectual disability; Strabismus Penetrance for gene: UFSP2 were set to Complete Review for gene: UFSP2 was set to AMBER Added comment: Ni et al (2021 - PMID: 33473208) describe the phenotype of 8 children (belonging to 4 families - 2 of which consanguineous) homozygous for a UFSP2 missense variant [NM_018359.5:c.344T>A; p.(Val115Glu)]. Members of a broader consanguineous pedigree from Pakistan with 3 affected children with epilepsy and DD and ID underwent exome sequencing. All affected individuals were homozygous for the specific SNV with their parents (2 parent pairs, in both cases first cousins) being heterozygous. An unaffected sib was homozygous for the wt allele. Through genematching platforms 3 additional families with similarly affected individuals and homozygosity for the same variant were recruited. These additional families were from Pakistan (1/3) and Afganistan (2/3). Based on ROH analysis from the broader first pedigree and an additional family the authors concluded on a single shared region of homozygosity on chr 4q. Lack of ES data did not allow verification of whether 2/4 families shared the same haplotype with the other 2. The authors calculated the probability of the genotype-phenotype cosegragation occurring by chance (0.009) and this was lower than the recommended criterion (0.06) for strong evidence of pathogenicity. Shared features included abnormal tone in most (hypotonia 6/8, limb hypertonia 1/8), seizures (8/8 - onset 2d - 7m), severe DD with speech delay/absent speech (8/8), ID (8/8), strabismus (6/8). UFSP2 encodes UFM1-specific protease 2 involved in UFmylation, a post-translational protein modification. As summarized by the authors the cysteine protease encoded by this gene (as is also the case for UFSP1) cleaves UFM1 in the initial step of UFMylation. Apart from producing mature UFM1, the 2 proteases have also the ability to release UFM1 from UFMylated proteins, in the process of de-UFMylation. [several refs. provided] UFMylation is important in brain development with mutations in genes encoding other components of the pathway reported in other NDD disorders (incl. UFM1, UBA5, UFC1). Additional studies were carried to provide evidence for pathogenicity of this variant. Skin biopsies from 3 individuals were carried out to establish fibroblast cultures. Immunoblotting revealed reduced UFSP2 levels relative to controls. mRNA levels measured by qRT-PCR revealed no differences compared to controls altogether suggesting normal mRNA but reduced protein stability. The authors demonstrated increased levels of UFM1-conjugated proteins (incl. DDRGK1, or TRIP4). Ectopic expression of wt UFSP2 normalized the levels of UFMylated proteins in the fibroblasts which was not the case for the V115E variant. Further the variant was difficult to detect by immunoblotting consistent with an effect on protein destabilization. Although disruption of UFMylation induces ER stress, this was not shown to occur in patient fibroblast lines, when assessed for ER stress markers. Evaluation of data from the GTEx project, concerning UFSP2 as well as well as DDRGK1 or TRIP4 - an UFMylation target - revealed relevant expression in multiple regions of the human brain. Overall the authors provide evidence for defective de-UFMylation in patient fibroblasts (presence of increased UFMylation marks). The authors stress out that the effect of the variant in UFMylation in brain is unknown, as UFSP1 or other enzymes might compensate in the presence of hypomorphic UFSP2 mutants. Biallelic UFSP2 variants have previously been reported in 2 skeletal dysplasias [# 142669. BEUKES HIP DYSPLASIA; BHD and # 617974. SPONDYLOEPIMETAPHYSEAL DYSPLASIA, DI ROCCO TYPE; SEMDDR]. These disorders are not characterized by neurological dysfunction or epilepsy. The authors underscore the fact that variants identified in these disorders (Y290H, D526A, H428R) localize within the C-terminal catalytic (peptidase) domain [aa 278 – 461] while the variant here identified lies in the N-terminal substrate binding domain affecting protein stability/abundance. In OMIM, only the 2 aforementioned disorders are currently associated with biallelic UFSP2 mutations. There is no associated phenotype in G2P. SysID includes UFSP2 among the primary ID genes. You may consider inclusion in the current panel with amber/green rating. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3777 | THOC2 | Zornitza Stark Mode of inheritance for gene: THOC2 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3776 | THOC2 | Paul De Fazio reviewed gene: THOC2: Rating: GREEN; Mode of pathogenicity: None; Publications: 26166480, 32116545, 29851191, 32960281; Phenotypes: Mental retardation, X-linked 12/35 MIM#300957; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females; Current diagnostic: yes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3771 | SMARCA5 |
Zornitza Stark gene: SMARCA5 was added gene: SMARCA5 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: SMARCA5 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: SMARCA5 were set to 33980485 Phenotypes for gene: SMARCA5 were set to Neurodevelopmental disorder; microcephaly; dysmorphic features Review for gene: SMARCA5 was set to GREEN Added comment: 12 individuals reported with either de novo or appropriately segregating variants in this gene and mild developmental delay, frequent postnatal short stature and microcephaly, and recurrent dysmorphic features. Functional data supports gene-disease association. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3758 | RALA | Zornitza Stark Phenotypes for gene: RALA were changed from Intellectual disability; short stature; dysmorphism to Hiatt-Neu-Cooper neurodevelopmental syndrome, MIM# 619311; Intellectual disability; short stature; dysmorphism | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3757 | RALA | Zornitza Stark edited their review of gene: RALA: Changed phenotypes: Hiatt-Neu-Cooper neurodevelopmental syndrome, MIM# 619311, Intellectual disability, short stature, dysmorphism | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3753 | TMEM222 |
Konstantinos Varvagiannis gene: TMEM222 was added gene: TMEM222 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: TMEM222 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: TMEM222 were set to 33824500 Phenotypes for gene: TMEM222 were set to Motor delay; Delayed speech and language development; Intellectual disability; Generalized hypotonia; Broad-based gait; Abnormality of nervous system morphology; Seizures; Microcephaly; Behavioral abnormality Penetrance for gene: TMEM222 were set to Complete Review for gene: TMEM222 was set to GREEN Added comment: Polla et al (2021 - PMID: 33824500) report 17 individuals from 9 unrelated families, with biallelic TMEM222 pathogenic variants. The phenotype included motor, speech delay and moderate to severe ID (as universal features). Other manifestations included hypotonia (10/15), broad gait (5/12), seizures (7/17 - belonging to 6/9 families), MRI abnormalities (5/8). Variable behavioral abnormalities were observed (aggressive behavior, shy character, stereotypic movements etc). Abnormal OFC was a feature in several with microcephaly in 7 subjects from 4 families (measurements not available for all 17). Nonspecific facial features were reported in 10/17. Rare features incl. body tremors, decreased lower extremity muscle mass or disorder of motor neurons. TMEM222 variants were identified following exome sequencing. Previous investigations incl. metabolic studies, FMR1, chromosomes by standard karyotype or CMA, SMA, CMT1A were reported to be normal (available for some individuals). TMEM222 variants missense and pLoF ones mostly found in homozygosity (7/9 families were consanguineous, compound heterozygosity reported in a single case from the 9 families). Sanger sequencing was used for confirmation of variants, parental carrier state as well as testing of sibs (unaffected sibs tested in 4 families). Few individuals had additional genetic findings in other genes, though classified as VUS (3 families). The gene encodes transmembrane protein 222 (208 residues) which however has unknown function. The protein comprises 3 transmembrane domains and a domain of unknown function. TMEMs are a group of transmembrane proteins spanning membranes with - most commonly - unclear function. The authors measured expression by qPCR mRNA analysis, demonstrating highest fetal and adult brain expression (incl. parietal and occipital cortex). Expression levels from GTEx data also support a role in neurodevelopment. Immunocytochemistry revealed highest levels in mature human iPSC-derived glutaminergic cortical neurons and moderate in immature ones. Additional studies supported that the gene is highly expressed in dendrites and might play a role in postsynaptic vesicles (colocalization with postsynaptic and early endosomal markers). A previous study by Riazuddin et al (2017 - PMID: 27457812) had identified TMEM222 as a candidate gene for ID. This family (PKMR213) however appears to be included as family 2 in the aforementioned publication (same pedigree, variant and phenotype in both articles). In OMIM there is currently no associated phenotype. The gene is listed among the primary ID genes in SysID. Please consider inclusion in the ID panel with green (or amber) rating. This gene may also be included in other panels e.g. for epilepsy, microcephaly, etc. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3745 | SIN3B | Zornitza Stark Mode of inheritance for gene: SIN3B was changed from MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3733 | HTT |
Zornitza Stark edited their review of gene: HTT: Added comment: PMID 33432339: Jung et al 2021 - further characterisation of the family previously reported in PMID: 27329733 (Rodan et al 2016) - using WGS they confirm they are the most likely cause of the LOMARS phenotype and clarify their locations as NM_002111.8(HTT): c.8157T>A (p.Phe2719Leu) and NM_002111.8(HTT)c.4469+1G>A (Note there are incorrect Clinvar entries). Functional studies show them each to be a hypomorphic mutation, resulting in severe deficiency of huntingtin in compound heterozygotes. Still only 2 cases reported to date ((PMID: 27329733/33432339 and 26740508) with biallelic LOF variants in HTT associated with the LOMARS phenotype although this study add further weight with some functional data.; Changed publications: 26740508, 27329733, 33432339 |
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| Intellectual disability syndromic and non-syndromic v0.3730 | ANKRD17 | Paul De Fazio reviewed gene: ANKRD17: Rating: GREEN; Mode of pathogenicity: None; Publications: 33909992; Phenotypes: Intellectual disability, speech delay, and dysmorphism; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown; Current diagnostic: yes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3730 | SIN3B |
Elena Savva gene: SIN3B was added gene: SIN3B was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: SIN3B was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: SIN3B were set to PMID: 33811806 Phenotypes for gene: SIN3B were set to Syndromic intellectual disability/autism spectrum disorder Review for gene: SIN3B was set to GREEN Added comment: PMID: 33811806 - 9 affected patients, all de novo (2 PTCs, 2 missense, multigenic CNVs) - syndrome hallmarked by intellectual disability, developmental delay, and dysmorphic facial features with variably penetrant ASD, congenital malformations, corpus callosum defects, and impaired growth. - All SNV carriers had mild/mod ID Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3713 | AFF4 |
Zornitza Stark changed review comment from: Comment when marking as ready: At least 15 unrelated individuals reported.; to: Comment when marking as ready: At least 15 unrelated individuals reported. CdL-like, clinically recognisable phenotype, characterised by cognitive impairment, coarse facies, heart defects, obesity, pulmonary involvement, short stature, and skeletal dysplasia. |
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| Intellectual disability syndromic and non-syndromic v0.3707 | AFF4 | Teresa Zhao reviewed gene: AFF4: Rating: GREEN; Mode of pathogenicity: Other; Publications: 25730767; Phenotypes: CHOPS syndrome, MIM#616368; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3666 | GRIA3 | Zornitza Stark Mode of inheritance for gene: GRIA3 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3665 | GRIA3 | Michelle Torres reviewed gene: GRIA3: Rating: GREEN; Mode of pathogenicity: None; Publications: 32977175, 17989220; Phenotypes: Intellectual developmental disorder, X-linked, syndromic, Wu type (MIM#300699); Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3662 | UBE4A |
Chirag Patel gene: UBE4A was added gene: UBE4A was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: UBE4A was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: UBE4A were set to PMID: 33420346 Phenotypes for gene: UBE4A were set to Intellectual disability and global developmental delay Review for gene: UBE4A was set to GREEN Added comment: 8 individuals, from 4 unrelated families, with syndromic intellectual disability and global developmental delay (other clinical features included hypotonia, short stature, seizures, and behaviour disorder. Exome sequencing identified biallelic loss-of-function variants in UBE4A in the 4 families, with variants segregating with disease and parents carriers. They demonstrated that UBE4A loss-of-function variants reduced RNA expression and protein levels in clinical samples. Mice generated to mimic patient-specific Ube4a loss-of-function variant exhibited muscular and neurological/behavioural abnormalities, some of which are suggestive of the clinical abnormalities seen in the affected individuals. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3592 | TRMT10A | Zornitza Stark Phenotypes for gene: TRMT10A were changed from to Microcephaly, short stature, and impaired glucose metabolism 1, MIM# 616033; MONDO:0000208 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3589 | TRMT10A | Zornitza Stark reviewed gene: TRMT10A: Rating: GREEN; Mode of pathogenicity: None; Publications: 24204302, 25053765, 33448213, 33067246, 26535115, 26526202, 26297882; Phenotypes: Microcephaly, short stature, and impaired glucose metabolism 1, MIM# 616033, MONDO:0000208; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3582 | RTTN | Zornitza Stark Phenotypes for gene: RTTN were changed from to Microcephaly, short stature, and polymicrogyria with seizures, MIM# 614833; Microcephalic primordial dwarfism due to RTTN deficiency MONDO:0018764 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3579 | RTTN | Zornitza Stark reviewed gene: RTTN: Rating: GREEN; Mode of pathogenicity: None; Publications: 22939636, 26608784, 26940245, 30121372, 29967526, 30927481, 30121372; Phenotypes: Microcephaly, short stature, and polymicrogyria with seizures, MIM# 614833, Microcephalic primordial dwarfism due to RTTN deficiency MONDO:0018764; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3548 | ZNF711 | Zornitza Stark Mode of inheritance for gene: ZNF711 was changed from X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3545 | ZNF711 | Zornitza Stark Mode of inheritance for gene: ZNF711 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3544 | ZNF711 | Chirag Patel reviewed gene: ZNF711: Rating: GREEN; Mode of pathogenicity: None; Publications: PubMed: 27993705, 19377476; Phenotypes: Mental retardation, X-linked 97, OMIM #300803; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3543 | DM1 |
Bryony Thompson STR: DM1 was added STR: DM1 was added to Intellectual disability syndromic and non-syndromic. Sources: Expert list Mode of inheritance for STR: DM1 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for STR: DM1 were set to 20301344; 29325606 Phenotypes for STR: DM1 were set to Myotonic dystrophy 1 MIM#160900 Review for STR: DM1 was set to GREEN STR: DM1 was marked as clinically relevant Added comment: HGVS nomenclature: NM_001081560.2:c.*224_*226CTG[X] RNA toxic gain of function is mechanism of disease Premutation: 35-49 repeats, no clinical signs Mild: 50-~150 repeats, age of onset 20-70 yrs, clinical signs - cataracts, mild myotonia Classic: ~100-~1,000 repeats, age of onset 10-30 yrs, clinical signs - weakness, myotonia, cataracts, balding, cardiac arrhythmia Congenital: >1,000 repeats, age of onset birth-10 yrs , clinical signs - infantile hypotonia, respiratory deficits, intellectual disability, classic signs in adults Sources: Expert list |
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| Intellectual disability syndromic and non-syndromic v0.3528 | KDM5B | Zornitza Stark Mode of inheritance for gene: KDM5B was changed from Unknown to BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3527 | KDM5B | Zornitza Stark reviewed gene: KDM5B: Rating: GREEN; Mode of pathogenicity: None; Publications: 29276005, 30217758, 30409806; Phenotypes: Mental retardation, autosomal recessive 65 MIM#618109, autosomal dominant autism spectrum disorder or intellectual disability; Mode of inheritance: BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3504 | KDM5C | Zornitza Stark Mode of inheritance for gene: KDM5C was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3503 | KDM5C | Zornitza Stark reviewed gene: KDM5C: Rating: GREEN; Mode of pathogenicity: None; Publications: 15586325, 32279304; Phenotypes: Mental retardation, X-linked, syndromic, Claes-Jensen type, MIM# 300534, MONDO:0010355; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3484 | PGK1 | Zornitza Stark Mode of inheritance for gene: PGK1 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3483 | PGK1 | Zornitza Stark reviewed gene: PGK1: Rating: GREEN; Mode of pathogenicity: None; Publications: 6933565, 1547346, 7577653, 9512313; Phenotypes: Phosphoglycerate kinase 1 deficiency, MIM# 300653; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3472 | POLRMT |
Zornitza Stark gene: POLRMT was added gene: POLRMT was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: POLRMT was set to BOTH monoallelic and biallelic, autosomal or pseudoautosomal Publications for gene: POLRMT were set to 33602924 Phenotypes for gene: POLRMT were set to Mitochondrial disorder; intellectual disability; hypotonia Review for gene: POLRMT was set to GREEN Added comment: 8 individuals from 7 families reported. 5 families with bi-allelic variants and 2 with heterozygous variants. Affected individuals presented with global developmental delay, hypotonia, short stature, and speech/intellectual disability in childhood; one subject displayed an indolent progressive external ophthalmoplegia phenotype. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3466 | SPEN | Chern Lim reviewed gene: SPEN: Rating: GREEN; Mode of pathogenicity: None; Publications: 33596411; Phenotypes: Developmental delay/intellectual disability, autism spectrum disorder, anxiety, aggressive behavior, attention deficit disorder, hypotonia, brain and spine anomalies, congenital heart defects, high/narrow palate, facial dysmorphisms, and obesity/increased BMI; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown; Current diagnostic: yes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3457 | LMNB1 | Zornitza Stark Phenotypes for gene: LMNB1 were changed from Global developmental delay, Intellectual disability, Microcephaly, Short stature, Seizures, Abnormality of the corpus callosum, Cortical gyral simplification, Feeding difficulties, Scoliosis; Leukodystrophy, adult-onset, autosomal dominant, MIM#169500 to Microcephaly 26, primary, autosomal dominant, MIM# 619179; Global developmental delay, Intellectual disability, Microcephaly, Short stature, Seizures, Abnormality of the corpus callosum, Cortical gyral simplification, Feeding difficulties, Scoliosis; Leukodystrophy, adult-onset, autosomal dominant, MIM#169500 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3453 | MSL3 | Zornitza Stark Mode of inheritance for gene: MSL3 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3452 | MSL3 | Zornitza Stark reviewed gene: MSL3: Rating: GREEN; Mode of pathogenicity: None; Publications: 33173220; Phenotypes: Basilicata-Akhtar syndrome, OMIM # 301032; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3436 | OTUD5 | Zornitza Stark reviewed gene: OTUD5: Rating: GREEN; Mode of pathogenicity: None; Publications: 33523931; Phenotypes: Multiple congenital anomalies-neurodevelopmental syndrome, X-linked, MIM# 301056; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3427 | PIGF |
Paul De Fazio gene: PIGF was added gene: PIGF was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: PIGF was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: PIGF were set to 33386993 Phenotypes for gene: PIGF were set to Glycosylphosphatidylinositol deficiency, onychodystrophy, osteodystrophy, intellectual disability, and seizures Review for gene: PIGF was set to RED gene: PIGF was marked as current diagnostic Added comment: The same homozygous missense variant identified in 2 individuals from different families from the same region of India. Individuals had a phenotype similar to DOORS syndrome without deafness. Impaired glycosylphosphatidylinositol (GPI) biosynthesis was demonstrated. Rated Red as the two families are likely to be related (founder mutation?). Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3426 | HIRA |
Paul De Fazio gene: HIRA was added gene: HIRA was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: HIRA was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: HIRA were set to 33417013; 28135719; 25363760 Phenotypes for gene: HIRA were set to Neurodevelopmental disorder Review for gene: HIRA was set to GREEN gene: HIRA was marked as current diagnostic Added comment: Two unrelated patients with different de novo loss of function variants identified in PMID 33417013: Individual 1: intragenic deletion, phenotype included psychomotor retardation, ID, growth retardation, microcephaly, and facial features reminiscent of 22q deletion syndrome. Individual 2: canonical splice variant, phenotype mostly confined to ASD Another two de novo variants were identified in the literature by the authors of that paper, one stop-gain (DDD study, PMID 28135719) and one missense (large autism cohort, PMID 25363760). PMID 33417013 also showed that HIRA knockdown in mice results in neurodevelopmental abnormalities. Rated Green due to 4 unrelated individuals (albeit 2 in large cohort studies) and a mouse model. NB: HIRA is within the common 22q deletion region. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3420 | SATB1 | Elena Savva reviewed gene: SATB1: Rating: GREEN; Mode of pathogenicity: Other; Publications: PMID: 33513338, 33057194; Phenotypes: Neurodevelopmental disorders; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3420 | KCNN2 |
Ain Roesley gene: KCNN2 was added gene: KCNN2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: KCNN2 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: KCNN2 were set to 33242881 Phenotypes for gene: KCNN2 were set to neurodevelopmental movement disorders Penetrance for gene: KCNN2 were set to unknown Review for gene: KCNN2 was set to GREEN Added comment: - 11 probands all de novo except for 1 mother-daughter pair. - a mix of null and missense variants - 2/11 with microcephaly, 10/11 motor delay, 7/11 language delay (excluding 2 with regression), all with varying degrees of ID, 3/11 seizures, 7/11 movement disorder, 4/11 cerebellar ataxia, 6/11 MRI anomalies additional variants were noted in 2 patients: 1x cHet for variants in MED12L and 1x de novo TNK2 variant patch clamp functional studies were also done Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3420 | OTUD5 |
Chirag Patel gene: OTUD5 was added gene: OTUD5 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: OTUD5 was set to X-LINKED: hemizygous mutation in males, biallelic mutations in females Publications for gene: OTUD5 were set to PMID: 33131077 Phenotypes for gene: OTUD5 were set to X-linked severe neurodevelopmental delay, hydrocephalus, and early lethality Review for gene: OTUD5 was set to RED Added comment: 13 male patients from a single family with three generations affected. Patients presented prenatally or during the neonatal period with IUGR, ventriculomegaly, hydrocephalus, hypotonia, congenital heart defects, hypospadias, and severe neurodevelopmental delay. The disease is typically fatal during infancy, mainly due to sepsis (pneumonias). Female carriers are asymptomatic. WGS in four individuals identified a unique candidate variant in the OTUD5 gene (NM_017602.3:c.598G > A, p.Glu200Lys). The variant cosegregated with the disease in 10 tested individuals. No functional studies. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3378 | FGF13 |
Zornitza Stark gene: FGF13 was added gene: FGF13 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: FGF13 was set to X-LINKED: hemizygous mutation in males, biallelic mutations in females Publications for gene: FGF13 were set to 33245860 Phenotypes for gene: FGF13 were set to Intellectual disability; epilepsy Mode of pathogenicity for gene: FGF13 was set to Other Review for gene: FGF13 was set to GREEN Added comment: Two sibling pairs and three unrelated males reported who presented in infancy with intractable focal seizures and severe developmental delay. The variants were located in the N-terminal domain of the A isoform of FGF13/FHF2 (FHF2A). The X-linked FHF2 gene (also known as FGF13) has alternative first exons which produce multiple protein isoforms that differ in their N-terminal sequence. The variants were located at highly conserved residues in the FHF2A inactivation particle that competes with the intrinsic fast inactivation mechanism of Nav channels. Functional characterization of mutant FHF2A co-expressed with wild-type Nav1.6 (SCN8A) revealed that mutant FHF2A proteins lost the ability to induce rapid-onset, long-term blockade of the channel while retaining pro-excitatory properties. These gain-of-function effects are likely to increase neuronal excitability consistent with the epileptic potential of FHF2 variants. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3376 | UBR7 |
Zornitza Stark gene: UBR7 was added gene: UBR7 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: UBR7 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: UBR7 were set to 33340455 Phenotypes for gene: UBR7 were set to Intellectual disability; epilepsy; hypothyroidism; congenital anomalies; dysmorphic features Review for gene: UBR7 was set to GREEN Added comment: Seven individuals from 6 unrelated families. All had developmental delay, and all males had urogenital anomalies, namely cryptorchidism in 5/6 and small penis in 1/6. Six individuals had seizures and hypotonia. Hypothyroidism was present in 4/7 individuals, and ptosis was noted in 6/7 individuals. Five individuals exhibited cardiac abnormalities: two had ventricular septal defect, one had atrial septal defect, one had a patent ductus arteriosus requiring surgery, and the other had a patent ductus arteriosus and a patent foramen ovale that both closed spontaneously. Five individuals had short stature (height < 3rd percentile). Physical examination revealed various dysmorphic features, including prominent forehead (3/7), hypertelorism (4/7), telecanthus (1/7), epicanthus(1/7), downslanting palpebral fissures (3/7), thick eyebrow (1/7), low-set ears (3/7), long philtrum (2/7), unilateral single transverse palmar crease (1/7), and hypertrichosis (1/7). Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3368 | RALGAPB |
Elena Savva gene: RALGAPB was added gene: RALGAPB was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: RALGAPB was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: RALGAPB were set to PMID: 32853829 Phenotypes for gene: RALGAPB were set to Neurodevelopmental disorders, autism Review for gene: RALGAPB was set to RED Added comment: PMID: 32853829 - Reviews previous publications and identifies 10 de novo variants (5 PTCs, 5 missense) in patients with ASD (7/10), epilepsy (2/10) and developmental delay (1/10). Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3367 | EIF2AK2 | Seb Lunke reviewed gene: EIF2AK2: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: ; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3367 | FBRSL1 |
Elena Savva gene: FBRSL1 was added gene: FBRSL1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: FBRSL1 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: FBRSL1 were set to PMID: 32424618 Phenotypes for gene: FBRSL1 were set to Malformation and intellectual disability syndrome Review for gene: FBRSL1 was set to GREEN Added comment: Three children with de novo PTCs that escape NMD, and an overlapping syndromic phenotype with respiratory insufficiency, postnatal growth restriction, microcephaly, global developmental delay and other malformations. 2/3 had heart defects, cleft palate and hearing impairement. Supported by Xenopus oocyte functional studies Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3268 | FRAXE |
Bryony Thompson STR: FRAXE was added STR: FRAXE was added to Intellectual disability syndromic and non-syndromic. Sources: Expert list Mode of inheritance for STR: FRAXE was set to X-LINKED: hemizygous mutation in males, biallelic mutations in females Publications for STR: FRAXE were set to 8334699; 8673085; 11388762 Phenotypes for STR: FRAXE were set to Fragile X syndrome, FRAXE type (OMIM 309548) Review for STR: FRAXE was set to GREEN STR: FRAXE was marked as clinically relevant STR: FRAXE was marked as current diagnostic Added comment: NM_001169122.1(AFF2):c.-460_-458GCC(6_25) Loss of function through methylation silencing is the mechanism of disease Normal - 5-44 repeats Inconclusive - 45-54 repeats Premutation - 55-200 repeats Abnormal - >200 or >230 repeats Sources: Expert list |
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| Intellectual disability syndromic and non-syndromic v0.3248 | KDM4B |
Kristin Rigbye gene: KDM4B was added gene: KDM4B was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: KDM4B was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: KDM4B were set to PMID: 33232677 Phenotypes for gene: KDM4B were set to Global developmental delay, intellectual disability and neuroanatomical defects Review for gene: KDM4B was set to GREEN Added comment: Nine individuals with mono-allelic de novo or inherited variants in KDM4B. All individuals presented with dysmorphic features and global developmental delay (GDD) with language and motor skills most affected. Three individuals had a history of seizures, and four had anomalies on brain imaging ranging from agenesis of the corpus callosum with hydrocephalus to cystic formations, abnormal hippocampi, and polymicrogyria. In a knockout mouse the total brain volume was significantly reduced with decreased size of the hippocampal dentate gyrus, partial agenesis of the corpus callosum, and ventriculomegaly. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3245 | KAT5 | Zornitza Stark Phenotypes for gene: KAT5 were changed from Severe global developmental delay; Intellectual disability; Seizures; Microcephaly; Behavioral abnormality; Sleep disturbance; Morphological abnormality of the central nervous system; Short stature; Oral cleft; Abnormality of the face to Neurodevelopmental disorder with dysmorphic facies, sleep disturbance, and brain abnormalities (NEDFASB), MIM#619103; Severe global developmental delay; Intellectual disability; Seizures; Microcephaly; Behavioral abnormality; Sleep disturbance; Morphological abnormality of the central nervous system; Short stature; Oral cleft; Abnormality of the face | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3233 | TFE3 | Zornitza Stark Mode of inheritance for gene: TFE3 was changed from X-LINKED: hemizygous mutation in males, biallelic mutations in females to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3230 | TFE3 | Zornitza Stark Mode of inheritance for gene: TFE3 was changed from MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3227 | TFE3 | Arina Puzriakova reviewed gene: TFE3: Rating: GREEN; Mode of pathogenicity: Loss-of-function variants (as defined in pop up message) DO NOT cause this phenotype - please provide details in the comments; Publications: 32409512; Phenotypes: TFE3-related intellectual disability with pigmentary mosaicism; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3219 | OGT | Zornitza Stark Mode of inheritance for gene: OGT was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3218 | OGT | Zornitza Stark reviewed gene: OGT: Rating: GREEN; Mode of pathogenicity: None; Publications: 28302723, 28584052, 31296563, 31627256, 29769320, 29606577; Phenotypes: Mental retardation, X-linked 106, MIM# 300997; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3206 | USP9X | Zornitza Stark Mode of inheritance for gene: USP9X was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3199 | USP9X | Paul De Fazio reviewed gene: USP9X: Rating: GREEN; Mode of pathogenicity: None; Publications: 31443933, 26833328; Phenotypes: Mental retardation, X-linked 99, XLR (MIM#300919) and XLD (MIM#300968); Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males); Current diagnostic: yes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3194 | RLIM | Zornitza Stark Mode of inheritance for gene: RLIM was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3193 | RLIM | Zornitza Stark reviewed gene: RLIM: Rating: GREEN; Mode of pathogenicity: None; Publications: 29728705, 25735484, 25644381; Phenotypes: Tonne-Kalscheuer syndrome, MIM# 300978; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3189 | SLC12A2 | Zornitza Stark Phenotypes for gene: SLC12A2 were changed from Kilquist syndrome, MIM#619080; deafness; intellectual disability; dysmorphic features; absent salivation; ectodermal dysplasia; constipation; intestinal malrotation; multiple congenital anomalies to Delpire-McNeill syndrome, MIM# 619083; Kilquist syndrome, MIM#619080; deafness; intellectual disability; dysmorphic features; absent salivation; ectodermal dysplasia; constipation; intestinal malrotation; multiple congenital anomalies | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3188 | SLC12A2 | Zornitza Stark edited their review of gene: SLC12A2: Changed phenotypes: Delpire-McNeill syndrome, MIM# 619083, Kilquist syndrome, MIM#619080, deafness, intellectual disability, dysmorphic features, absent salivation, ectodermal dysplasia, constipation, intestinal malrotation, multiple congenital anomalies | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3188 | SLC12A2 | Zornitza Stark Phenotypes for gene: SLC12A2 were changed from Kilquist syndrome; deafness; intellectual disability; dysmorphic features; absent salivation; ectodermal dysplasia; constipation; intestinal malrotation; multiple congenital anomalies to Kilquist syndrome, MIM#619080; deafness; intellectual disability; dysmorphic features; absent salivation; ectodermal dysplasia; constipation; intestinal malrotation; multiple congenital anomalies | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3187 | SLC12A2 | Zornitza Stark edited their review of gene: SLC12A2: Changed phenotypes: Kilquist syndrome, MIM#619080, deafness, intellectual disability, dysmorphic features, absent salivation, ectodermal dysplasia, constipation, intestinal malrotation, multiple congenital anomalies | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3128 | PRKAR1B |
Konstantinos Varvagiannis gene: PRKAR1B was added gene: PRKAR1B was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: PRKAR1B was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: PRKAR1B were set to https://doi.org/10.1101/2020.09.10.20190314; 33057194 Phenotypes for gene: PRKAR1B were set to Global developmental delay; Intellectual disability; Autism; Attention deficit hyperactivity disorder; Aggressive behavior; Abnormality of movement; Upslanted palpebral fissure Penetrance for gene: PRKAR1B were set to unknown Review for gene: PRKAR1B was set to AMBER Added comment: Please consider inclusion of this gene with amber rating pending publication of the preprint and/or additional evidence. Marbach et al. (2020 - medRxiv : https://doi.org/10.1101/2020.09.10.20190314 - last author : C. Schaaf) report 6 unrelated individuals with heterozygous missense PRKAR1B variants. All presented formal ASD diagnosis (6/6), global developmental delay (6/6) and intellectual disability (all - formal evaluations were lacking though). Additional features included neurologic anomalies (movement disorders : dyspraxia, apraxia, clumsiness in all, with tremor/dystonia or involuntary movements as single occurrences). Three displayed high pain tolerance. Regression in speech was a feature in two. Additional behavior anomalies included ADHD (4-5/6) or aggression (3/6). There was no consistent pattern of malformations, physical anomalies or facial features (with the exception of uplsanted palpebral fissures reported in 4). 3 different missense variants were identified (NM_00116470:c.1003C>T - p.Arg335Trp, c.586G>A - p.Glu196Lys, c.500_501delAAinsTT - p.Gln167Leu) with Arg355Trp being a recurrent one within this cohort (4/6 subjects). A possible splicing effect may apply for the MNV. All variants are absent from gnomAD and the SNVs had CADD scores > 24. In all cases were parental samples were available (5/6), the variant had occurred as a de novo event. Protein kinase A (PKA) is a tetrameric holoenzyme formed by the association of 2 catalytic (C) subunits with a regulatory (R) subunit dimer. Activation of PKA is achieved through binding of 2 cAMP molecules to each R-subunit, and unleashing(/dissociation) of C-subunits to engage substrates. PRKACA/B genes encode the Cα- and Cβ-subunits while the 4 functionally non-redundant regulatory subunits are encoded by PRKAR1A/1B/2A/2B genes. As the authors comment, the RIβ subunit is primarily expressed in brain with higher expression in cortex and hypothalamus. The functional consequences of the variants at cellular level were not studied. Previous studies have demonstrated that downregulation of RIβ in murine hippocampal cultures, reduced phosphorylation of CREB, a transcription factor involved in long-term memory formation. The authors speculate that a similar effect on cAMP/PKA/CREB cascade may mediate the cognitive effects in humans. RIβ deficient mice also display diminished nociceptive pain, similar to the human phenotype. [Several refs provided]. The authors cite the study by Kaplanis et al (2020 - PMID: 33057194), where in a large sample of 31,058 trio exomes of children with developmental disorders, PRKAR1B was among the genes with significant enrichment for de novo missense variants. [The gene has a pLI score of 0.18 in gnomAD / o/e = 0.26 - so pLoF variants may not be deleterious]. Please note that a specific PRKAR1B variant (NM_002735.2:c.149T>G - p.Leu50Arg) has been previous reported to segregate with a late-onset neurodegenerative disorder characterized by dementia and/or parkinsonism within a large pedigree with 12 affected individuals [Wong et al 2014 - PMID: 25414040]. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3127 | MPP5 |
Konstantinos Varvagiannis gene: MPP5 was added gene: MPP5 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: MPP5 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: MPP5 were set to 33073849 Phenotypes for gene: MPP5 were set to Global developmental delay; Intellectual disability; Delayed speech and language development; Developmental regression; Behavioral abnormality Penetrance for gene: MPP5 were set to unknown Review for gene: MPP5 was set to GREEN Added comment: Sterling et al (2020 - PMID: 33073849) provide information on the phenotype of 3 individuals with de novo MPP5 variants. Common features included global developmental delay, intellectual disability (3/3 - severe in 2/3), speech delay/regression (the latter in at least 2) and behavioral abnormalities. Variable other features were reported, among others microcephaly (1/3), abnormal vision (1/3 : CVI, retinal dystrophy, nystagmus), brain MRI abnormalities (2/3), late-onset seizures (1/3). These subjects displayed variable and non-specific dysmorphic features. All were investigated by exome sequencing (previous investigations not mentioned). One subject was found to harbor a de novo mosaic (5/25 reads) stopgain variant, further confirmed by Sanger sequencing [NM_022474.4:c.1555C>T - p.(Arg519Ter). The specific variant is reported once in gnomAD (1/251338). Two de novo missense variants were identified in the remaining individuals [c.1289A>G - p.Glu430Gly / c.974A>C - p.His325Pro). All variants had in silico predictions in favor of a deleterious effect (CADD score >24). The authors comment that MPP5 encodes an apical complex protein with asymmetric localization to the apical side of polarized cells. It is expressed in brain, peripheral nervous system and other tissues. MPP5 is a member of the membrane-associated guanylate kinase family of proteins (MAGUK p55 subfamily), determining cell polarity at tight junctions. Previous animal models suggest that complete Mpp5(Pals1) KO in mice leads to near absence of cerebral cortical neurons. Htz KO display reduction in size of cerebral cortex and hippocampus. The gene is expressed in proliferating cell populations of cerebellum and important for establishment cerebellar architecture. Conditional KO of Mpp5(Pals1) in retinal progenitor cells mimics the retinal pathology observed in LCA. [Several refs. provided] The authors studied a heterozygous CNS-specific Mpp5 KO mouse model. These mice presented microcephaly, decreased cerebellar volume and cortical thickness, decreased ependymal cells and Mpp5 at the apical surface of cortical vertrical zone. The proportion of cortical cells undergoing apoptotic cell death was increased. Mice displayed behavioral abnormalities (hyperactivity) and visual deficits, with ERG traces further suggesting retinal blindness. Overall the mouse model was thought to recapitulate the behavioral abnormalities observed in affected subjects as well as individual rare features such as microcephaly and abnormal vision. Haploinsufficiency (rather than a dominant negative effect) is favored as the underlying disease mechanism. This is also in line with a dose dependent effect observed in mice. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3120 | COG8 |
Zornitza Stark changed review comment from: Four unrelated families reported with bi-allelic LOF variants and a broad range of predominantly neurological features (ID, seizures, arthrogryposis, brain malformations). ID present in 3/4, presentation in the 4th family was antenatal but with severe neurological phenotype that would have been expected to result in ID.; to: Four unrelated families reported with bi-allelic LOF variants and a broad range of predominantly neurological features (ID, seizures, arthrogryposis, brain malformations). ID reported in 3/4, presentation in the 4th family was antenatal but with severe neurological phenotype that would have been expected to result in ID. |
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| Intellectual disability syndromic and non-syndromic v0.3102 | PRKACB |
Konstantinos Varvagiannis gene: PRKACB was added gene: PRKACB was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: PRKACB was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: PRKACB were set to 33058759 Phenotypes for gene: PRKACB were set to Postaxial hand polydactyly; Postaxial foot polydactyly; Common atrium; Atrioventricular canal defect; Narrow chest; Abnormality of the teeth; Intellectual disability Penetrance for gene: PRKACB were set to Complete Review for gene: PRKACB was set to AMBER Added comment: ID was a feature in 2/4 individuals with PRKACB pathogenic variant reported to date. ------ Palencia-Campos et al (2020 - PMID: 33058759) report on the phenotype of 3 individuals heterozygous for PRKACA and 4 individuals heterozygous for PRKACB pathogenic variants. The most characteristic features in all individuals with PRKACA/PRKACB mutation, included postaxial polydactyly of hands (6/7 bilateral, 1/7 unilateral) and feet (4/7 bilateral, 1/7 unilateral), brachydactyly and congenital heart defects (CHD 5/7) namely a common atrium or AVSD. Two individuals with PRKACA variant who did not have CHD had offspring with the same variant and an AVSD. Other variably occurring features included short stature, limbs, narrow chest, abnormal teeth, oral frenula, nail dysplasia. One individual with PRKACB variant presented tumors. Intellectual disability was reported in 2/4 individuals with PRKACB variant (1/4: mild, 1/4: severe). The 3 individuals with PRKACA variant did not present ID. As the phenotype was overall suggestive of Ellis-van Creveld syndrome (or the allelic Weyers acrofacial dysostosis), although these diagnoses were ruled out following analysis of EVC and EVC2 genes. WES was carried out in all. PRKACA : A single heterozygous missense variant was identified in 3 individuals from 3 families (NM_002730.4:c.409G>A / p.Gly137Arg) with 1 of the probands harboring the variant in mosaic state (28% of reads) and having 2 similarly affected offspring. The variant was de novo in one individual and inherited in a third one having a similarly affected fetus (narrow thorax, postaxial polyd, AVSD). PRKACB : 4 different variants were identified (NM_002731.3: p.His88Arg/Asn, p.Gly235Arg, c.161C>T - p.Ser54Leu). One of the individuals was mosaic for the latter variant, while in all other cases the variant had occurred de novo. Protein kinase A (PKA) is a tetrameric holoenzyme formed by the association of 2 catalytic (C) subunits with a regulatory (R) subunit dimer. Activation of PKA is achieved through binding of 2 cAMP molecules to each R-subunit, and unleashing(/dissociation) of C-subunits to engage substrates. PRKACA/B genes encode the Cα- and Cβ-subunits while the 4 functionally non-redundant regulatory subunits are encoded by PRKAR1A/1B/2A/2B genes. The authors provide evidence that the variants confer increased sensitivity of PKA holoenzymes to activation by cAMP (compared to wt). By performing ectopic expression of wt or mt PRKACA/B (variants studied : PRKACA p.Gly137Arg / PRKACB p.Gly235Arg) in NIH 3T3 fibroblasts, the authors demonstrate that inhibition of hedgehog signaling likely underlyies the developmental defects observed in affected individuals. As for PRKACA, the authors cite another study where a 31-month old female with EvC syndrome diagnosis was found to harbor the aforementioned variant (NM_001304349.1:c.637G>A:p.Gly213Arg corresponding to NM_002730.4:c.409G>A / p.Gly137Arg) as a de novo event. Without additional evidence at the time, the variant was considered to be a candidate for this subject's phenotype (Monies et al 2019 – PMID: 31130284). Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3098 | DPH1 | Zornitza Stark edited their review of gene: DPH1: Added comment: Four unrelated families reported, 11 affected individuals. Common clinical features include abnormal skull shape (trigonocephaly, scaphocephaly, or prominent forehead accompanied with metopic ridge), distinctive face (downslanted palpebral fissures, low set ears, depressed nasal bridge, and sparse hair on the scalp, eyelashes, and/or eyebrows), short stature, developmental delay, and intellectual disability. Heart and brain malformations are also frequently observed.; Changed publications: 29362492, 29410513, 25558065, 26220823 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3078 | CSNK1G1 |
Konstantinos Varvagiannis gene: CSNK1G1 was added gene: CSNK1G1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: CSNK1G1 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: CSNK1G1 were set to 33009664 Phenotypes for gene: CSNK1G1 were set to Global developmental delay; Intellectual disability; Autism; Seizures; Abnormality of the face; Abnromality of limbs Penetrance for gene: CSNK1G1 were set to unknown Review for gene: CSNK1G1 was set to AMBER Added comment: Gold et al (2020 - PMID: 33009664) report 5 individuals with CSNK1G1 variants, including updated information on a previously reported subject (Martin et al 2014 - PMID: 24463883). Features included DD (5/5) with associated expressive language delay, ASD (in at least 3/5), seizures (2/5), dysmorphic facial features (4/5 arched eyebrows, 3/5 prominent central incisors, 2/5 epicanthus) and limb anomalies (2/5 - proximally placed thumb, 5th f. clinodactyly, asymmetric overgrowth - the other individual had tapering fingers). GI problems were observed in 4/5. Two individuals had macrocephaly and one had microcephaly. There was no formal developmental assessment although ID might be implied in at least 3 individuals (p1: 20y - single words/regression in walking following a seizure episode, p2: 8y - first words at 5y, assistance to feed, dress and bathe, ASD, p4: 13y - regression, assistance to feed and dress). CSNK1G1 encodes the gamma-1 isoform of casein kinase 1, a protein involved in growth and cell morphogenesis. The gene has ubiquitous expression, incl. brain. As commented, in brain it regulates phosphorylation of NMDA receptors, playing a role in synaptic transmission (4 articles cited). One individual had a 1.2 kb deletion spanning exon 3 of CSNK1G1 [chr15:64550952-64552120 - GRCh37]. Parental samples were unavailable for this individual. Four individuals were found to harbor de novo CSNK1G1 variants [NM_022048.3: c.688C>T - p.(Arg230Trp) dn | c.1255C>T - p.(Gln419*) dn | c.1214+5G>A dn with in silico predictions in favor of splice disruption | c.419C>T - p.(Thr140Met) dn]. Arg230Trp is however present once in gnomAD. The stopgain variant is located in the last exon and predicted to skip NMD. There were no variant studies performed. The Drosophila gish gene encodes a CK1γ homolog with preferential expression in the mushroom body. Heterozygous and homozygous mutants exhibit impairment in memory retention, more severe in homozygous flies. gish was also identified as a seizure modifier in a fly epilepsy model (heterozygous para mt flies). The authors also speculate that impaired transduction of LRP6 (and WNT signaling) might be implicated. Finally the authors discuss the phenotype of individuals in Decipher one of whom (327861) harbors a frameshift variant and presenting ID, epilepsy and progressive spasticity. [NB. Inheritance of this variant is not specified, while this individual has a further inherited SCN2A missense SNV]. Two further Decipher cases with microdeletions spanning CSNK1G1 (and additional variants) also discussed. Overall, this gene can be considered for inclusion with probably amber rating. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3078 | LMNB2 |
Konstantinos Varvagiannis gene: LMNB2 was added gene: LMNB2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: LMNB2 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: LMNB2 were set to 33033404 Phenotypes for gene: LMNB2 were set to Congenital microcephaly; Global developmental delay; Intellectual disability Penetrance for gene: LMNB2 were set to Complete Mode of pathogenicity for gene: LMNB2 was set to Loss-of-function variants (as defined in pop up message) DO NOT cause this phenotype - please provide details in the comments Review for gene: LMNB2 was set to GREEN Added comment: Please consider inclusion of LMNB2 in the ID panel with amber/green rating. Parry et al (2020 - PMID: 33033404) in a study to identify novel microcephaly genes using the DDD and 100k genomes project (100kGP) patient cohort, report on the phenotype of 13 individuals with heterozygous variant in LMNB1 (N=7) and LMNB2 (N=6). LMNB1 : The authors identified 3 recurrent variants (c.97A>G - p.Lys33Glu (3), c.97_99del - p.Lys33del (2) , c.269G>C - p.Arg90Pro (2) / NM_005573.4) in seven individuals (3 from the DDD study, 4 from the 100kGP). In all cases were segregation studies were possible, the variant had occurred as a de novo event. LMNB2 : 4 individuals from the DDD cohort and 1 from the 100kGP were found to harbor the same missense SNV (NM_032737.4:c.1192G>A, p.Glu398Lys). The variant had occurred de novo in 3 subjects and was inherited from a mosaic - unaffected - parent in a further case. Another individual was found to harbor c.160A>C - p.Asn54His. LMNB1/2 common phenotypes : All cases had congenital microcephaly (OFC -5.85 +/- 1.14 SD) appart from one individual, without history of IUGR or postnatally abnormal height (the latter in most). Neuroimaging suggested structurally normal brain without abnormal migration. Gyral simplification / global reduction in white matter / increased extra axial spaces / enlarged ventricles were reported in 2. LMNB1 - Global developmental delay was a feature in all (mild to severe) with some having occasional words at 7y (P3), absent speech (P9 - age category 5-10y) or ID not further specified (P13). LMNB2 - DD was a feature in all 6 subjects (5/6 moderate to severe - 1/6 GDD). 5/6 were 10y or older with language (in 3 language not achieved) and motor deficits (walking not achieved in 1/6 - occured at the age of 6y in 1/6). Facial features were not consistent nor suggestive of a syndromic diagnosis (sloping forehead in some). Overall, as the authors comment, the phenotype corresponded to a severe nonsyndromic microcephaly (although additional features were reported in some). Animal model: Microcephaly is supported by Lmnb1 ko mouse model. Lmnb1/2 ko mice however display migration defects, while Lmnb2 ko mice do not have reduced size at birth. Heterozygous Lmnb1 mice do not present microcephaly. It is suggested that while animal models support a similar (to the human) phenotype the underlying mechanism is different. Variant effect : variants were shown to affect highly conserved residues within the lamin a-helical rod-domain. As affected residues are conserved in LMNA, modelling with available LMNA PDB structures, suggested disrupted interactions required for higher-order assembly of lamin filaments. Recurrence of specific variants at specific residues, absence of pLoF ones, the htz mouse Lmnb1 phenotype (absence of microcephaly) and the proposed mechanism (perturbation of complex formation) suggest a gain-of-function/dominant-negative effect rather than happloinsufficiency. [Please also note the additional OMIM phenotypes for LMNB1 / LMNB2 - not here reviewed] Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3053 | NEMF |
Konstantinos Varvagiannis changed review comment from: Biallelic (and possibly monoallelic) pathogenic variants in this gene are associated with DD/ID. Martin et al (2020 - PMID:32934225) report on 8 individuals from 6 families with a juvenile neuromuscular disease due to biallelic NEMF variants. (In one of these 8 cases it could not be ruled out that a de novo and maternally inherited variant were on the same allele, as phase was not determined). A ninth individual with similar presentation was found to harbor a single NEMF missense SNV as de novo event (due to a speculated dominant-negative effect). This individual had a similar presentation. Features incl. hypotonia (4/8 with biallelic variant (B) | 1/1 monoallelic (M) ), DD/ID (7/8B | 0/1M) with speech delay as universal feature (8/8B | 1/1M), axonal neuropathy (3/3B | 1/1M), ataxia (3/8B | 0/1M). Other findings included tremor (1/7B | 1/1M), abnormal brain imaging (2/6B / ?/1M), kyphosis/scoliosis (4/8B | 0/1M), respiratory distress (1/8B | 0/1M). NEMF (Rqc2 in yeast) encodes the nuclear export mediator factor, a component of the Ribosome-associated Quality Control (RCQ) complex which is involved in proteolytic targeting of incomplete polypeptides prodduced by ribosome stalling. NEMF facilitates the recruitment of E3 ligase Listerin (LTN1) which ubiquitinates nascent polypeptide chains for subsequent proteasomal degradation. The author provide evidence that mice homozygous for Nemf missense mutations display progressive motor phenotypes, exhibit neurogenic atrophy and progressive axonal degeneration. A further NEMF-null mouse model displayed more severe phenotype (with heterozygous mice being unaffected). Equivalent mutations (of those in the above mouse model) in yeast (Rqc2) were shown to interfere with its ability to modify aberrant translation products with C-terminal tails which assist RQC-mediated protein degradation. Mutation of Ltn1 (belonging to the same protein control pathway) has been also shown to lead to neurodegeneration im mice. Overall NEMF is thought to play a role in neuronal translational homeostasis and the disorder to be mediated by dysfunction of the RQC pathway (normally protecting neurons against degeneration).; to: Biallelic (and possibly monoallelic) pathogenic variants in this gene are associated with DD/ID. Martin et al (2020 - PMID:32934225) report on 8 individuals from 6 families with a juvenile neuromuscular disease due to biallelic NEMF variants. (In one of these 8 cases it could not be ruled out that a de novo and maternally inherited variant were on the same allele, as phase was not determined). A ninth individual with similar presentation was found to harbor a single NEMF missense SNV as de novo event (due to a speculated dominant-negative effect). This individual had a similar presentation. Features incl. hypotonia (4/8 with biallelic variant (B) | 1/1 monoallelic (M) ), DD/ID (7/8B | 0/1M) with speech delay as universal feature (8/8B | 1/1M), axonal neuropathy (3/3B | 1/1M), ataxia (3/8B | 0/1M). Other findings included tremor (1/7B | 1/1M), abnormal brain imaging (2/6B / ?/1M), kyphosis/scoliosis (4/8B | 0/1M), respiratory distress (1/8B | 0/1M). NEMF (Rqc2 in yeast) encodes the nuclear export mediator factor, a component of the Ribosome-associated Quality Control (RCQ) complex which is involved in proteolytic targeting of incomplete polypeptides produced by ribosome stalling. NEMF facilitates the recruitment of E3 ligase Listerin (LTN1) which ubiquitinates nascent polypeptide chains for subsequent proteasomal degradation. The author provide evidence that mice homozygous for Nemf missense mutations display progressive motor phenotypes, exhibit neurogenic atrophy and progressive axonal degeneration. A further NEMF-null mouse model displayed more severe phenotype (with heterozygous mice being unaffected). Equivalent mutations (of those in the above mouse model) in yeast (Rqc2) were shown to interfere with its ability to modify aberrant translation products with C-terminal tails which assist RQC-mediated protein degradation. Mutation of Ltn1 (belonging to the same protein control pathway) has been also shown to lead to neurodegeneration in mice. Overall NEMF is thought to play a role in neuronal translational homeostasis and the disorder to be mediated by dysfunction of the RQC pathway (normally protecting neurons against degeneration). |
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| Intellectual disability syndromic and non-syndromic v0.3053 | NEMF |
Konstantinos Varvagiannis changed review comment from: Biallelic (and possibly monoallelic) pathogenic variants in this gene are associated with DD/ID. Martin et al (2020 - PMID:32934225) report on 8 individuals from 6 families with a juvenile neuromuscular disease due to biallelic NEMF variants. (In one of these 8 cases it could not be ruled out that a de novo and maternally inherited variants were on the same allele, as phase was not been determined). A ninth individual with similar presentation was found to harbor a single NEMF missense SNV as de novo event (due to a speculated dominant-negative effect). This individual had a similar presentation. Features incl. hypotonia (4/8 with biallelic variant (B) | 1/1 monoallelic (M) ), DD/ID (7/8B | 0/1M) with speech delay as universal feature (8/8B | 1/1M), axonal neuropathy (3/3B | 1/1M), ataxia (3/8B | 0/1M). Other findings included tremor (1/7B | 1/1M), abnormal brain imaging (2/6B / ?/1M), kyphosis/scoliosis (4/8B | 0/1M), respiratory distress (1/8B | 0/1M). NEMF (Rqc2 in yeast) encodes the nuclear export mediator factor, a component of the Ribosome-associated Quality Control (RCQ) complex which is involved in proteolytic targeting of incomplete polypeptides prodduced by ribosome stalling. NEMF facilitates the recruitment of E3 ligase Listerin (LTN1) which ubiquitinates nascent polypeptide chains for subsequent proteasomal degradation. The author provide evidence that mice homozygous for Nemf missense mutations display progressive motor phenotypes, exhibit neurogenic atrophy and progressive axonal degeneration. A further NEMF-null mouse model displayed more severe phenotype (with heterozygous mice being unaffected). Equivalent mutations (of those in the above mouse model) in yeast (Rqc2) were shown to interfere with its ability to modify aberrant translation products with C-terminal tails which assist RQC-mediated protein degradation. Mutation of Ltn1 (belonging to the same protein control pathway) has been also shown to lead to neurodegeneration im mice. Overall NEMF is thought to play a role in neuronal translational homeostasis and the disorder to be mediated by dysfunction of the RQC pathway (normally protecting neurons against degeneration).; to: Biallelic (and possibly monoallelic) pathogenic variants in this gene are associated with DD/ID. Martin et al (2020 - PMID:32934225) report on 8 individuals from 6 families with a juvenile neuromuscular disease due to biallelic NEMF variants. (In one of these 8 cases it could not be ruled out that a de novo and maternally inherited variant were on the same allele, as phase was not determined). A ninth individual with similar presentation was found to harbor a single NEMF missense SNV as de novo event (due to a speculated dominant-negative effect). This individual had a similar presentation. Features incl. hypotonia (4/8 with biallelic variant (B) | 1/1 monoallelic (M) ), DD/ID (7/8B | 0/1M) with speech delay as universal feature (8/8B | 1/1M), axonal neuropathy (3/3B | 1/1M), ataxia (3/8B | 0/1M). Other findings included tremor (1/7B | 1/1M), abnormal brain imaging (2/6B / ?/1M), kyphosis/scoliosis (4/8B | 0/1M), respiratory distress (1/8B | 0/1M). NEMF (Rqc2 in yeast) encodes the nuclear export mediator factor, a component of the Ribosome-associated Quality Control (RCQ) complex which is involved in proteolytic targeting of incomplete polypeptides prodduced by ribosome stalling. NEMF facilitates the recruitment of E3 ligase Listerin (LTN1) which ubiquitinates nascent polypeptide chains for subsequent proteasomal degradation. The author provide evidence that mice homozygous for Nemf missense mutations display progressive motor phenotypes, exhibit neurogenic atrophy and progressive axonal degeneration. A further NEMF-null mouse model displayed more severe phenotype (with heterozygous mice being unaffected). Equivalent mutations (of those in the above mouse model) in yeast (Rqc2) were shown to interfere with its ability to modify aberrant translation products with C-terminal tails which assist RQC-mediated protein degradation. Mutation of Ltn1 (belonging to the same protein control pathway) has been also shown to lead to neurodegeneration im mice. Overall NEMF is thought to play a role in neuronal translational homeostasis and the disorder to be mediated by dysfunction of the RQC pathway (normally protecting neurons against degeneration). |
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| Intellectual disability syndromic and non-syndromic v0.3053 | NEMF |
Konstantinos Varvagiannis changed review comment from: Biallelic (and possibly monoallelic) pathogenic variants in this gene are associated with DD/ID. Martin et al (2020 - PMID:32934225) report on 8 individuals from 6 families with a juvenile neuromuscular disease due to biallelic NEMF variants. (In one of these 8 cases it could be ruled out that the de novo and maternally inherited variants were on the same allele, as phase was not been determined). A ninth individual with similar presentation was found to harbor a single NEMF missense SNV as de novo event (due to a speculated dominant-negative effect). This individual had a similar presentation. Features incl. hypotonia (4/8 with biallelic variant (B) | 1/1 monoallelic (M) ), DD/ID (7/8B | 0/1M) with speech delay as universal feature (8/8B | 1/1M), axonal neuropathy (3/3B | 1/1M), ataxia (3/8B | 0/1M). Other findings included tremor (1/7B | 1/1M), abnormal brain imaging (2/6B / ?/1M), kyphosis/scoliosis (4/8B | 0/1M), respiratory distress (1/8B | 0/1M). NEMF (Rqc2 in yeast) encodes the nuclear export mediator factor, a component of the Ribosome-associated Quality Control (RCQ) complex which is involved in proteolytic targeting of incomplete polypeptides prodduced by ribosome stalling. NEMF facilitates the recruitment of E3 ligase Listerin (LTN1) which ubiquitinates nascent polypeptide chains for subsequent proteasomal degradation. The author provide evidence that mice homozygous for Nemf missense mutations display progressive motor phenotypes, exhibit neurogenic atrophy and progressive axonal degeneration. A further NEMF-null mouse model displayed more severe phenotype (with heterozygous mice being unaffected). Equivalent mutations (of those in the above mouse model) in yeast (Rqc2) were shown to interfere with its ability to modify aberrant translation products with C-terminal tails which assist RQC-mediated protein degradation. Mutation of Ltn1 (belonging to the same protein control pathway) has been also shown to lead to neurodegeneration im mice. Overall NEMF is thought to play a role in neuronal translational homeostasis and the disorder to be mediated by dysfunction of the RQC pathway (normally protecting neurons against degeneration).; to: Biallelic (and possibly monoallelic) pathogenic variants in this gene are associated with DD/ID. Martin et al (2020 - PMID:32934225) report on 8 individuals from 6 families with a juvenile neuromuscular disease due to biallelic NEMF variants. (In one of these 8 cases it could not be ruled out that a de novo and maternally inherited variants were on the same allele, as phase was not been determined). A ninth individual with similar presentation was found to harbor a single NEMF missense SNV as de novo event (due to a speculated dominant-negative effect). This individual had a similar presentation. Features incl. hypotonia (4/8 with biallelic variant (B) | 1/1 monoallelic (M) ), DD/ID (7/8B | 0/1M) with speech delay as universal feature (8/8B | 1/1M), axonal neuropathy (3/3B | 1/1M), ataxia (3/8B | 0/1M). Other findings included tremor (1/7B | 1/1M), abnormal brain imaging (2/6B / ?/1M), kyphosis/scoliosis (4/8B | 0/1M), respiratory distress (1/8B | 0/1M). NEMF (Rqc2 in yeast) encodes the nuclear export mediator factor, a component of the Ribosome-associated Quality Control (RCQ) complex which is involved in proteolytic targeting of incomplete polypeptides prodduced by ribosome stalling. NEMF facilitates the recruitment of E3 ligase Listerin (LTN1) which ubiquitinates nascent polypeptide chains for subsequent proteasomal degradation. The author provide evidence that mice homozygous for Nemf missense mutations display progressive motor phenotypes, exhibit neurogenic atrophy and progressive axonal degeneration. A further NEMF-null mouse model displayed more severe phenotype (with heterozygous mice being unaffected). Equivalent mutations (of those in the above mouse model) in yeast (Rqc2) were shown to interfere with its ability to modify aberrant translation products with C-terminal tails which assist RQC-mediated protein degradation. Mutation of Ltn1 (belonging to the same protein control pathway) has been also shown to lead to neurodegeneration im mice. Overall NEMF is thought to play a role in neuronal translational homeostasis and the disorder to be mediated by dysfunction of the RQC pathway (normally protecting neurons against degeneration). |
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| Intellectual disability syndromic and non-syndromic v0.3050 | HPDL |
Zornitza Stark changed review comment from: Intellectual impairment is variable, ranging from poor visual contact with inability to walk or speak to milder intellectual disability with the ability to say some words.; to: 17 individuals from 13 families, with a spectrum of neurologic impairment ranging from a severe congenital form without any neurological development (n = 2/17, 12%) to infantile-onset presentations (n = 10/17, 59%) with moderate to severe neurodevelopmental issues, partly with a pathology reminiscent of mitochondrial disease (Leigh-like syndrome), to juvenile-onset spastic paraplegia (n = 5/17, 29%). Intellectual impairment is variable, ranging from poor visual contact with inability to walk or speak to milder intellectual disability with the ability to say some words. Frequently observed additional clinical findings included chronic progression of neurological signs (n = 16/17, 94%), microcephaly (n = 9/16, 56%), and seizures/epilepsy (n = 9/17, 53%). Other relevant clinical findings were visual disturbances/strabismus (n = 9/17, 53%) and loss of developmental milestones (n = 6/17, 35%). Acute central respiratory failure leading to life-threatening events requiring partly mechanically assisted ventilation occurred in half of individuals with infantile presentation (n = 5/10, 50%), respectively one third of all individuals (n = 5/17, 29%). Demyelinating neuropathy was present in three individuals (n = 3/11, 27%), with reduced sensory nerve conduction velocity (NCV) in all and severely reduced motor NCV in one. |
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| Intellectual disability syndromic and non-syndromic v0.3047 | PRKD1 | Arina Puzriakova reviewed gene: PRKD1: Rating: AMBER; Mode of pathogenicity: None; Publications: 27479907, 32817298; Phenotypes: Congenital heart defects and ectodermal dysplasia, 617364; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3033 | ALG13 | Zornitza Stark Mode of inheritance for gene: ALG13 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3032 | ALG13 | Zornitza Stark reviewed gene: ALG13: Rating: GREEN; Mode of pathogenicity: None; Publications: 23033978, 23934111, 24781210, 24896178, 25732998, 26138355, 26482601, 28940310, 32238909; Phenotypes: Congenital disorder of glycosylation, type Is (MIM# 300884); Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3026 | SECISBP2 |
Anna Le Fevre gene: SECISBP2 was added gene: SECISBP2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: SECISBP2 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: SECISBP2 were set to 16228000; 19602558; 21084748; 22247018 Phenotypes for gene: SECISBP2 were set to #609698 THYROID HORMONE METABOLISM, ABNORMAL Penetrance for gene: SECISBP2 were set to unknown Review for gene: SECISBP2 was set to RED Added comment: Multiple families with biallelic loss of function variants have been reported with a disorder of thyroid hormone metabolism involving synthesis of selenoproteins. Features include short stature with delayed bone age, muscle weakness with fatty infiltration of skeletal muscle, azoospermia, and mild developmental delay. Photosensitivity and high frequency SNHL have been reported. Thyroid function tests show elevated FT4 and rT3, low FT3 and normal or mildly elevated TSH. Incomplete loss of SECISBP2 function has been hypothesized to cause a milder phenotype. At least two reports of children with delayed milestones. One report of an affected adult with mild ID. Further reports may clarify if this phenotype typically includes ID. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3026 | LAS1L | Zornitza Stark Mode of inheritance for gene: LAS1L was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3025 | LAS1L | Zornitza Stark edited their review of gene: LAS1L: Changed rating: GREEN; Changed mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3023 | UPF3B | Zornitza Stark Mode of inheritance for gene: UPF3B was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3022 | UPF3B | Zornitza Stark reviewed gene: UPF3B: Rating: GREEN; Mode of pathogenicity: None; Publications: 19377476, 17704778, 31737052, 28948974; Phenotypes: Mental retardation, X-linked, syndromic 14, MIM# 300676; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3022 | UPF3B | Arina Puzriakova reviewed gene: UPF3B: Rating: GREEN; Mode of pathogenicity: None; Publications: 32667670; Phenotypes: Mental retardation, X-linked, syndromic 14, 300676; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3013 | ZMYM2 |
Konstantinos Varvagiannis gene: ZMYM2 was added gene: ZMYM2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: ZMYM2 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: ZMYM2 were set to 32891193 Phenotypes for gene: ZMYM2 were set to Abnormality of the urinary system; Global developmental delay; Intellectual disability; Microcephaly; Abnormality of the cardiovascular system; Autism; Seizures; Abnormality of the head or neck; Abnormality of the nail; Small hand; Short foot; Clinodactyly Penetrance for gene: ZMYM2 were set to unknown Review for gene: ZMYM2 was set to AMBER Added comment: Heterozygous pathogenic (pLoF) ZMYM2 variants have been reported in individuals with syndromic presentation including CAKUT (in several cases) and variable neurological manifestations among extra-renal features. DD and ID were reported in some of the families described to date as summarized below. You might consider inclusion with green/amber rating in the ID panel and green in the panel for CAKUT. -- Connaughton et al (2020 - PMID: 32891193) report on 19 individuals (from 15 unrelated families) with heterozygous pathogenic ZMYM2 variants. [Article not reviewed in detail]. Affected individuals from 7 families presented with CAKUT while all of them displayed extra-renal features. Neurological manifestations were reported in 16 individuals from 14 families (data not available for 1 fam), among others hypotonia (3/14 fam), speech delay (4/14 fam), global DD (9/14 fam), ID (4/14 fam), microcephaly (4/14 fam). ASD was reported in 4 fam (4 indiv). Seizures were reported in 2 fam (2 indiv). Variable other features included cardiac defects, facial dysmorphisms, small hands and feet with dys-/hypo-plastic nails and clinodactyly. 14 pLoF variants were identified, in most cases as de novo events (8 fam). In 2 families the variant was inherited from an affected parent. Germline mosaicism occurred in 1 family. The human disease features were recapitulated in a X. tropicalis morpholino knockdown, with expression of truncating variants failing to rescue renal and craniofacial defects. Heterozygous Zmym2-deficient mice also recapitulated the features of CAKUT. ZMYM2 (previously ZNF198) encodes a nuclear zinc finger protein localizing to the nucleus (and PML nuclear body). It has previously been identified as transcriptional corepressor interacting with nuclear receptors and the LSD1-CoREST-HDAC1 complex. It has also been shown to interact with FOXP transcription factors. The authors provide evidence for loss of interaction of the truncated ZMYM2 with FOXP1 (mutations in the latter having recently been reported in syndromic CAKUT). Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.3011 | LMNB1 | Zornitza Stark Phenotypes for gene: LMNB1 were changed from Leukodystrophy, adult-onset, autosomal dominant, MIM#169500 to Global developmental delay, Intellectual disability, Microcephaly, Short stature, Seizures, Abnormality of the corpus callosum, Cortical gyral simplification, Feeding difficulties, Scoliosis; Leukodystrophy, adult-onset, autosomal dominant, MIM#169500 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3007 | LMNB1 | Konstantinos Varvagiannis reviewed gene: LMNB1: Rating: GREEN; Mode of pathogenicity: Loss-of-function variants (as defined in pop up message) DO NOT cause this phenotype - please provide details in the comments; Publications: 32910914; Phenotypes: Global developmental delay, Intellectual disability, Microcephaly, Short stature, Seizures, Abnormality of the corpus callosum, Cortical gyral simplification, Feeding difficulties, Scoliosis; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2980 | SLC16A2 | Zornitza Stark Mode of inheritance for gene: SLC16A2 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2979 | SLC16A2 | Zornitza Stark reviewed gene: SLC16A2: Rating: GREEN; Mode of pathogenicity: None; Publications: 15980113, 31410843, 20301789; Phenotypes: Allan-Herndon-Dudley syndrome, MIM# 300523; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2976 | HECW2 | Teresa Zhao reviewed gene: HECW2: Rating: GREEN; Mode of pathogenicity: None; Publications: 27389779; Phenotypes: Neurodevelopmental disorder with hypotonia, seizures, and absent language (MIM#617268); Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2968 | ATP1A3 | Seb Lunke reviewed gene: ATP1A3: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: ; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2967 | ARID1A | Crystle Lee reviewed gene: ARID1A: Rating: GREEN; Mode of pathogenicity: None; Publications: 23929686, 22426308, 25168959; Phenotypes: Coffin-Siris syndrome 2 (MIM#614607); Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2956 | EIF2S3 | Zornitza Stark Mode of inheritance for gene: EIF2S3 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2955 | EIF2S3 | Zornitza Stark reviewed gene: EIF2S3: Rating: GREEN; Mode of pathogenicity: None; Publications: 23063529, 27333055, 28055140, 32799315; Phenotypes: MEHMO syndrome, MIM# 300148; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2949 | DHX37 |
Naomi Baker gene: DHX37 was added gene: DHX37 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: DHX37 was set to BOTH monoallelic and biallelic, autosomal or pseudoautosomal Publications for gene: DHX37 were set to PMID: 26539891; 31256877 Phenotypes for gene: DHX37 were set to Neurodevelopmental disorder with brain anomalies and with or without vertebral or cardiac anomalies, MIM#618731 Review for gene: DHX37 was set to GREEN Added comment: Two unrelated patients from consanguineous families reported with biallelic missense variants. Clinical presentation included severe microcephaly, DD/ID, and cortical atrophy (PMID: 26539891). Five individuals who share a phenotype of DD and/or ID and CNS dysfunction. Three out of five individuals also have scoliosis, and two have cardiac phenotypes (PMID: 31256877). Three of the patients had bialleleic missense variants, while two patients had a de novo monoallelic missense variant. Note that OMIM lists inheritance as biallelic, however two monoallelic cases reportes. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2947 | PAK3 | Zornitza Stark Mode of inheritance for gene: PAK3 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2946 | PAK3 | Zornitza Stark reviewed gene: PAK3: Rating: GREEN; Mode of pathogenicity: None; Publications: 9731525, 10946356, 12884430, 17853471, 18523455, 32050918, 32005903, 31943058, 31843706, 31678216; Phenotypes: Mental retardation, X-linked 30/47, MIM# 300558, Intellectual disability; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2939 | TRAPPC2L |
Zornitza Stark gene: TRAPPC2L was added gene: TRAPPC2L was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: TRAPPC2L was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: TRAPPC2L were set to 30120216; 32843486 Phenotypes for gene: TRAPPC2L were set to Encephalopathy, progressive, early-onset, with episodic rhabdomyolysis, 618331 Review for gene: TRAPPC2L was set to AMBER Added comment: Total of three families, but two share a founder variant, and there are some disparities between the clinical presentations reported in the two publications. Rating Amber as additional cases required to delineate the genotype-phenotype relationship. PMID: 30120216 (2018) - Two unrelated probands with an identical homozygous missense (c.109G>T, p.Asp37Tyr) variant in TRAPPC2L. Both individuals presented neurodevelopmental delay, febrile illness-induced encephalopathy, and episodic rhabdomyolysis, followed by developmental arrest, seizures and tetraplegia. The variant segregated with the phenotype in each family, and haplotype analysis suggested a founder effect. The mutant protein was expressed in patient fibroblasts, but displayed membrane trafficking delays. Studies in yeast showed that the variant impaired interaction with TRAPPC10, and increased levels of the active RAB11. PMID: 32843486 (2020) - In an Ashkenazi Jewish family with three affected sibs with GDD/ID, WGS revealed a segregating homozygous missense variant (c.5G>C, p.Ala2Gly) in the TRAPPC2L gene. No seizures, brain MRI abnormalities, or illness provoked regression were documented in this family. Comparable to the previous study, the variant resulted in delayed ER-to-Golgi trafficking and elevated levels of active RAB11. Studies using yeast and in vitro binding, showed that the variant disrupted interaction with another core TRAPP protein, TRAPPC6a. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2934 | DPP6 | Ain Roesley edited their review of gene: DPP6: Changed mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2920 | CTNND1 |
Zornitza Stark gene: CTNND1 was added gene: CTNND1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: CTNND1 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: CTNND1 were set to 28301459; 32196547 Phenotypes for gene: CTNND1 were set to Blepharocheilodontic syndrome 2, MIM# 617681 Review for gene: CTNND1 was set to AMBER Added comment: 4 individuals from 3 unrelated families with blepharocheilodontic syndrome and mutations in the CTNND1 gene reported originally in PMID 28301459. All had eyelid anomalies, including ectropion of the lower lids, euryblepharon, lagophthalmia, and distichiasis. In addition, all 4 showed typical facial dysmorphism with hypertelorism, flat face, and high forehead, and all had conical teeth and tooth agenesis. Three had cleft lip and palate, 3 had hair anomalies, and 1 had hypothyroidism due to hypoplasia or aplasia of the thyroid gland. None of the patients exhibited anal atresia or neural tube defects. PMID: 32196547 - Alharatani et al 2020 - report an expanded phenotype for CTNND1 patients. They report 13 individuals from nine families with novel protein-truncating variants in CTNND1 identified by WES. The mutations were not previously described in blepharocheilodontic (BCD), orofacial cleft cases nor in gnomAD. 8 patients had de novo variants, 2 inherited from affected parents, 2 participants inherited a variant from a parent with a mild phenotype. 8/13 patients showed cleft palate. Additional phenotypic features seen include mild limb phenotypes (9/13), cardiovascular anomalies (6/13) and Developmental delay and other neurodevelopmental problems (8/13). This more recent publication suggests a broader phenotype associated with CTNND1 variants including dev delay, ADHD/ASD, behavioural issues. Unclear from description whether significant ID present. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2865 | MAOA | Zornitza Stark Mode of inheritance for gene: MAOA was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2864 | MAOA | Zornitza Stark reviewed gene: MAOA: Rating: GREEN; Mode of pathogenicity: None; Publications: 25807999, 24169519; Phenotypes: Brunner syndrome, MIM# 300615; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2854 | KAT5 | Zornitza Stark Phenotypes for gene: KAT5 were changed from to Severe global developmental delay; Intellectual disability; Seizures; Microcephaly; Behavioral abnormality; Sleep disturbance; Morphological abnormality of the central nervous system; Short stature; Oral cleft; Abnormality of the face | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2849 | KAT5 | Konstantinos Varvagiannis reviewed gene: KAT5: Rating: GREEN; Mode of pathogenicity: Loss-of-function variants (as defined in pop up message) DO NOT cause this phenotype - please provide details in the comments; Publications: 32822602; Phenotypes: Severe global developmental delay, Intellectual disability, Seizures, Microcephaly, Behavioral abnormality, Sleep disturbance, Morphological abnormality of the central nervous system, Short stature, Oral cleft, Abnormality of the face; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2849 | LMBRD2 |
Konstantinos Varvagiannis gene: LMBRD2 was added gene: LMBRD2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: LMBRD2 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: LMBRD2 were set to 32820033; https://doi.org/10.1101/797787 Phenotypes for gene: LMBRD2 were set to Global developmental delay; Intellectual disability; Microcephaly; Seizures; Abnormality of nervous system morphology; Abnormality of the eye Penetrance for gene: LMBRD2 were set to unknown Mode of pathogenicity for gene: LMBRD2 was set to Loss-of-function variants (as defined in pop up message) DO NOT cause this phenotype - please provide details in the comments Review for gene: LMBRD2 was set to AMBER Added comment: You may consider inclusion with green (13 individuals with dn missense SNVs overall, overlapping features for 10 with available phenotype / a recurring variant has been identified in 2 different studies) or amber rating (role of the gene not known, no variant studies, animal model probably not available). ► Malhotra et al (2020 - PMID: 32820033) report on 10 unrelated individuals with de novo missense LMBRD2 variants. Features included DD (9/10), ID (6/8 of relevant age), microcephaly (7/10), seizures (5/10 - >=3 different variants), structural brain abnormalities (e.g. thin CC in 6/9), highly variable ocular abnormalities (5/10) and dysmorphic features in some (7/10 - nonspecific). All had variable prior non-diagnostic genetic tests (CMA, gene panel, mendeliome, karyotype). WES/WGS revealed LMBRD2 missense variants, in all cases de novo. A single individual had additional variants with weaker evidence of pathogenicity. 5 unique missense SNVs and 2 recurrent ones (NM_001007527:c.367T>C - p.Trp123Arg / c.1448G>A - p.Arg483His) were identified. These occurred in different exons. Variants were not present in gnomAD and all had several in silico predictions in favor of a deleterious effect. There was phenotypic variability among individuals with the same variant (e.g. seizures in 1/3 and microchephaly in 2/3 of those harboring R483H). The gene has a pLI of 0 (although o/e ranges from 0.23 to 0.55), %HI of 15.13 and z-score of 2.27. The authors presume that haploinsufficiency may not apply, and consider a gain-of-function/dominant-negative effect more likely. As the authors comment LMBRD2 (LMBR1 domain containing 2) encodes a membrane bound protein with poorly described function. It is widely expressed across tissues with notable expression in human brain (also in Drosophila, or Xenopus laevis). It displays high interspecies conservation. It has been suggested (Paek et al - PMID: 28388415) that LMBRD2 is a potential regulator of β2 adrenoreceptor signalling through involvement in GPCR signalling. ► Kaplanis et al (2020 - https://doi.org/10.1101/797787) in a dataset of 31058 parent-offspring trios (WES) previously identified 3 individuals with developmental disorder, harboring c.1448G>A - p.Arg483His. These individuals (1 from the DDD study, and 2 GeneDx patients) appear in Decipher. [ https://decipher.sanger.ac.uk/ddd/research-variant/40e17c78cc9655a6721006fc1e0c98db/overview ]. The preprint by Kaplanis et al is cited by Malhotra et al, with Arg483His reported in 6 patients overall in both studies. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2836 | TAF1C |
Konstantinos Varvagiannis gene: TAF1C was added gene: TAF1C was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: TAF1C was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: TAF1C were set to 32779182 Phenotypes for gene: TAF1C were set to Global developmental delay; Intellectual disability; Spasticity; Strabismus; Seizures; Abnormality of nervous system morphology Penetrance for gene: TAF1C were set to Complete Review for gene: TAF1C was set to AMBER Added comment: Knuutinen et al (2020 - PMID: 32779182) report on 2 individuals from 2 consanguineous families, homozygous for TAF1C missense variants. Both presented with an early onset neurological phenotype with severe global DD, ID (2/2 - moderate and profound), spasticity (2/2), ophthalmic findings (strabismus 2/2, nystagmus 1/2). Epilepsy, abnormal brain MRI (cerebral and cerebellar atrophy and white matter hyperintensities) as well and additional findings were reported in one (always the same individual). Following a normal CMA, exome in the first case revealed a homozygous missense SNV (NM_005679.3:c.1165C>T / p.Arg389Cys) supported by in silico predictions. mRNA and protein levels were substantially reduced in fibroblasts from this subject. Only the patient and parents were tested for the variant but not 3 unaffected sibs (fig1). The second individual was homozygous for another missense variant (p.Arg405Cys) also supported by in silico predictions. The girl was the single affected person within the family with an unaffected sib and parents heterozygous for the variant. Several other unaffected relatives in the extended pedigree were either carriers for this variant or homozygous for the wt allele. TAF1C encodes the TATA-box binding protein associated factor (TAF) RNA polymerase I subunit. RNA polymerase I (Pol I) transcribes genes to produce rRNA. For Pol I to initiate transcription, two transcription factors are required : UBF (upstream binding factor encoded by UBTF) and SL1 (selectivity factor 1). The latter is formed by TBP (TATA-binding protein) and 3 Pol I-specific TBP-associated factors (TAFs). A recurrent de novo missense variant in UBTF (encoding the other Pol I transcription factor) causes a disorder with highly similar features. The specific variant acts through a gain-of-function mechanism (and not by LoF which appears to apply for TAF1C based on expression data). The authors hypothesize that altered Pol I activity and resulting ribosomal stress could cause the microcephaly and leukodystrophy (both reported in 1 - the same - individual). As a result, TAF1C may be considered for inclusion in the ID panel with amber rating pending further evidence. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2833 | FAM50A |
Konstantinos Varvagiannis gene: FAM50A was added gene: FAM50A was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: FAM50A was set to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) Publications for gene: FAM50A were set to 32703943 Phenotypes for gene: FAM50A were set to Mental retardation syndrome, X-linked, Armfield type (MIM #300261) Penetrance for gene: FAM50A were set to unknown Review for gene: FAM50A was set to GREEN Added comment: Lee et al (2020 - PMID: 32703943) provide evidence that Armfield X-Linked intellectual disability syndrome is caused by monoallelic FAM50A pathogenic variants. The current review is based only on this reference. The authors provide clinical details on 6 affected individuals from 5 families. Features included postnatal growth delay, DD and ID (6/6 - also evident for those without formal IQ assesment), seizures (3/6 from 2 families), prominent forehead with presence of other facial features and variable head circumference (5th to >97th %le), ocular anomalies (5/6 - strabismus/nystagmus/Axenfeld-Rieger), cardiac (3/6 - ASD/Fallot) and genitourinary anomalies (3/6). In the first of these families (Armfield et al 1999 - PMID: 10398235), linkage analysis followed by additional studies (Sanger, NGS of 718 genes on chrX, X-exome NGS - several refs provided) allowed the identification of a FAM50A variant. Variants in other families were identified by singleton (1 fam) or trio-ES (3 fam). In affected individuals from 3 families, the variant had occurred de novo. Carrier females in the other families were unaffected (based on pedigrees and/or the original publication). XCI was rather biased in most obligate carrier females from the 1st family (although this ranged from 95:5 to 60:40). Missense variants were reported in all affected subjects incl. Trp206Gly, Asp255Gly, Asp255Asn (dn), Glu254Gly (dn), Arg273Trp (dn) (NM_004699.3). Previous studies have demonstrated that FAM50A has ubiquitous expression in human fetal and adult tissues (incl. brain in fetal ones). Immunostaining suggests a nuclear localization for the protein (NIH/3T3 cells). Comparison of protein levels in LCLs from affected males and controls did not demonstrate significant differences. Protein localization for 3 variants (transfection of COS-7 cells) was shown to be similar to wt. Complementation studies in zebrafish provided evidence that the identified variants confer partial loss of function (rescue of the morpholino phenotype with co-injection of wt but not mt mRNA). The zebrafish ko model seemed to recapitulate the abnormal development of cephalic structures and was indicative of diminished/defective neurogenesis. Transcriptional dysregulation was demonstrated in zebrafish (altered levels and mis-splicing). Upregulation of spliceosome effectors was demonstrated in ko zebrafish. Similarly, mRNA expression and splicing defects were demonstrated in LCLs from affected individuals. FAM50A pulldown followed by mass spectrometry in transfected HEK293T cells demonstrated enrichment of binding proteins involved in RNA processing and co-immunoprecipitation assays (transfected U-87 cells) suggested that FAM50A interacts with spliceosome U5 and C-complex proteins. Overall aberrant spliceosome C-complex function is suggested as the underlying pathogenetic mechanism. Several other neurodevelopmental syndromes are caused by variants in genes encoding C-complex affiliated proteins (incl. EFTUD2, EIF4A3, THOC2, etc.). Please consider inclusion in the ID panel with green rating and epilepsy panel with amber (seizures in individuals from 2 families). Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2821 | BCOR | Zornitza Stark Mode of inheritance for gene: BCOR was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2820 | BCOR | Zornitza Stark reviewed gene: BCOR: Rating: GREEN; Mode of pathogenicity: None; Publications: 29974297; Phenotypes: Microphthalmia, syndromic 2, MIM# 300166, Oculofaciocardiodental syndrome, Lenz microphthalmia; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2820 | ARSE | Zornitza Stark Phenotypes for gene: ARSE were changed from to Chondrodysplasia punctata, X-linked recessive, MIM# 302950 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2818 | ARSE | Zornitza Stark Mode of inheritance for gene: ARSE was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2817 | ARSE | Zornitza Stark reviewed gene: ARSE: Rating: GREEN; Mode of pathogenicity: None; Publications: 20301713; Phenotypes: Chondrodysplasia punctata, X-linked recessive, MIM# 302950; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2813 | PIGQ |
Konstantinos Varvagiannis gene: PIGQ was added gene: PIGQ was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: PIGQ was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: PIGQ were set to 32588908; 24463883; 25558065; 31148362 Phenotypes for gene: PIGQ were set to Epileptic encephalopathy, early infantile, 77 (MIM #618548) Penetrance for gene: PIGQ were set to Complete Review for gene: PIGQ was set to GREEN Added comment: Homozygous or compound heterozygous mutations in PIGQ cause Epileptic encephalopathy, early infantile, 77 (MIM #618548). Johnstone et al (2020 - PMID: 32588908) describe the phenotype of 7 children (from 6 families) with biallelic PIGQ pathogenic variants. The authors also review the phenotype of 3 subjects previously reported in the literature (by Martin et al, Alazami et al, Starr et al - respective PMIDs: 24463883, 25558065, 31148362). Affected individuals displayed severe to profound global DD/ID and seizures with onset in the first year of life. There were variable other features incl. - among others - genitourinary, cardiac, skeletal, ophthalmological anomalies, gastrointestinal issues. Within the cohort there was significant morbidity/mortality. PIGQ encodes phosphatidylinositol glycan anchor biosynthesis class Q protein, playing a role (early) in the biosynthesis of the GPI-anchor. Several genes in the GPI biosynthesis pathway cause multi-system disease with DD/ID and seizures. Flow cytometry has been used in individuals with PIGQ-related disorder. Serum ALP was elevated in some (4) although - as the authors comment - elevations are more typical in disorders affecting later steps of GPI biosynthesis. More than 10 variants have been reported to date (missense / pLoF). Overall PIGQ can be considered for green rating in both ID and epilepsy gene panels. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2807 | PJA1 |
Zornitza Stark gene: PJA1 was added gene: PJA1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: PJA1 was set to X-LINKED: hemizygous mutation in males, biallelic mutations in females Publications for gene: PJA1 were set to 32530565 Phenotypes for gene: PJA1 were set to Intellectual disability; trigonocephaly Review for gene: PJA1 was set to AMBER Added comment: Recurrent variant, p.Arg376Cys, reported in 7 Japanese individuals, supportive mouse model. Individuals shared a common haplotype, suggestive of founder effect. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2806 | SCAF4 |
Crystle Lee gene: SCAF4 was added gene: SCAF4 was added to Intellectual disability syndromic and non-syndromic. Sources: Expert Review Mode of inheritance for gene: SCAF4 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: SCAF4 were set to 32730804 Phenotypes for gene: SCAF4 were set to Mild intellectual disability; seizures; behavioral abnormalities Review for gene: SCAF4 was set to GREEN Added comment: > 5 variants reported in individuals with variable neurodevelopmental disorder characterized by mild intellectual disability, seizures, behavioral abnormalities, and various skeletal and structural anomalies. Sources: Expert Review |
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| Intellectual disability syndromic and non-syndromic v0.2805 | NARS |
Konstantinos Varvagiannis changed review comment from: [Please note that HGNC Approved Gene Symbol for this gene is NARS1] Manole et al (2020 - PMID: 32738225) provide evidence that both biallelic and monoallelic (de novo) pathogenic NARS1 variants cause a neurodevelopmental disorder. In total 32 individuals from 21 families are reported, with biallelic variants identified in individuals from 13 families and de novo in 8 families. Similar features were reported for AR/AD occurrences of the disorder and included of microcephaly (90% - most often primary), epilepsy (23/32 or 74% - variable semiology incl. partial/myoclonic/generalized tonic-clonic seizures), DD and ID (as a universal feature), abnormal tone in several (hypotonia/spasticity), ataxia, demyelinating peripheral neuropathy (in 3 or more for each inheritance mode - or a total of 25%). Some individuals had dysmorphic features. NARS1 encodes an aminoacyl-tRNA synthetase (ARS) [asparaginyl-tRNA synthetase 1]. Aminoacyl-tRNA synthetases constitute a family of enzymes catalyzing attachment of amino-acids to their cognate tRNAs. As the authors comment, mutations in genes encoding several other ARSs result in neurological disorders ranging from peripheral neuropathy to severe multi-systemic NDD. Dominant, recessive or both modes for inheritance for mutations in the same gene (e.g. AARS1, YARS1, MARS1, etc) have been reported. Some variants were recurrent, e.g. the c.1600C>T / p.Arg534* which occurred in 6 families as a de novo event or c.1633C>T p.Arg545Cys (homozygous in 6 families). 3 different variants were reported to have occured de novo (c.965G>T - p.Arg322Leu, c.1525G>A - p.Gly509Ser, p.Arg534*) with several other variants identified in hmz/compound htz individuals. A single SNV (c.1067A>C - p.Asp356Ala) was suggested to be acting as modifier and pathogenic only when in trans with a severe variant. [NM_004539.4 used as RefSeq for all]. The authors provide several lines of evidence for a partial loss-of-function effect (e.g. reduction in mRNA expression, enzyme levels and activity in fibroblasts or iNPCs) underlying pathogenicity of the variants identified in individuals with biallelic variants. A gain-of-function (dominant-negative) effect is proposed for de novo variants (such effect also demonstrated for the p.Arg534* in a zebrafish model). As also Manole et al suggest, NARS1 can be considered for inclusion in gene panels for DD/ID, epilepsy and/or demyelinating neuropathy. Sources: Literature; to: [Please note that HGNC Approved Gene Symbol for this gene is NARS1] Manole et al (2020 - PMID: 32738225) provide evidence that both biallelic and monoallelic (de novo) pathogenic NARS1 variants cause a neurodevelopmental disorder. In total 32 individuals from 21 families are reported, with biallelic variants identified in individuals from 13 families and de novo in 8 families. Similar features were reported for AR/AD occurrences of the disorder and included microcephaly (90% - most often primary), epilepsy (23/32 or 74% - variable semiology incl. partial/myoclonic/generalized tonic-clonic seizures), DD and ID (as a universal feature), abnormal tone in several (hypotonia/spasticity), ataxia, demyelinating peripheral neuropathy (in 3 or more for each inheritance mode - or a total of 25%). Some individuals had dysmorphic features. NARS1 encodes an aminoacyl-tRNA synthetase (ARS) [asparaginyl-tRNA synthetase 1]. Aminoacyl-tRNA synthetases constitute a family of enzymes catalyzing attachment of amino-acids to their cognate tRNAs. As the authors comment, mutations in genes encoding several other ARSs result in neurological disorders ranging from peripheral neuropathy to severe multi-systemic NDD. Dominant, recessive or both modes for inheritance for mutations in the same gene (e.g. AARS1, YARS1, MARS1, etc) have been reported. Some variants were recurrent, e.g. the c.1600C>T / p.Arg534* which occurred in 6 families as a de novo event or c.1633C>T p.Arg545Cys (homozygous in 6 families). 3 different variants were reported to have occured de novo (c.965G>T - p.Arg322Leu, c.1525G>A - p.Gly509Ser, p.Arg534*) with several other variants identified in hmz/compound htz individuals. A single SNV (c.1067A>C - p.Asp356Ala) was suggested to be acting as modifier and pathogenic only when in trans with a severe variant. [NM_004539.4 used as RefSeq for all]. The authors provide several lines of evidence for a partial loss-of-function effect (e.g. reduction in mRNA expression, enzyme levels and activity in fibroblasts or iNPCs) underlying pathogenicity of the variants identified in individuals with biallelic variants. A gain-of-function (dominant-negative) effect is proposed for de novo variants (such effect also demonstrated for the p.Arg534* in a zebrafish model). As also Manole et al suggest, NARS1 can be considered for inclusion in gene panels for DD/ID, epilepsy and/or demyelinating neuropathy. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2805 | NARS |
Konstantinos Varvagiannis gene: NARS was added gene: NARS was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: NARS was set to BOTH monoallelic and biallelic, autosomal or pseudoautosomal Publications for gene: NARS were set to 32738225 Phenotypes for gene: NARS were set to Abnormal muscle tone; Microcephaly; Global developmental delay; Intellectual disability; Seizures; Ataxia; Abnormality of the face; Demyelinating peripheral neuropathy Penetrance for gene: NARS were set to Complete Review for gene: NARS was set to GREEN Added comment: [Please note that HGNC Approved Gene Symbol for this gene is NARS1] Manole et al (2020 - PMID: 32738225) provide evidence that both biallelic and monoallelic (de novo) pathogenic NARS1 variants cause a neurodevelopmental disorder. In total 32 individuals from 21 families are reported, with biallelic variants identified in individuals from 13 families and de novo in 8 families. Similar features were reported for AR/AD occurrences of the disorder and included of microcephaly (90% - most often primary), epilepsy (23/32 or 74% - variable semiology incl. partial/myoclonic/generalized tonic-clonic seizures), DD and ID (as a universal feature), abnormal tone in several (hypotonia/spasticity), ataxia, demyelinating peripheral neuropathy (in 3 or more for each inheritance mode - or a total of 25%). Some individuals had dysmorphic features. NARS1 encodes an aminoacyl-tRNA synthetase (ARS) [asparaginyl-tRNA synthetase 1]. Aminoacyl-tRNA synthetases constitute a family of enzymes catalyzing attachment of amino-acids to their cognate tRNAs. As the authors comment, mutations in genes encoding several other ARSs result in neurological disorders ranging from peripheral neuropathy to severe multi-systemic NDD. Dominant, recessive or both modes for inheritance for mutations in the same gene (e.g. AARS1, YARS1, MARS1, etc) have been reported. Some variants were recurrent, e.g. the c.1600C>T / p.Arg534* which occurred in 6 families as a de novo event or c.1633C>T p.Arg545Cys (homozygous in 6 families). 3 different variants were reported to have occured de novo (c.965G>T - p.Arg322Leu, c.1525G>A - p.Gly509Ser, p.Arg534*) with several other variants identified in hmz/compound htz individuals. A single SNV (c.1067A>C - p.Asp356Ala) was suggested to be acting as modifier and pathogenic only when in trans with a severe variant. [NM_004539.4 used as RefSeq for all]. The authors provide several lines of evidence for a partial loss-of-function effect (e.g. reduction in mRNA expression, enzyme levels and activity in fibroblasts or iNPCs) underlying pathogenicity of the variants identified in individuals with biallelic variants. A gain-of-function (dominant-negative) effect is proposed for de novo variants (such effect also demonstrated for the p.Arg534* in a zebrafish model). As also Manole et al suggest, NARS1 can be considered for inclusion in gene panels for DD/ID, epilepsy and/or demyelinating neuropathy. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2804 | ZNF407 |
Konstantinos Varvagiannis gene: ZNF407 was added gene: ZNF407 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: ZNF407 was set to BOTH monoallelic and biallelic, autosomal or pseudoautosomal Publications for gene: ZNF407 were set to 24907849; 32737394; 23195952 Phenotypes for gene: ZNF407 were set to Global developmental delay; Intellectual disability Penetrance for gene: ZNF407 were set to unknown Review for gene: ZNF407 was set to AMBER Added comment: You may consider inclusion of this gene probably with amber rating (or green if the evidence for biallelic variants is considered sufficient). Biallelic variants: - Kambouris et al. (2014 - PMID: 24907849) described 2 brothers with severe DD and ID, born to first cousin parents. Homozygosity mapping, following other non-diagnostic investigations (incl. aCGH), revealed 4 major homozygosity intervals. Exome sequencing in one identified 5 variants within these intervals, ZNF407 (c.5054C>G, p.Ser1685Trp) being the best candidate, supported also by segregation studies. The authors commented that zinc finger proteins act as transcriptional regulators, with mutations in genes encoding for other zinc finger proteins interfering with normal brain development. - Zahra et al. (2020 - PMID: 32737394) report on 7 affected individuals (from 3 families) homozygous or compound heterozygous for ZNF407 variants. Features included hypotonia, DD and ID (in all) and variable occurrence of short stature (6/6), microcephaly (in at least 5), behavioural, visual problems and deafness. Linkage analysis in the first family revealed a 4.4 Mb shared homozygosity region and exome (30x) revealed a 3-bp duplication, confirmed by Sanger sequencing and segregating with the disease (NM_001146189:c.2814_2816dup, p.Val939dup). Affected subjects from the 2 other families were each found to be homozygous (c.2405G>T) or compound heterozygous (c.2884C>G, c.3642G>C) for other variants. Segregation was compatible in all families. Other studies were not performed. The authors comment than only the 3-bp duplication fullfilled ACMG criteria for classification as LP, the other variants being all formally classified as VUS (also due to in silico predictions predicting a LB effect). In addition, while several features such as DD/ID and short stature appeared to be frequent among all patients reported, Zahra et all comment that there was partial clinical overlap with the sibs described by Kambouris et al (additional variants?). Monoallelic disruption of ZNF407: - Ren et al (2013 - PMID: 23195952) described an 8 y.o. boy with ID and ASD. The boy was found to harbor a de novo translocation between chromosomes 3 and 18 [46,XY,t(3;18)(p13;q22.3)]. Array CGH did not reveal any P/LP CNV. Delineation of the breakpoints (FISH, long-range PCR) revealed that the chr18 breakpoint disrupted intron 3 of ZNF407 (isoform 1) with the other breakpoint within a gene-free region of exon 3. There was a loss of 4-8 nt in chr18 and 2-6 in chr3. Sequencing of ZNF407 did not reveal additional variants. RNA isolation in blood followed by RT-PCR studied expression of all 3 ZNF407 isoforms (the intronic region being shared by isoforms 1 and 2). Expression of isoform 1 was shown to be significantly reduced compared to controls. Isoform 2 was undetectable (in blood) while isoform 3 expression was similar to controls. Sequencing of 105 additional patients with similar clinical presentation (ID & ASD) revealed 2 further individuals with de novo missense variants. - Based on the discussion by Kambouris et al (PMID: 24907849 - cited literature not here reviewed) ZNF407 may be deleted in patients with congenital aural atresia due to deletion of a critical region of 18q22.3 (though TSHZ1 is responsible for this phenotype) or 18q- although such deletions span several other genes (cited PMID: 16639285). In one case the breakpoint was shown to be disrupting ZNF407 (cited PMID: 24092497). - The denovo db and Decipher (research variant tab) list few individuals with de novo ZNF407 SNVs although these do not seem to allow conclusions. https://denovo-db.gs.washington.edu/denovo-db/QueryVariantServlet?searchBy=Gene&target=ZNF407 https://decipher.sanger.ac.uk/search/ddd-research-variants/results?q=znf407 Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2803 | MAPK1 |
Konstantinos Varvagiannis gene: MAPK1 was added gene: MAPK1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: MAPK1 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: MAPK1 were set to 32721402 Phenotypes for gene: MAPK1 were set to Global developmental delay; Intellectual disability; Behavioral abnormality; Growth delay; Abnormality of the face; Abnormality of the neck; Abnormality of the cardiovascular system; Abnormality of the skin Penetrance for gene: MAPK1 were set to unknown Mode of pathogenicity for gene: MAPK1 was set to Loss-of-function variants (as defined in pop up message) DO NOT cause this phenotype - please provide details in the comments Review for gene: MAPK1 was set to GREEN Added comment: Motta et al (2020 - PMID: 32721402) report on 7 unrelated individuals harboring de novo missense MAPK1 pathogenic variants. The phenotype corresponded to a neurodevelopmental disorder and - as the authors comment - consistently included DD, ID , behavioral problems. Postnatal growth delay was observed in approximately half. Hypertelorism, ptosis, downslant of palpebral fissures, wide nasal bridge as low-set/posteriorly rotated ears were among the facial features observed (each in 3 or more subjects within this cohort). Together with short/webbed neck and abnormalities of skin (lentigines / CAL spots) and growth delay these led to clinical suspicion of Noonan s. or disorder of the same pathway in some. Congenital heart defects (ASD, mitral valve insufficiency, though not cardiomyopathy) occurred in 4/7. Bleeding diathesis and lymphedema were reported only once. MAPK1 encodes the mitogen-activated protein kinase 1 (also known as ERK2) a serine/threonine kinase of the RAS-RAF-MEK-(MAPK/)ERK pathway. MAPK1 de novo variants were identified in all individuals following trio exome sequencing (and extensive previous genetic investigations which were non-diagnostic). The distribution of variants, as well as in silico/vitro/vivo studies suggest a GoF effect (boosted signal through the MAPK cascade. MAPK signaling also upregulated in Noonan syndrome). The authors comment that screening of 267 additional individuals with suspected RASopathy (without mutations in previously implicated genes) did not reveal other MAPK1 variants. Overall this gene can be considered for inclusion in the ID panel with green rating. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2790 | LARS |
Konstantinos Varvagiannis gene: LARS was added gene: LARS was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: LARS was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: LARS were set to 32699352 Phenotypes for gene: LARS were set to Infantile liver failure syndrome 1, MIM# 615438 Penetrance for gene: LARS were set to Complete Review for gene: LARS was set to GREEN Added comment: Please consider inclusion with amber/green rating in the current panel. Biallelic pathogenic LARS1 variants cause Infantile liver failure syndrome 1, MIM# 615438. Lenz et al (2020 - PMID: 32699352) review the phenotype of 25 affected individuals from 15 families. Seizures occurred in 19/24 and were commonly associated with infections. Encephalopathic episodes (in 13 patients) accompanied by seizures up to status epilepticus occurred independently of hepatic decompensation. In addition 22/24 presented with neurodevelopmental delay. The authors comment that cognitive impairment was present in 13/17 individuals (mild-severe) whereas most presented with learning disabilities. These patients will most likely investigated for their liver disease (although presentation was highly variable and/or very mild in few). The gene encodes a cytoplasmic amino-acyl tRNA synthetase (ARS) with neurologic manifestations observed in almost all patients (and seizures / DD and ID common to other disorders due to mutations in other genes encoding for ARSs). Please note that the HGNC approved symbol for this gene is LARS1. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2783 | MORC2 |
Konstantinos Varvagiannis gene: MORC2 was added gene: MORC2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: MORC2 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: MORC2 were set to https://doi.org/10.1016/j.ajhg.2020.06.013 Phenotypes for gene: MORC2 were set to Charcot-Marie-Tooth disease, axonal, type 2Z, MIM #616688 Penetrance for gene: MORC2 were set to unknown Mode of pathogenicity for gene: MORC2 was set to Loss-of-function variants (as defined in pop up message) DO NOT cause this phenotype - please provide details in the comments Review for gene: MORC2 was set to GREEN Added comment: The current review is based on a recent report by Sacoto et al (2020 - https://doi.org/10.1016/j.ajhg.2020.06.013). While several previous studies focused on the phenotype of axonal motor and senory neuropathy in individuals with heterozygous MORC2 pathogenic variants (Charcot-Marie-Tooth disease, axonal, type 2Z, MIM #616688) some of them presented among others with hypotonia, muscle weakness, intellectual disability, microcephaly or hearing loss [refs provided by Sacoto et al - learning disabilities (in some patients) also listed in OMIM's clinical synopsis]. Sacoto et al present a cohort of 20 individuals having genetic testing for developmental delay or growth failure (with a single one for a diagnosis of sensorimotor neuropathy). Overlapping features included DD, ID (18/20 - mild to severe), short stature (18/20), microcephaly (15/20) and variable craniofacial dysmorphisms. The authors comment that features suggestive of neuropathy (weakness, hyporeflexia, abnormal EMG/NCS) were frequent but not the predominant complaint. EMG/NCS abnormalities were abnormal in 6 out of 10 subjects investigated in this cohort. Other findings included brain MRI abnormalities (12/18 - in 5/18 Leigh-like lesions), hearing loss (11/19) and pigmentary retinopathy in few (5). Affected subjects were found to harbor in all cases missense variants in the ATPase module of MORC2 [residues 1 to 494 - NM_001303256.1 - the module consists of an ATPase domain (aa 1-265), a transducer S5-like domain (266-494) and a coiled-coiled domain (CC1 - aa 282-361)]. Variants had occured mostly as de novo events although inheritance from a similarly affected parent was also reported. Some of them were recurring within this cohort and/or the literature eg. c.79G>A/p.Glu27Lys (x5), c.260C>T/p.Ser87Leu (x2), c.394C>T/p.Arg132Cys (4x), c.1164C>G/p.Ser388Arg (x2), c.1181A>G/p.Tyr394Cys (x3). MORC2 encodes an ATPase involved in chromatin remodeling, DNA repair and transcriptional regulation. Chromatin remodeling and epigenetic silencing by MORC2 is mediated by the HUSH (Human Silencing Hub) complex. Functional studies (MORC2-knockout HeLa cells harboring a HUSH-sensitive GFP reporter were transduced with wt or mt MORC2 followed by measurement of reporter repression) supported the deleterious effect of most variants known at the time (hyperactivation of HUSH-mediating silencing, in line with previous observations). Overall this gene can be considered for inclusion in the ID panel with green rating. Also other gene panels (e.g. for short stature, microcephaly, hearing loss, pigmentary retinopathy, etc) if it meets the respective criteria for inclusion. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2781 | HDAC8 | Zornitza Stark Mode of inheritance for gene: HDAC8 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2780 | HDAC8 | Zornitza Stark reviewed gene: HDAC8: Rating: GREEN; Mode of pathogenicity: None; Publications: 30614194, 24403048; Phenotypes: Cornelia de Lange syndrome 5, MIM# 300882; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2777 | NSDHL | Zornitza Stark Mode of inheritance for gene: NSDHL was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2776 | NSDHL | Crystle Lee reviewed gene: NSDHL: Rating: GREEN; Mode of pathogenicity: None; Publications: 21129721, 15689440, 25900314; Phenotypes: CK syndrome (MIM#300831); Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2750 | CNPY3 |
Konstantinos Varvagiannis gene: CNPY3 was added gene: CNPY3 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: CNPY3 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: CNPY3 were set to 29394991; 30237576 Phenotypes for gene: CNPY3 were set to Epileptic encephalopathy, early infantile, 60 (MIM 617929) Penetrance for gene: CNPY3 were set to Complete Review for gene: CNPY3 was set to GREEN Added comment: Biallelic CNPY3 mutations cause Epileptic encephalopathy, early infantile, 60 (MIM 617929). The phenotype including among others hypotonia, intractable seizures, DD and ID has been first reported by Mutoh et al (2018 - PMID: 29394991) in 3 subjects from 2 families. Evidence was provided for the role of the gene (incl. mouse model) and pathogenicity of the identified variants (resulting in LoF). Another subject with similar features of hypotonia, DD, intractable epilepsy, feeding problems has been described briefly by Maddirevula et al (2019 - PMID: 30237576). Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2750 | KIF21B |
Konstantinos Varvagiannis gene: KIF21B was added gene: KIF21B was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: KIF21B was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: KIF21B were set to 32415109 Phenotypes for gene: KIF21B were set to Global developmental delay; Intellectual disability; Abnormality of brain morphology; Microcephaly Penetrance for gene: KIF21B were set to unknown Mode of pathogenicity for gene: KIF21B was set to Loss-of-function variants (as defined in pop up message) DO NOT cause this phenotype - please provide details in the comments Review for gene: KIF21B was set to GREEN Added comment: Asselin et al (2020 - PMID: 32415109) report on 4 individuals with KIF21B pathogenic variants. DD/ID (borderline intellectual functioning to severe ID) was a feature in all. Variable other findings included brain malformations (CCA) and microcephaly. 3 missense variants and a 4-bp insertion were identified, in 3 cases as de novo events while in a single subject the variant was inherited from the father who was also affected. The authors provide evidence for a role of KIF21B in the regulation of processes involved in cortical development and deleterious effect of the missense variants impeding neuronal migration and kinesin autoinhibition. Phenotypes specific to variants (e.g. CCA or microcephaly) were recapitulated in animal models. Missense variants are thought to exert a gain-of-function effect. As commented on, the 4-bp duplication (/frameshift) variant might not be pathogenic. In blood sample from the respective individual, RT-qPCR analysis suggested that haploinsufficiency (NMD) applies. Although Kif21b haploinsufficiency in mice was shown to lead to impaired neuronal positioning, the gene might partially tolerate LoF variants as also suggested by 28 such variants in gnomAD. Homozygous Kif21b ko mice display severe morphological abnormalities, partial loss of commissural fibers, cognitive deficits and altered synaptic transmission (several refs to previous studies provided by the authors). Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2750 | PAX1 |
Konstantinos Varvagiannis gene: PAX1 was added gene: PAX1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature,Radboud University Medical Center, Nijmegen Mode of inheritance for gene: PAX1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: PAX1 were set to 29681087; 23851939; 28657137 Phenotypes for gene: PAX1 were set to Otofaciocervical syndrome 2, 615560 Penetrance for gene: PAX1 were set to Complete Review for gene: PAX1 was set to AMBER Added comment: Biallelic PAX1 pathogenic variants cause Otofaciocervical syndrome 2 (OMIM 615560). Brief review of the literature suggests 3 relevant publications to date (04-07-2020). 2 individuals with DD and ID have been reported (Patil et al, 2018 - PMID: 29681087 and Pohl et al, 2013 - PMID: 23851939). Other subjects reported were only evaluated as newborns(mostly)/infants [Paganini et al, 2017 - PMID: 28657137, Patil et al, 2018 - PMID: 29681087]. While the first report by Pohl et al identified a homozygous missense variant supported by functional studies [NM_006192.5:c.497G>T - p.(Gly166Val)] subsequent ones identified homozygosity for pLoF mutations [Patil et al: NM_006192.4:c.1173_1174insGCCCG / Paganini et al: NM_006192:c.1104C>A - p.(Cys368*)]. As discussed by Pohl et al: PAX1 encodes a transcription factor with critical role in pattern formation during embryogenesis. Study of the mouse Gly157Val (equivalent to human Gly166Val) Pax1 variant suggested reduced binding affinity (reduced transactivation of a regulatory sequence of the Nkx3-2 promoter) and hypofunctional nature of this variant. Mouse models seem to recapitulate features of the disorder (skeletal, immunodeficiency) while the role of Pax1 in hearing process was thought to be supported by early expression (P6) in mouse cochlea. Overall this gene can be considered for inclusion in the ID panel with amber/green rating. Sources: Literature, Radboud University Medical Center, Nijmegen |
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| Intellectual disability syndromic and non-syndromic v0.2750 | TMEM106B |
Konstantinos Varvagiannis gene: TMEM106B was added gene: TMEM106B was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: TMEM106B was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: TMEM106B were set to 29186371; 29444210; 32595021 Phenotypes for gene: TMEM106B were set to Leukodystrophy, hypomyelinating, 16 (MIM #617964) Penetrance for gene: TMEM106B were set to Complete Mode of pathogenicity for gene: TMEM106B was set to Loss-of-function variants (as defined in pop up message) DO NOT cause this phenotype - please provide details in the comments Review for gene: TMEM106B was set to GREEN Added comment: 6 unrelated individuals with Leukodystrophy, hypomyelinating, 16 (MIM #617964) due to a recurrent TMEM106B variant have been reported to date in the literature (Simons et al 2017 - PMID: 29186371, Yan et al 2018 - PMID: 29444210, Ikemoto et al 2020 - PMID: 32595021). While a 3 y.o. female described by Yan et al had DD (eg sitting at 9m, walking at 25m) with normal cognitive functioning, and a 38 y.o. female had borderline intellectual functioning (IQ 76), 4 affected individuals had ID. Among them, a 19 y.o. male with severe ID was also found to harbor a second de novo possibly damaging USP7 variant. Seizures have been reported in 2 unrelated subjects. [Clinical features are also summarized in table 1 - Ikemoto et al]. All harbored NM_001134232.2(TMEM106B):c.754G>A (p.Asp252Asn) which in almost all cases occurred as a de novo event. In a single case this variant was inherited from a mosaic parent with mild DD in infancy but normal cognition (reported by Simons et al). As discussed by Ito et al (2018 - PMID: 30643851) the encoded protein is a structural component of the lysosomal membrane, playing a role on lysosome acidification. Acidity of the lysosome mediates multiple aspects of lysosomal function. Ito et al, using patient-derived fibroblasts assessed mRNA and protein levels. These were unaltered compared with controls. While TMEM106B had been previously shown to affect lysosome number, morphology and acidification, Ito et al demonstrated increased number of lysosomes in patient cells as well as impaired acidification compared to controls. As commented lysosomes are required for generation of myelin. Recurrence of this missense variant, the presence of pLoF TMEM106B variants in gnomAD as well as the phenotypically normal Tmem106b null mice suggest that this variant may have a gain-of-function or dominant negative effect. Genes for other forms of hypomyelinating lipodystrophy (incl. PLP1) have green rating in the ID panel. Overall TMEM106B can be considered for the ID panel with green rating and the epilepsy panel with amber rating. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2750 | EXOC2 |
Konstantinos Varvagiannis gene: EXOC2 was added gene: EXOC2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: EXOC2 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: EXOC2 were set to 32639540 Phenotypes for gene: EXOC2 were set to Global developmental delay; Intellectual disability; Abnormality of the face; Abnormality of brain morphology Penetrance for gene: EXOC2 were set to Complete Review for gene: EXOC2 was set to AMBER Added comment: Van Bergen et al (2020 - PMID: 32639540) report on 3 individuals from 2 families, harboring biallelic EXOC2 mutations. Clinical presentation included DD, ID (severe in 2 subjects from fam1, borderline intellectual functioning in fam2), dysmorphic features and brain abnormalities. Cerebellar anomalies were common to all with a molar tooth sign observed in one (1/3). Other findings limited to subjects from one family included acquired microcephaly, congenital contractures, spastic quadriplegia (each observed 2/3). Previous investigations were in all cases non-diagnostic. WES identified biallelic EXOC2 mutations in all affected individuals. EXOC2 encodes an exocyst subunit. The latter is an octameric complex, component of the membrane transport machinery, required for tethering and fusion of vesicles at the plasma membrane. As discussed ,vesicle transport is important for the development of brain and the function of neurons and glia. Exocyst function is also important for delivery of Arl13b to the primary cilium (biallelic ARL13B mutations cause Joubert syndrome 8) and ciliogenesis. Affected subjects from a broader consanguineous family (fam1) were homozygous for a truncating variant. Fibroblast studies revealed mRNA levels compatible with NMD (further restored in presence of CHX) as well as reduced protein levels. The female belonging to the second non-consanguineous family was found to harbor 2 missense variants in trans configuration. An exocytosis defect was demonstrated in fibroblasts from individuals belonging to both families. Ciliogenesis appeared to be normal, however Arl13b localization/recruitment to the cilia was reduced compared with control cells with the defect rescued upon exogenous expression of wt EXOC2. Mutations in other genes encoding components of the exocyst complex have been previously reported in individuals with relevant phenotypes (e.g. EXOC8 in a boy with features of Joubert s. or EXOC4 in nephrotic syndrome). The authors discuss on the essential role of EXOC2 based on model organism studies (e.g. impaired neuronal membrane traffic, failure of neuronal polarization and neuromuscular junction expansion seen in Drosophila Sec5 (EXOC2) null mutants). Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2750 | ABCA2 |
Konstantinos Varvagiannis gene: ABCA2 was added gene: ABCA2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: ABCA2 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: ABCA2 were set to 30237576; 29302074; 31047799 Phenotypes for gene: ABCA2 were set to Intellectual developmental disorder with poor growth and with or without seizures or ataxia, 618808 Penetrance for gene: ABCA2 were set to Complete Review for gene: ABCA2 was set to GREEN Added comment: Biallelic pathogenic ABCA2 variants cause Intellectual developmental disorder with poor growth and with or without seizures or ataxia (MIM 618808). There are 3 relevant publications (01-07-2020) : - Maddirevula et al [2019 - PMID: 30237576] described briefly 2 unrelated subjects (16-2987, 16DG0071) both DD and seizures among other manifestations. - Hu et al [2019 - PMID: 29302074] reported 3 sibs (M8600615 - III:1-3) born to consanguineous parents (M8600615 - III:1-3) with DD/ID (formal confirmation of moderate ID, in those (2) evaluated). One also presented with seizures. - Aslam and Naz [2019 - PMID: 31047799] provided clinical details on 2 siblings born to consanguineous parents. ID was reported for the older sib but was absent in the younger one. Seizures were not part of the phenotype. All subjects harbored biallelic pLoF variants. N.B. : Steinberg et al [2015 - PMID: 25773295], within a cohort of patients with ALS, identified one with biallelic ABCA2 variants. As however Aslam and Naz comment, this person harbored a single pathogenic variant, with a second one rather unlikely to be pathogenic due to high allele frequency. Overall this gene can be considered for inclusion with green rating in both ID and epilepsy panels (each in >=3 unrelated individuals). Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2748 | RPL10 | Zornitza Stark Mode of inheritance for gene: RPL10 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2747 | RPL10 | Crystle Lee reviewed gene: RPL10: Rating: GREEN; Mode of pathogenicity: None; Publications: 25316788, 26290468, 25846674, 29066376; Phenotypes: Mental retardation, X-linked, syndromic, 35 (MIM#300998); Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2736 | SLC12A2 | Seb Lunke Phenotypes for gene: SLC12A2 were changed from Kilquist syndrome; deafness; intellectual disability; dysmorphic features; absent salivation to Kilquist syndrome; deafness; intellectual disability; dysmorphic features; absent salivation; ectodermal dysplasia; constipation; intestinal malrotation; multiple congenital anomalies | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2734 | SLC12A2 | Seb Lunke reviewed gene: SLC12A2: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: ectodermal dysplasia, constipation, intestinal malrotation, multiple congenital anomalies; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal; Current diagnostic: yes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2726 | CAPZA2 |
Zornitza Stark gene: CAPZA2 was added gene: CAPZA2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: CAPZA2 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: CAPZA2 were set to 32338762 Phenotypes for gene: CAPZA2 were set to Intellectual disability Review for gene: CAPZA2 was set to AMBER Added comment: PMID: 32338762 - Huang et al 2020 - report 2 unrelated families (Chinese and European) in which a de novo heterozygous variant has been identified in CAPZA2 in paediatric probands that present with global motor development delay, speech delay, intellectual disability, hypotonia. One proband had seizures at 7 months but these were controlled with medication and did not repeat. The other proband at age one had an atypical febrile seizure that was controlled without medication. Functional studies in Drosophila suggest that these variants are mild loss of function mutations but that they can act as dominant negative variants in actin polymerization in bristles. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2720 | HNRNPH1 |
Chirag Patel gene: HNRNPH1 was added gene: HNRNPH1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: HNRNPH1 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: HNRNPH1 were set to PMID: 32335897; 29938792 Phenotypes for gene: HNRNPH1 were set to HNRNPH1 ‐related syndromic intellectual disability Review for gene: HNRNPH1 was set to GREEN Added comment: 1st patient reported in 2018 with intellectual disability and dysmorphic features and HNRNPH1 heterozygous missense variant. 2020 paper reports additional 7 cases with ID, short stature, microcephaly, distinctive dysmorphic facial features, and congenital anomalies (cranial, brain, genitourinary, palate, ophthalmologic). They all had HNRNPH1 heterozygous pathogenic variants (missense, frameshift, in‐frame deletion, entire gene duplication) and were identified using clinical networks and GeneMatcher. No comments in paper if all de novo. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2719 | PDCD6IP |
Chirag Patel gene: PDCD6IP was added gene: PDCD6IP was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: PDCD6IP was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: PDCD6IP were set to PMID: 32286682 Phenotypes for gene: PDCD6IP were set to Primary microcephaly Review for gene: PDCD6IP was set to RED Added comment: One consanguineous family with 2 affected sibs with primary microcephaly (-4SD), intellectual disability and short stature (-5/6SD), and homozygous frameshift variant in PDCD6IP. The homozygous variant was confirmed in both affected sibs, while the four healthy siblings and parents were heterozygous. The clinical features observed in the patients were similar to the phenotypes observed in mouse and zebrafish models of PDCD6IP mutations in previous studies. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2710 | UBE2A | Zornitza Stark Mode of inheritance for gene: UBE2A was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2709 | UBE2A | Crystle Lee reviewed gene: UBE2A: Rating: GREEN; Mode of pathogenicity: None; Publications: 24053514, 16909393; Phenotypes: Mental retardation, X-linked syndromic, Nascimento-type (MIM#300860); Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2700 | NEXMIF | Zornitza Stark Mode of inheritance for gene: NEXMIF was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2699 | NEXMIF | Zornitza Stark reviewed gene: NEXMIF: Rating: GREEN; Mode of pathogenicity: None; Publications: 27358180; Phenotypes: Mental retardation, X-linked 98 300912; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2659 | TTC5 |
Konstantinos Varvagiannis gene: TTC5 was added gene: TTC5 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: TTC5 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: TTC5 were set to 29302074; 32439809 Phenotypes for gene: TTC5 were set to Central hypotonia; Global developmental delay; Intellectual disability; Abnormality of nervous system morphology; Microcephaly; Abnormality of the face; Behavioral abnormality; Abnormality of the genitourinary system Penetrance for gene: TTC5 were set to Complete Review for gene: TTC5 was set to GREEN Added comment: Hu et al (2019 - PMID: 29302074) reported briefly on 3 individuals from 2 consanguineous families (from Turkey and Iran) with biallelic TTC5 variants. Features included DD (3/3), ID (severe in 2/2 with relevant age), microcephaly (3/3), brain abnormalities, etc. A nonsense and a variant affecting splice site were identified by WES/WGS. --- In a recent report, Rasheed et al (2020 - PMID: 32439809) report on the phenotype of 8 individuals - belonging to 5 consanguineous families - all 8 harboring homozygous TTC5 mutations. Frequent features included hypotonia (6/8), motor and speech delay, moderate to severe ID (10/10 of relevant age - inclusion of less severely affected subjects was not considered by study design), brain MRI abnormalities (8/8). Other findings included microcephaly in some (6/11), behavioral abnormalities in few (autistic behavior in 2/8, aggression in 2/8), genitourinary anomalies (2/8), seizures (1/11). Facial phenotype incl. thin V-shaped upper lip, low-set ears (in most) and/or additional features. TTC5 encodes a 440 aa protein, functioning as a scaffold to stabilise p300-JMY interactions. Apart from this role in nucleus, it has functions in the cytoplasm (inhibiting actin nucleataion, autophagosome formation, etc). The gene has ubiquitous expression, highest in brain. All variants were identified following WES - as the best candidates - in affected individuals with compatible Sanger studies in all affected family members and carrier parents. 2 missense and 2 nonsense variants were identified with the 2 missense SNVs localizing within TPR domains. qRT-PCR studies for a nonsense variant localizing 19 nt before the last exon, revealed fourfold decreased expression in affected individuals compared to carriers. Families from Egypt shared a homozygous ~6.3 Mb haplotype block spanning TTC5, suggesting that p.(Arg263Ter) is likely a founder mutation. The authors underscore some phenotypic (though not facial) similarities with Rubinstein-Taybi syndrome 2 due to EP300 mutations (in line with the role of TTC5). Biallelic variants in genes encoding other members of the TTC family (containing a TPR motif), e.g. TTC8 or TTC15 cause disorders with neurologic manifestations (and DD/ID). Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2653 | RBM10 | Zornitza Stark Mode of inheritance for gene: RBM10 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2652 | RBM10 | Michelle Torres reviewed gene: RBM10: Rating: GREEN; Mode of pathogenicity: None; Publications: 24259342, 24000153, 30462380; Phenotypes: TARP syndrome, 311900 (3), X-linked recessive; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females; Current diagnostic: yes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2631 | NR4A2 | Konstantinos Varvagiannis reviewed gene: NR4A2: Rating: GREEN; Mode of pathogenicity: None; Publications: https://doi.org/10.1038/s41436-020-0815-4, 31428396, 29770430, 30504930, 28544326, 27569545, 23554088, 28135719, 27479843, 25363768; Phenotypes: Generalized hypotonia, Global developmental delay, Intellectual disability, Seizures, Behavioral abnormality, Abnormality of movement, Joint hypermobility; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2629 | CUL3 |
Konstantinos Varvagiannis gene: CUL3 was added gene: CUL3 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: CUL3 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: CUL3 were set to 32341456 Phenotypes for gene: CUL3 were set to Global developmental delay; Intellectual disability; Seizures; Abnormality of cardiovascular system morphology; Abnormality of the palate; Pseudohypoaldosteronism, type IIE - MIM #614496 Penetrance for gene: CUL3 were set to unknown Review for gene: CUL3 was set to GREEN Added comment: Please consider inclusion with amber / green rating. -- Nakashima et al (2020 - PMID:32341456) provide clinical details on 3 unrelated individuals with de novo CUL3 variants. Features included DD, variable degrees of ID (P1: severe, P3: mild, P2: NA although he displayed motor and severe speech and language delay and had severe learning difficulties). Two out of three had intractable seizures (onset 2 - 6 months). One presented with congenital heart defects (ASD, PV stenosis) and another submucosal palatoschisis/bifid uvula. There were no facial dysmorphisms reported. CUL3 encodes Cullin-3, a core piece of the E3 ubiquitin ligase complex, thus playing a role in the ubiquitin-proteasome system. [ https://ghr.nlm.nih.gov/gene/CUL3 ]. Germline variants in some other Cullin family genes (eg. CUL4B, CUL7) cause disorders with ID as a feature. The 3 individuals reported by Nakashima had variable previous investigations (karyotype, CMA, metabolic testing) which were non-diagnostic. Singleton or trio exome sequencing identified 2 frameshift and 1 missense variant (NM_003590.4:c.854T>C / p.Val285Ala), further confirmed with Sanger sequencing. De novo occurrence was confirmed by analysis of microsatellite markers in an individual with singleton ES. While the frameshift variants were presumed to lead to NMD (not studied), studies in HEK293T cells suggested that the Val285Ala reduced binding ability with KEAP1, possibly leading to instability of the Cullin-RING ligase (CRL) complex and impairment of the ubiquitin-proteasome system. In OMIM, the phenotype associated with heterozygous CUL3 mutations is Pseudohypoaldosteronism type IIE (PHA2E - # 614496). As OMIM and Nakashima et al comment, PHA2E-associated variants are clustered around exon 9, most lead to skipping of exon 9 and produce an in-frame deletion of 57 aa in the cullin homology domain. Few (probably 3) missense variants in exon 9 have also been reported. Individuals with PHA2E do not display DD/ID and conversely individuals with NDD did not display features of PHA2E. Nakashima et al summarize the phenotypes associated with 12 further de novo CUL3 variants in the literature with most pLOF ones detected in individuals with autism and/or developmental disorders and in few cases with congenital heart disease. Few additional missense variants and a stoploss one have been reported in individuals with NDD and one in SCZ. Heterozygous Cul3 (/tissue-specific) deletion in mice resulted in autism-like behavior. Cul3 deficient mice also demonstrated NMDAR hypofunction and decreased spine density. [PMIDs cited : 31455858, 31780330] Overall haploinsufficiency is favored as the underlying mechanism of variants associated with NDD. Nakashima et al comment that the pathogenesis of missense variants remains unknown and/or that a dominant-negative effect on CRL may be possible. Studies on larger cohorts reporting on individuals with relevant phenotypes due to de novo CUL3 variants (eg. DDD study - PMID: 28135719, Lelieveld et al - PMID: 27479843), are summarized in denovo-db (after filtering for coding variants): http://denovo-db.gs.washington.edu/denovo-db/QueryVariantServlet?searchBy=Gene&target=cul3 Overall, this gene can be considered for inclusion in the ID (amber/green), epilepsy (amber) and/or ASD panels. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2621 | CDC42BPB | Zornitza Stark Mode of inheritance for gene: CDC42BPB was changed from MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2619 | TNRC6B | Konstantinos Varvagiannis reviewed gene: TNRC6B: Rating: GREEN; Mode of pathogenicity: None; Publications: 32152250, 28135719, 25363768, 27479843, 28959963, 25228304; Phenotypes: Global developmental delay, Intellectual disability, Autistic behavior; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2619 | CDC42BPB |
Konstantinos Varvagiannis gene: CDC42BPB was added gene: CDC42BPB was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: CDC42BPB was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: CDC42BPB were set to 32031333 Phenotypes for gene: CDC42BPB were set to Central hypotonia; Global developmental delay; Intellectual disability; Seizures; Autistic behavior; Behavioral abnormality Penetrance for gene: CDC42BPB were set to unknown Review for gene: CDC42BPB was set to GREEN Added comment: Chilton et al (2020 - PMID: 32031333) report on 14 individuals with missense and loss-of-function CDC42BPB variants. Features included hypotonia (8/11), DD (12/13 - the 14th was a fetus), ID (7/13), ASD (8/12), clinical seizures (in 3 - a 4th had abnormal EEG without seizures), behavioral abnormalities. Variable non-specific dysmorphic features were reported in some (sparse hair being the most frequent - 4/8). Additional features were observed in few (=<4) incl. cryptorchidism, ophthalmological issues, constipation, kidney abnormalities, micropenis, etc. All individuals had non-diagnostic prior genetic testing (incl. CMA, FMR1, MECP2, Angelman/Prader-Willi methylation studies, autism gene panel - suggesting relevance to the current panel) or metabolic testing. Variants were identified following clinical exome sequencing with Sanger confirmation. Most occurred as de novo events (11/14) while inheritance was not available for few (3/14). Missense variants did not display (particular) clustering. Almost all variants were absent from gnomAD and were predicted to be deleterious in silico (among others almost all had CADD scores >25). As the authors comment, CDC42BPB encodes myotonic dystrophy-related Cdc42-binding kinase β (MRCKβ) a serine/threonine protein kinase playing a role in regulation of cytoskeletal reorganization and cell migration in nonmuscle cells (through phosporylation of MLC2). Previous studies have demonstrated that it is ubiquitously expressed with prenatal brain expression. The gene appears to be intolerant to pLoF (pLI of 1) as well as to missense variants (Z-score of 3.66). CDC42BPB is a downstream effector of CDC42. Mutations of the latter cause Takenouchi-Kosaki syndrome with DD/ID and some further overlapping features (with CDC42BPB-associated phenotypes). Homozygous Cdc42bpb KO in mouse appears to be nonviable (MGI:2136459). Loss of gek in the eyes of Drosophila results in disrupted growth cone targeting to the lamina (gek is the fly CDC42BPB ortholog). Please consider inclusion with amber / green rating in the ID panel (>=4 relevant individuals / variants) and other panels (e.g. for epilepsy, ASD). Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2609 | ARID1B | Teresa Zhao reviewed gene: ARID1B: Rating: GREEN; Mode of pathogenicity: None; Publications: 25674384, 30349098, 26506440; Phenotypes: Coffin-Siris syndrome 1, MIM 135900; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2585 | NTNG2 | Zornitza Stark edited their review of gene: NTNG2: Added comment: Two more families reported, phenotype described as Rett-like. Both families had same homozygous frameshift mutation (chr9:135073515, c.376dupT, p.(Ser126PhefsTer241).; Changed publications: 31668703, 31692205 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2583 | TAF1 | Zornitza Stark Mode of inheritance for gene: TAF1 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2582 | TAF1 | Zornitza Stark reviewed gene: TAF1: Rating: GREEN; Mode of pathogenicity: None; Publications: 31646703; Phenotypes: Mental retardation, X-linked, syndromic 33, MIM# 300966; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2574 | GALNT2 |
Zornitza Stark gene: GALNT2 was added gene: GALNT2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: GALNT2 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: GALNT2 were set to 32293671 Phenotypes for gene: GALNT2 were set to Congenital disorder of glycosylation Review for gene: GALNT2 was set to GREEN Added comment: Seven individuals from four families reported with bi-allelic LOF variants and global developmental delay, intellectual disability with language deficit, autistic features, behavioural abnormalities, epilepsy, chronic insomnia, white matter changes on brain MRI, dysmorphic features, decreased stature, and decreased high density lipoprotein cholesterol levels. Rodent (mouse and rat) models of GALNT2-CDG recapitulated much of the human phenotype, including poor growth and neurodevelopmental abnormalities. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2556 | TLK2 | Zornitza Stark Mode of inheritance for gene: TLK2 was changed from Unknown to BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2555 | TLK2 | Zornitza Stark reviewed gene: TLK2: Rating: GREEN; Mode of pathogenicity: None; Publications: 29861108, 29942082, 27479843, 23911319, 30559488, 29942082, 31558842; Phenotypes: Intellectual disability, MIM 618050, Neurodevelopmental disease; Mode of inheritance: BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2545 | WIPI2 |
Zornitza Stark gene: WIPI2 was added gene: WIPI2 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: WIPI2 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: WIPI2 were set to 30968111 Phenotypes for gene: WIPI2 were set to Intellectual developmental disorder with short stature and variable skeletal anomalies 618453 Review for gene: WIPI2 was set to RED Added comment: Four homozygous individuals from one consanguineous family with intellectual disability, short stature and variable skeletal anomalies. Functional studies in patient cells showed impaired protein function. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2538 | DYRK1A | Crystle Lee reviewed gene: DYRK1A: Rating: GREEN; Mode of pathogenicity: None; Publications: 25707398; Phenotypes: Mental retardation, autosomal dominant 7 (MIM#614104); Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2532 | CTCF | Crystle Lee reviewed gene: CTCF: Rating: GREEN; Mode of pathogenicity: None; Publications: 23746550, 31239556; Phenotypes: Mental retardation, autosomal dominant 21 (MIM#615502); Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2496 | PQBP1 | Zornitza Stark Mode of inheritance for gene: PQBP1 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2495 | PQBP1 | Zornitza Stark reviewed gene: PQBP1: Rating: GREEN; Mode of pathogenicity: None; Publications: 31840929, 14634649, 20410308; Phenotypes: Renpenning syndrome, MIM#309500; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2493 | DLG3 | Zornitza Stark Mode of inheritance for gene: DLG3 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2492 | DLG3 | Zornitza Stark reviewed gene: DLG3: Rating: GREEN; Mode of pathogenicity: None; Publications: 28777483, 24721225; Phenotypes: Mental retardation, X-linked 90, MIM#300850; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2491 | AGTPBP1 |
Zornitza Stark gene: AGTPBP1 was added gene: AGTPBP1 was added to Intellectual disability syndromic and non-syndromic. Sources: NHS GMS Mode of inheritance for gene: AGTPBP1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: AGTPBP1 were set to 30420557 Phenotypes for gene: AGTPBP1 were set to Early onset cerebellar atrophy, developmental delay, and feeding and respiratory difficulties, severe motor neuronopathy; Neurodegeneration, childhood-onset, with cerebellar atrophy, 618276 Review for gene: AGTPBP1 was set to GREEN Added comment: Thirteen individuals reported, clinical presentation was with developmental delay, though six went on to have a progressive neurological course. Other features include cerebellar atrophy and neuropathy. Sources: NHS GMS |
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| Intellectual disability syndromic and non-syndromic v0.2439 | MRPS34 |
Zornitza Stark gene: MRPS34 was added gene: MRPS34 was added to Intellectual disability syndromic and non-syndromic. Sources: Expert list Mode of inheritance for gene: MRPS34 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: MRPS34 were set to 28777931 Phenotypes for gene: MRPS34 were set to Combined oxidative phosphorylation deficiency 32, MIM# 617664 Review for gene: MRPS34 was set to GREEN gene: MRPS34 was marked as current diagnostic Added comment: Six individuals from 4 unrelated families; clinical presentation is with developmental delay/regression. More variable features include movement disorders, microcephaly, strabismus, nystagmus, optic atrophy. Sources: Expert list |
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| Intellectual disability syndromic and non-syndromic v0.2427 | MAPRE2 |
Zornitza Stark gene: MAPRE2 was added gene: MAPRE2 was added to Intellectual disability syndromic and non-syndromic. Sources: Expert list Mode of inheritance for gene: MAPRE2 was set to BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal Publications for gene: MAPRE2 were set to 26637975 Phenotypes for gene: MAPRE2 were set to Symmetric circumferential skin creases, congenital, 2, MIM# 616734 Review for gene: MAPRE2 was set to GREEN Added comment: ID is part of the phenotype, more severe in those with bi-allelic variants. Sources: Expert list |
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| Intellectual disability syndromic and non-syndromic v0.2420 | TRIO | Zornitza Stark changed review comment from: The nonsense mutations are spread along the TRIO sequence, and affected individuals show variable neurodevelopmental phenotypes. In contrast, missense variants cluster into two mutational hotspots in the TRIO sequence, one in the seventh spectrin repeat and one in the RAC1-activating GEFD1.; to: The nonsense mutations are spread along the TRIO sequence, and affected individuals show variable neurodevelopmental phenotypes. In contrast, missense variants cluster into two mutational hotspots in the TRIO sequence, one in the seventh spectrin repeat and one in the RAC1-activating GEFD1. Individuals with a pathogenic variant in the seventh spectrin repeat have a more severe ID associated with macrocephaly than do most individuals with GEFD1 variants, who display milder ID and microcephaly. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2410 | NKAP |
Zornitza Stark gene: NKAP was added gene: NKAP was added to Intellectual disability syndromic and non-syndromic. Sources: Expert list Mode of inheritance for gene: NKAP was set to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) Publications for gene: NKAP were set to 26358559; 26350204; 31587868 Phenotypes for gene: NKAP were set to Intellectual disability Review for gene: NKAP was set to GREEN gene: NKAP was marked as current diagnostic Added comment: 10 males from 8 unrelated families with missense variants in NKAP. Main features: intellectual disability, hypotonia, tall stature with Marfanoid habitus. Recurrent variant (NM_024528:c.988G>A / p.Arg333Gln) seen in several families from different ethnic backgrounds. Sources: Expert list |
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| Intellectual disability syndromic and non-syndromic v0.2396 | NDUFS6 | Zornitza Stark changed review comment from: Multiple affected families, functional data.; to: Multiple affected families, functional data. Limited clinical information in some reports. In some families, the presentation has been with severe neonatal lactic acidosis, therefore difficult to be sure in what proportion ID is likely to be the presenting or main feature. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2394 | NDUFS2 | Zornitza Stark changed review comment from: Multiple unrelated families. Phenotype in one family was more consistent with regression; in another family severe neonatal lactic acidosis led to death in the first few days of life; and in the third family presentation was with failure to thrive, vomiting, nystagmus, and specifically normal cognition despite delayed motor milestones due to hypotonia. Limited clinical information reported in other papers therefore difficult to know whether ID is likely to be the presenting or main feature of this mitochondrial disorder..; to: Multiple unrelated families. Phenotype in one family was more consistent with regression; in another family severe neonatal lactic acidosis led to death in the first few days of life; and in the third family presentation was with failure to thrive, vomiting, nystagmus, and specifically normal cognition despite delayed motor milestones due to hypotonia. Limited clinical information reported in other papers therefore difficult to know whether ID is likely to be the presenting or main feature of this mitochondrial disorder. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2394 | NDUFS2 | Zornitza Stark changed review comment from: Multiple unrelated families.; to: Multiple unrelated families. Phenotype in one family was more consistent with regression; in another family severe neonatal lactic acidosis led to death in the first few days of life; and in the third family presentation was with failure to thrive, vomiting, nystagmus, and specifically normal cognition despite delayed motor milestones due to hypotonia. Limited clinical information reported in other papers therefore difficult to know whether ID is likely to be the presenting or main feature of this mitochondrial disorder.. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2387 | NDUFB3 | Zornitza Stark changed review comment from: Ten families and functional data.; to: Ten families and functional data. In particular, the 8 families of shared Irish ancestry only had short stature and dysmorphic features, without marked metabolic disturbance. One of the other reported individuals died in infancy, again making it difficult to know whether ID would have been part of the phenotype. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2386 | NDUFAF6 | Zornitza Stark changed review comment from: Multiple unrelated families reported.; to: Multiple unrelated families reported. Presentation in one family was with lactic acidosis in newborn period, and in another with regression in childhood. Limited phenotypic information for others. Unclear if and in what proportion of affected individuals ID is likely to be the main or presenting feature. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2380 | NDUFAF3 | Zornitza Stark changed review comment from: Three unrelated families reported.; to: Three unrelated families reported, severe neonatal presentation with lactic acidosis, seizures, and need for respiratory support. ID is unlikely to be the presenting or main feature. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2379 | NDUFAF2 | Zornitza Stark changed review comment from: At least four unrelated families reported.; to: At least four unrelated families reported, complex neurological presentation with optic atrophy, nystagmus, ataxia in some, others described as ventilator-dependent. ID is unlikely to be the presenting or main feature. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2312 | TMLHE | Zornitza Stark Mode of inheritance for gene: TMLHE was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2310 | TMLHE | Zornitza Stark reviewed gene: TMLHE: Rating: AMBER; Mode of pathogenicity: None; Publications: 21865298; Phenotypes: {Autism, susceptibility to, X-linked 6} 300872; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2303 | TKT | Zornitza Stark reviewed gene: TKT: Rating: AMBER; Mode of pathogenicity: None; Publications: 27259054; Phenotypes: Short stature, developmental delay, and congenital heart defects, OMIM #617044; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2298 | THRB | Zornitza Stark changed review comment from: ID is not part of the phenotype.; to: ID is not generally part of the phenotype but a couple of more severe presentations including ID reported. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2281 | TASP1 |
Zornitza Stark changed review comment from: Four unrelated families reported; two with founder mutation. Protein interacts with KMT2A and KMT2D. Another infant with a de novo missense variant reported in a single infant with multiple congenital abnormalities, insufficient evidence for mono allelic disease at present. Sources: Literature; to: Four unrelated families reported; two with founder mutation. Protein interacts with KMT2A and KMT2D. Another de novo missense variant reported in a single infant with multiple congenital abnormalities, insufficient evidence for mono allelic disease at present. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.2258 | SRPX2 | Zornitza Stark Mode of inheritance for gene: SRPX2 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2256 | SRPX2 | Zornitza Stark reviewed gene: SRPX2: Rating: RED; Mode of pathogenicity: None; Publications: 16497722, 23933820, 23871722; Phenotypes: Rolandic epilepsy, mental retardation, and speech dyspraxia, MIM# 300643; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2220 | PIGA | Zornitza Stark Mode of inheritance for gene: PIGA was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2219 | PIGA | Zornitza Stark reviewed gene: PIGA: Rating: GREEN; Mode of pathogenicity: None; Publications: 24706016, 24259184, 29159939; Phenotypes: Multiple congenital anomalies-hypotonia-seizures syndrome 2, MIM#300868; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2198 | SHROOM4 | Zornitza Stark Mode of inheritance for gene: SHROOM4 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2196 | SHROOM4 | Zornitza Stark reviewed gene: SHROOM4: Rating: AMBER; Mode of pathogenicity: None; Publications: 16249884, 26740508; Phenotypes: Stocco dos Santos X-linked mental retardation syndrome, 300434, Intellectual disability; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2183 | SOX3 | Zornitza Stark Mode of inheritance for gene: SOX3 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2181 | SOX3 | Zornitza Stark reviewed gene: SOX3: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Mental retardation, X-linked, with isolated growth hormone deficiency, MIM# 300123; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2178 | SOX3 | Chern Lim reviewed gene: SOX3: Rating: AMBER; Mode of pathogenicity: Other; Publications: 29175558, 30125608, 12428212, 15800844; Phenotypes: Mental retardation, X-linked, with isolated growth hormone deficiency, MIM#300123, Panhypopituitarism, X-linked, MIM#312000; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2139 | VARS |
Chirag Patel gene: VARS was added gene: VARS was added to Intellectual disability syndromic and non-syndromic. Sources: Expert list Mode of inheritance for gene: VARS was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: VARS were set to PubMed: 30755616, 30755602, 26539891, 29691655, 30275004 Phenotypes for gene: VARS were set to Neurodevelopmental disorder with microcephaly, seizures, and cortical atrophy; OMIM #617802 Review for gene: VARS was set to GREEN Added comment: 14 families with 20 affected individuals - homozygous missense or compound heterozygous mutations in VARS - mutations segregated with the disorder in the families - functional studies in some cases Sources: Expert list |
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| Intellectual disability syndromic and non-syndromic v0.2138 | WDR4 |
Chirag Patel changed review comment from: Galloway-Mowat syndrome 6, OMIM #618347: 1 family with 2 sibs with GMS and compound heterozygous mutations in the WDR4 gene, segregated with the disorder in the family. Functional studies of the variants and studies of patient cells were not performed. 1 family with 1 child with GMS and compound heterozygous mutations in the WDR4 gene, segregated with the disorder in the family. Functional studies of the variants and studies of patient cells were not performed. 1 family with 4 sibs with GMS and homozygous splice site mutation in the WDR4 gene. Functional studies of the variant and studies of patient cells were not performed. Microcephaly, growth deficiency, seizures, and brain malformations; OMIM #618346: 2 unrelated patients with intrauterine growth retardation, postnatal growth deficiency with severe microcephaly, and poor or absent psychomotor development. Testing found the same homozygous missense mutation in the WDR4 gene, which segregated with the disorder in both families. Studies of patient cells and modeling of the corresponding mutation in yeast showed that the mutation caused a significant reduction in m(7)G46 methylation of specific tRNAs species, particularly at higher temperatures. This was associated with a growth defect in yeast, thus offering a potential mechanism for the growth defects observed in patients with the mutation. The findings suggested that abnormal tRNA modification is a major contributor to disease pathogenesis. Sources: Expert list; to: Galloway-Mowat syndrome 6, OMIM #618347: 1 family with 2 sibs with GMS and compound heterozygous mutations in the WDR4 gene, segregated with the disorder in the family. Functional studies of the variants and studies of patient cells were not performed. 1 family with 1 child with GMS and compound heterozygous mutations in the WDR4 gene, segregated with the disorder in the family. Functional studies of the variants and studies of patient cells were not performed. 1 family with 4 sibs with GMS and homozygous splice site mutation in the WDR4 gene. Functional studies of the variant and studies of patient cells were not performed. -------------------------------------------------------------------------------------------------------------------------------------- Microcephaly, growth deficiency, seizures, and brain malformations; OMIM #618346: 2 unrelated patients with intrauterine growth retardation, postnatal growth deficiency with severe microcephaly, and poor or absent psychomotor development. Testing found the same homozygous missense mutation in the WDR4 gene, which segregated with the disorder in both families. Studies of patient cells and modeling of the corresponding mutation in yeast showed that the mutation caused a significant reduction in m(7)G46 methylation of specific tRNAs species, particularly at higher temperatures. This was associated with a growth defect in yeast, thus offering a potential mechanism for the growth defects observed in patients with the mutation. The findings suggested that abnormal tRNA modification is a major contributor to disease pathogenesis. Sources: Expert list |
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| Intellectual disability syndromic and non-syndromic v0.2137 | WDR4 |
Chirag Patel gene: WDR4 was added gene: WDR4 was added to Intellectual disability syndromic and non-syndromic. Sources: Expert list Mode of inheritance for gene: WDR4 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: WDR4 were set to PubMed: 26416026, 30079490, 29597095, 28617965 Phenotypes for gene: WDR4 were set to Galloway-Mowat syndrome 6, OMIM #618347; Microcephaly, growth deficiency, seizures, and brain malformations, OMIM #618346 Review for gene: WDR4 was set to GREEN Added comment: Galloway-Mowat syndrome 6, OMIM #618347: 1 family with 2 sibs with GMS and compound heterozygous mutations in the WDR4 gene, segregated with the disorder in the family. Functional studies of the variants and studies of patient cells were not performed. 1 family with 1 child with GMS and compound heterozygous mutations in the WDR4 gene, segregated with the disorder in the family. Functional studies of the variants and studies of patient cells were not performed. 1 family with 4 sibs with GMS and homozygous splice site mutation in the WDR4 gene. Functional studies of the variant and studies of patient cells were not performed. Microcephaly, growth deficiency, seizures, and brain malformations; OMIM #618346: 2 unrelated patients with intrauterine growth retardation, postnatal growth deficiency with severe microcephaly, and poor or absent psychomotor development. Testing found the same homozygous missense mutation in the WDR4 gene, which segregated with the disorder in both families. Studies of patient cells and modeling of the corresponding mutation in yeast showed that the mutation caused a significant reduction in m(7)G46 methylation of specific tRNAs species, particularly at higher temperatures. This was associated with a growth defect in yeast, thus offering a potential mechanism for the growth defects observed in patients with the mutation. The findings suggested that abnormal tRNA modification is a major contributor to disease pathogenesis. Sources: Expert list |
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| Intellectual disability syndromic and non-syndromic v0.2130 | UFC1 |
Chirag Patel gene: UFC1 was added gene: UFC1 was added to Intellectual disability syndromic and non-syndromic. Sources: Expert list Mode of inheritance for gene: UFC1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: UFC1 were set to PubMed: 29868776 Phenotypes for gene: UFC1 were set to Neurodevelopmental disorder with spasticity and poor growth; OMIM #618076 Review for gene: UFC1 was set to GREEN Added comment: 3 consanguineous Saudi families with neurodevelopmental disorder with spasticity and poor growth with a homozygous missense mutation in the UFC1 gene. An unrelated Swiss boy with same phenotype found to have a different homozygous mutation in the UFC1 gene. Total 8 patients from 4 families. The mutations segregated with the disorder in the families. In vitro functional expression studies showed that both mutations caused impaired thioester binding with UFM1 (610553). Patient cells also showed decreased UFC1 intermediate formation with UFM1. The decrease in function was consistent with a hypomorphic allele, and Nahorski et al. (2018) suggested that complete loss of function would be embryonic lethal. Sources: Expert list |
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| Intellectual disability syndromic and non-syndromic v0.2118 | ZNF81 | Chirag Patel reviewed gene: ZNF81: Rating: AMBER; Mode of pathogenicity: None; Publications: PubMed: 15121780; Phenotypes: mental retardation; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2117 | ZIC1 |
Chirag Patel gene: ZIC1 was added gene: ZIC1 was added to Intellectual disability syndromic and non-syndromic. Sources: Expert list Mode of inheritance for gene: ZIC1 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: ZIC1 were set to PMID: 26340333, 30391508 Phenotypes for gene: ZIC1 were set to Structural brain anomalies with impaired intellectual development and craniosynostosis; OMIM #618736 Review for gene: ZIC1 was set to GREEN Added comment: 5 families with heterozygous mutations located in the final (third) exon of ZIC1 who have a distinct phenotype in which severe craniosynostosis, specifically involving the coronal sutures, and variable learning disability are the most characteristic features. The location of the nonsense mutations predicts escape of mutant ZIC1 transcripts from nonsense-mediated decay, which was confirmed in a cell line from an affected individual. Both nonsense and missense mutations are associated with altered and/or enhanced expression of a target gene, engrailed-2, in a Xenopus embryo assay. Analysis of mouse embryos revealed a localized domain of Zic1 expression at embryonic days 11.5-12.5 in a region overlapping the supraorbital regulatory center, which patterns the coronal suture. 2 sibs with BAIDCS, Vandervore et al. (2018) identified heterozygosity for a frameshift mutation in the ZIC1 gene. Neither parent had evidence of the mutation by whole-exome sequencing, suggesting that gonadal mosaicism for the mutation was present in one of the parents. Expression of the mutated allele was detected in patient fibroblasts by RT-PCR, evidence that the mutant mRNA did not undergo nonsense-mediated decay and probably generates an abnormal protein. Also heterozygous deletions of ZIC1 on chromosome 3q25.1 are associated with Dandy-Walker malformation of the cerebellum. Loss of the orthologous Zic1 gene in the mouse causes cerebellar hypoplasia and vertebral defects. Sources: Expert list |
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| Intellectual disability syndromic and non-syndromic v0.2115 | ZNF148 |
Chirag Patel gene: ZNF148 was added gene: ZNF148 was added to Intellectual disability syndromic and non-syndromic. Sources: Expert list Mode of inheritance for gene: ZNF148 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: ZNF148 were set to PMID: 27964749 Phenotypes for gene: ZNF148 were set to Global developmental delay, absent or hypoplastic corpus callosum, and dysmorphic facies; OMIM #617260 Review for gene: ZNF148 was set to GREEN Added comment: 4 patients with de novo heterozygous nonsense or frameshift mutations in the ZNF148 gene. Patients characterized by underdevelopment of the corpus callosum, mild to moderate developmental delay and ID, variable microcephaly or mild macrocephaly, short stature, feeding problems, facial dysmorphisms, and cardiac and renal malformations. No functional evidence. Sources: Expert list |
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| Intellectual disability syndromic and non-syndromic v0.2066 | KIF4A | Zornitza Stark Mode of inheritance for gene: KIF4A was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2064 | KIF4A | Zornitza Stark reviewed gene: KIF4A: Rating: RED; Mode of pathogenicity: None; Publications: 24812067; Phenotypes: Mental retardation, X-linked 100, MIM# 300923; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2036 | IGBP1 | Zornitza Stark Mode of inheritance for gene: IGBP1 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2035 | IGBP1 | Zornitza Stark reviewed gene: IGBP1: Rating: RED; Mode of pathogenicity: None; Publications: 14556245; Phenotypes: Corpus callosum, agenesis of, with mental retardation, ocular coloboma and micrognathia, MIM# 300472; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2035 | IQSEC2 | Zornitza Stark reviewed gene: IQSEC2: Rating: GREEN; Mode of pathogenicity: None; Publications: 31415821, 20473311, 30842726; Phenotypes: Mental retardation, X-linked 1/78, MIM#309530; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2011 | GSS | Zornitza Stark Phenotypes for gene: GSS were changed from Glutathione synthetase deficiency, MIM# 266130 to Glutathione synthetase deficiency, MIM# 266130 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2010 | GSS | Zornitza Stark Phenotypes for gene: GSS were changed from to Glutathione synthetase deficiency, MIM# 266130 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2008 | GSS | Zornitza Stark reviewed gene: GSS: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Glutathione synthetase deficiency, MIM# 266130; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1933 | FANCG | Zornitza Stark Phenotypes for gene: FANCG were changed from to Fanconi anemia, complementation group G, MIM# 614082 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1931 | FANCB | Zornitza Stark Phenotypes for gene: FANCB were changed from to Fanconi anemia, complementation group B, MIM# 300514 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1930 | FANCG | Zornitza Stark reviewed gene: FANCG: Rating: AMBER; Mode of pathogenicity: None; Publications: ; Phenotypes: Fanconi anemia, complementation group G, MIM# 614082; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1928 | FANCD2 | Zornitza Stark edited their review of gene: FANCD2: Added comment: Clinical presentation is typically with congenital abnormalities/BMF. Only ~10% have ID as part of the phenotype.; Changed rating: AMBER | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1927 | FANCB | Zornitza Stark reviewed gene: FANCB: Rating: AMBER; Mode of pathogenicity: None; Publications: ; Phenotypes: Fanconi anemia, complementation group B, MIM# 300514; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1922 | EMG1 |
Zornitza Stark gene: EMG1 was added gene: EMG1 was added to Intellectual disability syndromic and non-syndromic. Sources: Expert list Mode of inheritance for gene: EMG1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: EMG1 were set to 19463982 Phenotypes for gene: EMG1 were set to Bowen-Conradi syndrome, MIM#211180 Review for gene: EMG1 was set to AMBER Added comment: Founder mutation in Hutterite, D86G. Sources: Expert list |
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| Intellectual disability syndromic and non-syndromic v0.1877 | COQ9 | Zornitza Stark edited their review of gene: COQ9: Added comment: Reviewed again: severe neonatal presentation with metabolic decompensation, including neurological features such as abnormal tone and seizures, but not intellectual disability as such. Downgrade to Amber on this panel.; Changed rating: AMBER | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1876 | COQ2 | Zornitza Stark edited their review of gene: COQ2: Added comment: On further review of the literature, there is poor documentation of intellectual disability as such in the molecularly confirmed cases. Presentation is much more commonly with renal or multi-system disease.; Changed rating: AMBER | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1831 | ACSL4 | Zornitza Stark Mode of inheritance for gene: ACSL4 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1827 | HUWE1 | Zornitza Stark Mode of inheritance for gene: HUWE1 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1826 | HUWE1 | Zornitza Stark reviewed gene: HUWE1: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Mental retardation, X-linked syndromic, Turner type; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1823 | EBP | Zornitza Stark Phenotypes for gene: EBP were changed from to Chondrodysplasia punctata, X-linked dominant MIM#302960; Conradi-Hunermann syndrome; MEND syndrome, MIM#300960 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1822 | EBP | Zornitza Stark Mode of inheritance for gene: EBP was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1821 | EBP | Zornitza Stark reviewed gene: EBP: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Chondrodysplasia punctata, X-linked dominant MIM#302960, Conradi-Hunermann syndrome, MEND syndrome, MIM#300960; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1811 | GNAS | Zornitza Stark Mode of inheritance for gene: GNAS was changed from Unknown to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1805 | ACSL4 | Michelle Torres reviewed gene: ACSL4: Rating: GREEN; Mode of pathogenicity: None; Publications: PMID:12525535; Phenotypes: 1. Mental retardation, X-linked 63 300387 XLD; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1802 | PHF8 | Zornitza Stark Mode of inheritance for gene: PHF8 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1801 | PHF8 | Zornitza Stark reviewed gene: PHF8: Rating: GREEN; Mode of pathogenicity: None; Publications: 17661819, 17594395, 16199551; Phenotypes: Mental retardation syndrome, X-linked, Siderius type, MIM#300263; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1795 | GNAS | Michelle Torres reviewed gene: GNAS: Rating: GREEN; Mode of pathogenicity: None; Publications: PMID: 29072892; Phenotypes: 1. ACTH-independent macronodular adrenal hyperplasia (219080) Somatic Mutations, 2. McCune-Albright syndrome, somatic, mosaic (174800), 3. Osseous heteroplasia, progressive (166350) AD, 4. Pituitary adenoma 3, multiple types, somatic (617686), 5. Pseudohypoparathyroidism Ia (103580) AD, 6. Pseudohypoparathyroidism Ib (603233) AD, 7. Pseudohypoparathyroidism Ic (612462) AD, 8. Pseudopseudohypoparathyroidism (612463) AD; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1795 | GNAS | Michelle Torres reviewed gene: GNAS: Rating: GREEN; Mode of pathogenicity: None; Publications: PMID: 29072892; Phenotypes: 1. ACTH-independent macronodular adrenal hyperplasia (219080) Somatic Mutations, 2. McCune-Albright syndrome, somatic, mosaic (174800), 3. Osseous heteroplasia, progressive (166350) AD, 4. Pituitary adenoma 3, multiple types, somatic (617686), 5. Pseudohypoparathyroidism Ia (103580) AD, 6. Pseudohypoparathyroidism Ib (603233) AD, 7. Pseudohypoparathyroidism Ic (612462) AD, 8. Pseudopseudohypoparathyroidism (612463) AD; Mode of inheritance: None | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1780 | CLCNKA |
Zornitza Stark edited their review of gene: CLCNKA: Added comment: Two families reported, and note digenic inheritance for Bartter postulated. PMID: 15044642 - Schlingmann et al 2004 - in a child with a child with renal salt wasting and deafness, they identified both a homozygous deletion of the CLCNKB gene and a homozygous trp80-to-cys mutation in the CLCNKA gene (W80C). PubMed: 18310267- Nozu et al 2008 - 2-year-old Japanese girl with a severe form of Bartter syndrome with sensorineural deafness. Parents were nonconsanguineous. They found 2 heterozygous mutations in the CLCNKA and CLCNKB genes on the paternal allele, and a 12-kb deletion involving portions of the CLCNKA and CLCNKB genes on the maternal allele. Neither parent was clinically affected. ID has been described for Bartter, but since gene-disease association for Bartter itself is not well established, demote to Red.; Changed rating: RED |
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| Intellectual disability syndromic and non-syndromic v0.1771 | BRIP1 | Zornitza Stark reviewed gene: BRIP1: Rating: AMBER; Mode of pathogenicity: None; Publications: ; Phenotypes: Fanconi anemia, complementation group J, MIM# 609054; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1759 | FBXW11 |
Alison Yeung gene: FBXW11 was added gene: FBXW11 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: FBXW11 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: FBXW11 were set to PMID: 31402090 Phenotypes for gene: FBXW11 were set to Intellectual disability; developmental eye anomalies; digital anomalies Review for gene: FBXW11 was set to GREEN gene: FBXW11 was marked as current diagnostic Added comment: Reported in >3 unrelated individuals Functional studies in Zebrafish Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1748 | ARHGEF6 | Zornitza Stark Mode of inheritance for gene: ARHGEF6 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1746 | ARHGEF6 | Zornitza Stark reviewed gene: ARHGEF6: Rating: RED; Mode of pathogenicity: None; Publications: 11017088; Phenotypes: MENTAL RETARDATION X-LINKED TYPE 46; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1746 | AR | Zornitza Stark Mode of inheritance for gene: AR was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1745 | AR | Zornitza Stark reviewed gene: AR: Rating: RED; Mode of pathogenicity: None; Publications: ; Phenotypes: Spinal and bulbar muscular atrophy of Kennedy, MIM# 313200; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1703 | CLIC2 | Zornitza Stark Mode of inheritance for gene: CLIC2 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1702 | CLIC2 | Zornitza Stark reviewed gene: CLIC2: Rating: RED; Mode of pathogenicity: None; Publications: 22814392, 25927380; Phenotypes: Mental retardation, X-linked, syndromic 32, 300886; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1684 | VPS11 |
Zornitza Stark gene: VPS11 was added gene: VPS11 was added to Intellectual disability syndromic and non-syndromic. Sources: Expert list Mode of inheritance for gene: VPS11 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: VPS11 were set to 27120463; 26307567; 27473128 Phenotypes for gene: VPS11 were set to Leukodystrophy, hypomyelinating, 12, MIM#616683 Review for gene: VPS11 was set to GREEN Added comment: ID, (variable) acquired microcephaly with hypomyelination; seizures in several reported individuals. 13 individuals from 7 Ashkenazi Jewish families, homozygous for a founder mutation (NM_021729.5:c.2536T>G or p.Cys846Gly); a different variant (p.Leu387_Gly395del) reported in a consanguineous family. Sources: Expert list |
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| Intellectual disability syndromic and non-syndromic v0.1669 | NLGN4X | Zornitza Stark Mode of inheritance for gene: NLGN4X was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1667 | NLGN4X | Zornitza Stark reviewed gene: NLGN4X: Rating: RED; Mode of pathogenicity: None; Publications: 12669065, 18231125, 10071191, 29428674; Phenotypes: Mental retardation, X-linked, MIM# 300495; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1619 | KCNN3 |
Alison Yeung gene: KCNN3 was added gene: KCNN3 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: KCNN3 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: KCNN3 were set to PMID: 31155282 Phenotypes for gene: KCNN3 were set to Zimmermann-Laband syndrome 3; OMIM# 618658 Review for gene: KCNN3 was set to GREEN gene: KCNN3 was marked as current diagnostic Added comment: Reported in three unrelated individuals Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1614 | IQSEC1 |
Zornitza Stark gene: IQSEC1 was added gene: IQSEC1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: IQSEC1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: IQSEC1 were set to 31607425 Phenotypes for gene: IQSEC1 were set to Intellectual developmental disorder with short stature and behavioral abnormalities, MIM# 618687 Review for gene: IQSEC1 was set to GREEN Added comment: Five individuals from two unrelated families reported, animal model data. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1612 | POLA1 |
Alison Yeung gene: POLA1 was added gene: POLA1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: POLA1 was set to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) Publications for gene: POLA1 were set to PMID: 31006512 Phenotypes for gene: POLA1 were set to Van Esch-O'Driscoll syndrome OMIM# 301030 Review for gene: POLA1 was set to GREEN gene: POLA1 was marked as current diagnostic Added comment: Five unrelated families reported Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1609 | GPC4 |
Alison Yeung gene: GPC4 was added gene: GPC4 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: GPC4 was set to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) Publications for gene: GPC4 were set to PMID: 30982611 Phenotypes for gene: GPC4 were set to Keipert syndrome OMIM# 301026 Review for gene: GPC4 was set to GREEN gene: GPC4 was marked as current diagnostic Added comment: >3 unrelated individuals reported, functional studies in mice Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1605 | MAPK8IP3 |
Alison Yeung gene: MAPK8IP3 was added gene: MAPK8IP3 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: MAPK8IP3 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: MAPK8IP3 were set to 30612693 Phenotypes for gene: MAPK8IP3 were set to Neurodevelopmental disorder with or without variable brain abnormalities OMIM# 605431 Review for gene: MAPK8IP3 was set to GREEN gene: MAPK8IP3 was marked as current diagnostic Added comment: >3 reported individuals and functional evidence in Caenorhabditis elegans Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1533 | STAG2 |
Dean Phelan gene: STAG2 was added gene: STAG2 was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Expert list Mode of inheritance for gene: STAG2 was set to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) Publications for gene: STAG2 were set to 30765867; 28296084; 30447054; 29263825; 30158690 Added comment: 12 unrelated families reported both males and females affected (OMIM). Sources: Expert list |
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| Intellectual disability syndromic and non-syndromic v0.1514 | DNMT3A | Zornitza Stark Phenotypes for gene: DNMT3A were changed from Gatton-Brown-Rahman syndrome, MIM#615879; primordial dwarfism with intellectual disability and microcephaly to Tatton-Brown-Rahman syndrome, MIM#615879; primordial dwarfism with intellectual disability and microcephaly | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1510 | DNMT3A | Zornitza Stark reviewed gene: DNMT3A: Rating: GREEN; Mode of pathogenicity: Other; Publications: 30478443, 24614070; Phenotypes: TATTON-BROWN-RAHMAN SYNDROME, OMIM# 615879, primordial dwarfism with intellectual disability and microcephaly; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1504 | H3F3B | Zornitza Stark commented on gene: H3F3B: Elizabeth J Bhoj, H3F3A/B Consortium, Hakon H. Hakonarson.: Mutations In H3f3a And H3f3b Encoding Histone 3.3: Report Of 26 Patients With Neurodevelopmental And Congenital Manifestations. American Society of Human Genetics, Orlando, FL October 2017 Notes: Platform Presentation. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1492 | CXorf56 |
Zornitza Stark gene: CXorf56 was added gene: CXorf56 was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Expert list Mode of inheritance for gene: CXorf56 was set to X-LINKED: hemizygous mutation in males, biallelic mutations in females Publications for gene: CXorf56 were set to 29374277 Phenotypes for gene: CXorf56 were set to Mental retardation, X-linked 107, MIM# 301013 Review for gene: CXorf56 was set to RED Added comment: Single multigenerational family reported. Sources: Expert list |
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| Intellectual disability syndromic and non-syndromic v0.1490 | USP27X |
Zornitza Stark gene: USP27X was added gene: USP27X was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Expert list Mode of inheritance for gene: USP27X was set to X-LINKED: hemizygous mutation in males, biallelic mutations in females Publications for gene: USP27X were set to 25644381 Phenotypes for gene: USP27X were set to Mental retardation, X-linked 105, MIM#300984 Review for gene: USP27X was set to AMBER Added comment: Four individuals from two unrelated families reported. Sources: Expert list |
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| Intellectual disability syndromic and non-syndromic v0.1488 | KLHL15 |
Zornitza Stark gene: KLHL15 was added gene: KLHL15 was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: KLHL15 was set to X-LINKED: hemizygous mutation in males, biallelic mutations in females Publications for gene: KLHL15 were set to 25644381; 24817631 Phenotypes for gene: KLHL15 were set to Mental retardation, X-linked 103, MIM#300982 Review for gene: KLHL15 was set to AMBER Added comment: Two families described: variants maternally inherited in both, one deletion, the other truncating. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1484 | RALA |
Zornitza Stark gene: RALA was added gene: RALA was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: RALA was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: RALA were set to 30500825 Phenotypes for gene: RALA were set to Intellectual disability; short stature; dysmorphism Review for gene: RALA was set to GREEN Added comment: Ten individuals with de novo variants in this gene, six of these at two codons only: Val25 and Lys128. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1450 | SHANK1 | Sebastian Lunke reviewed gene: SHANK1: Rating: RED; Mode of pathogenicity: None; Publications: 22503632, 25188300; Phenotypes: ; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1431 | CLCN4 | Zornitza Stark Mode of inheritance for gene: CLCN4 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1429 | CLCN4 | Elizabeth Palmer reviewed gene: CLCN4: Rating: GREEN; Mode of pathogenicity: None; Publications: (PMID: 27550844); Phenotypes: intellectual disability, epilepsy, autistic features, mood disorders, cerebral white matter changes, progressive appendicular spasticity; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1426 | TASP1 |
Zornitza Stark gene: TASP1 was added gene: TASP1 was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: TASP1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: TASP1 were set to 31209944; 31350873 Phenotypes for gene: TASP1 were set to Developmental delay; microcephaly; dysmorphic features; congenital abnormalities Review for gene: TASP1 was set to GREEN Added comment: Four unrelated families reported; two with founder mutation. Protein interacts with KMT2A and KMT2D. Another infant with a de novo missense variant reported in a single infant with multiple congenital abnormalities, insufficient evidence for mono allelic disease at present. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1394 | PISD | Zornitza Stark Phenotypes for gene: PISD were changed from no OMIM number yet. to Intellectual disability; cataracts; retinal degeneration; microcephaly; deafness; short stature; white matter abnormalities; no OMIM number yet. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1385 | KDM3B | Zornitza Stark Phenotypes for gene: KDM3B were changed from no OMIM number yet to Intellectual disability; dysmorphic features; short stature; no OMIM number yet | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1368 | DDX6 |
Zornitza Stark gene: DDX6 was added gene: DDX6 was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: DDX6 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: DDX6 were set to 31422817, Phenotypes for gene: DDX6 were set to Intellectual developmental disorder with impaired language and dysmorphic facies, MIM#618653 Review for gene: DDX6 was set to GREEN Added comment: Five unrelated individuals reported with 5 different de novo heterozygous missense mutations in exon 11 of the DDX6 gene. All variants occurred at conserved residues in either the QxxR or V motifs within the second RecA-2 domain of the helicase core; this region is involved in RNA and/or ATP binding, suggesting functional consequences. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1361 | FBXL3 |
Chirag Patel gene: FBXL3 was added gene: FBXL3 was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: FBXL3 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: FBXL3 were set to PubMed: 30481285 Phenotypes for gene: FBXL3 were set to Intellectual developmental disorder with short stature, facial anomalies, and speech defects; OMIM #606220 Review for gene: FBXL3 was set to AMBER Added comment: 3 unrelated families with 8 affected individuals with ID, DD, short stature and mild facial dysmorphism, and with homozygous mutations in FBXL3. Segregated with the disorder in all 3 families. Functional studies of the variants and studies of patient cells were not performed. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1358 | FRY |
Chirag Patel gene: FRY was added gene: FRY was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: FRY was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: FRY were set to PMID: 31487712; 27457812; 21937992 Phenotypes for gene: FRY were set to no OMIM number yet Review for gene: FRY was set to AMBER Added comment: 1 patient with ID/DD and a novel homozygous deletion involving FRY gene identified by genomic SNP microarray. No functional evidence. 2 consanguineous families with 6 affected individuals with ID, and homozygous mutations of FRY. No functional evidence. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1355 | GABRA5 |
Chirag Patel gene: GABRA5 was added gene: GABRA5 was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: GABRA5 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: GABRA5 were set to PMID: 31056671; 29961870 Phenotypes for gene: GABRA5 were set to Epileptic encephalopathy, early infantile, 79; OMIM #618559 Review for gene: GABRA5 was set to GREEN Added comment: 3 unrelated patients with de novo heterozygous missense mutations in GABRA5 gene. In vitro functional expression studies in HEK293 cells showed that the mutant subunit was expressed at the surface and incorporated into the channel, but the mutant channel was 10 times more sensitive to GABA compared to wildtype. This increased sensitization resulted in increased receptor desensitization to GABA, with a reduced maximal GABA-evoked current and impaired capacity to pass GABAergic chloride current. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1350 | GRIA2 |
Chirag Patel gene: GRIA2 was added gene: GRIA2 was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: GRIA2 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: GRIA2 were set to PMID: 31300657 Phenotypes for gene: GRIA2 were set to no OMIM number yet Review for gene: GRIA2 was set to GREEN Added comment: 28 unrelated patients with ID, ASD, Rett-like features, seizures/EE, and de novo heterozygous GRIA2 mutations. In functional expression studies, mutations led to a decrease in agonist-evoked current mediated by mutant subunits compared to wild-type channels. When GluA2 subunits are co-expressed with GluA1, most GRIA2 mutations cause a decreased current amplitude and some also affect voltage rectification. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1349 | GTF2E2 |
Chirag Patel changed review comment from: 2 unrelated non-photosensitive TTD families with homozygous missense mutation in GTF2E2. Functional evidence showing mutant TFIIEβ strongly reduces the total amount of the entire TFIIE complex, with a remarkable temperature-sensitive transcription defect, which strikingly correlates with the phenotypic aggravation of key clinical symptoms after episodes of high fever. Induced pluripotent stem cell reprogramming of patient fibroblasts followed by in vitro erythroid differentiation, showed a clear hematopoietic defect during late-stage differentiation associated with hemoglobin subunit imbalance. Sources: Literature; to: 2 unrelated non-photosensitive TTD families (3 affected) with homozygous missense mutation in GTF2E2. Functional evidence showing mutant TFIIEβ strongly reduces the total amount of the entire TFIIE complex, with a remarkable temperature-sensitive transcription defect, which strikingly correlates with the phenotypic aggravation of key clinical symptoms after episodes of high fever. Induced pluripotent stem cell reprogramming of patient fibroblasts followed by in vitro erythroid differentiation, showed a clear hematopoietic defect during late-stage differentiation associated with hemoglobin subunit imbalance. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1348 | GTF2E2 |
Chirag Patel gene: GTF2E2 was added gene: GTF2E2 was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: GTF2E2 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: GTF2E2 were set to PMID: 28973399 Phenotypes for gene: GTF2E2 were set to Trichothiodystrophy 6, nonphotosensitive; OMIM #616943 Review for gene: GTF2E2 was set to AMBER Added comment: 2 unrelated non-photosensitive TTD families with homozygous missense mutation in GTF2E2. Functional evidence showing mutant TFIIEβ strongly reduces the total amount of the entire TFIIE complex, with a remarkable temperature-sensitive transcription defect, which strikingly correlates with the phenotypic aggravation of key clinical symptoms after episodes of high fever. Induced pluripotent stem cell reprogramming of patient fibroblasts followed by in vitro erythroid differentiation, showed a clear hematopoietic defect during late-stage differentiation associated with hemoglobin subunit imbalance. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1346 | KDM3B |
Chirag Patel gene: KDM3B was added gene: KDM3B was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: KDM3B was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: KDM3B were set to PMID: 30929739 Phenotypes for gene: KDM3B were set to no OMIM number yet Review for gene: KDM3B was set to GREEN Added comment: 14 unrelated individuals and 3 affected parents with varying degrees of ID, DD, short stature, dysmorphism, and de novo or inherited pathogenic variants in KDM3B. No functional studies. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1344 | LMAN2L |
Chirag Patel gene: LMAN2L was added gene: LMAN2L was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: LMAN2L was set to BOTH monoallelic and biallelic, autosomal or pseudoautosomal Publications for gene: LMAN2L were set to PMID: 31020005; 26566883 Phenotypes for gene: LMAN2L were set to ?Mental retardation, autosomal recessive, 52; OMIM #616887 Review for gene: LMAN2L was set to AMBER Added comment: 1 consanguineous family with 7 individuals with ID and epilepsy, with homozygous LMAN2L missense mutation. Segregated with disease in family, and unaffected family members were heterozygous variant carriers. No functional studies. 1 non-consanguineous family with 4 affected with heterozygous frameshift LMAN2L mutation. Segregates in family. Mutation eliminates LMAN2L's endoplasmic reticulum retention signal and mislocalizes the protein from that compartment to the plasma membrane. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1338 | MAST1 |
Chirag Patel gene: MAST1 was added gene: MAST1 was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: MAST1 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: MAST1 were set to PMID: 31721002; 30449657 Phenotypes for gene: MAST1 were set to Mega-corpus-callosum syndrome with cerebellar hypoplasia and cortical malformations; OMIM #618273 Review for gene: MAST1 was set to GREEN Added comment: 6 unrelated patients with mega-corpus-callosum syndrome with cerebellar hypoplasia and cortical malformations (MCCCHCM) with de novo heterozygous mutations in MAST1 gene. In vitro functional studies showed that 1 of the variants (lys276del) increased MAST1 binding to microtubules compared to controls. Mutant mice heterozygous for a Mast1 leu278del allele showed a thicker corpus callosum compared to wildtype, and an overall reduction in cortical volume and thickness and decreased cerebellar volume and number of granule and Purkinje cells due to increased apoptosis compared to controls. 1 Emirati patient with ID, microcephaly, and dysmorphic features, with missense variant in MAST1. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1335 | NCAPD2 |
Chirag Patel gene: NCAPD2 was added gene: NCAPD2 was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: NCAPD2 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: NCAPD2 were set to PMID: 31056748; 27737959; 28097321 Phenotypes for gene: NCAPD2 were set to ?Microcephaly 21, primary, autosomal recessive; OMIM #617983 Review for gene: NCAPD2 was set to AMBER Added comment: 1 family with 2 sibs with microcephaly and ID, and homozygous NCAPD2 mutation, which segregated with disease. No functional evidence. 1 family with 1 affected and homozygous NCAPD2 mutation, which segregated with disease. Patient fibroblasts showed impaired chromosome segregation and abnormal recovery from mitotic condensation compared to controls. 1 family with 2 sibs with microcephaly, growth retardation, and ID, and homozygous NCAPD2 mutation, which segregated with disease. Functional studies of the variants and studies of patient cells were not performed. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1328 | PAK1 |
Chirag Patel gene: PAK1 was added gene: PAK1 was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: PAK1 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: PAK1 were set to PMID: 31504246; 30290153 Phenotypes for gene: PAK1 were set to Intellectual developmental disorder with macrocephaly, seizures, and speech delay; OMIM #618158 Review for gene: PAK1 was set to GREEN Added comment: 2 unrelated individuals with de novo PAK1 mutations, with developmental delay, secondary macrocephaly, seizures, and ataxic gait. Enhanced phosphorylation of the PAK1 targets JNK and AKT shown in fibroblasts of one subject and of c-JUN in those of both subjects compared with control subjects. In fibroblasts of the 2 affected individuals, they observed a trend toward enhanced PAK1 kinase activity. By using co-immunoprecipitation and size-exclusion chromatography, they observed a significantly reduced dimerization for both PAK1 mutants compared with wild-type PAK1. 4 unrelated individuals with intellectual disability, macrocephaly and seizures, with de novo heterozygous missense variants in PAK1. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1324 | PIBF1 |
Chirag Patel gene: PIBF1 was added gene: PIBF1 was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: PIBF1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: PIBF1 were set to PubMed: 26167768; 30858804; 29695797 Phenotypes for gene: PIBF1 were set to Joubert syndrome 33; OMIM #617767 Review for gene: PIBF1 was set to GREEN Added comment: 1 family of Schmiedeleut Hutterite descent with 2 affected brothers with Joubert syndrome had homozygous missense mutation in PIBF1 gene. Parents were heterozygous. 2 other Hutterite families with 3 affected children and same homozygous missense mutation in PIBF1 gene, suggesting a founder effect. 2 other unrelated individuals with compound heterozygous mutations in PIBF1 gene. 1 unrelated individual with compound heterozygous variants in PIBF1 gene, and functional evidence in the frog Xenopus. 1 unrelated individual with another homozygous missense mutation in PIBF1 gene, but no and functional evidence. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1322 | PIGB |
Chirag Patel gene: PIGB was added gene: PIGB was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: PIGB was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: PIGB were set to PubMed: 31256876 Phenotypes for gene: PIGB were set to Epileptic encephalopathy, early infantile, 80; OMIM #618580 Review for gene: PIGB was set to GREEN Added comment: 10 unrelated families with biallelic mutations in PIGB, with global DD and/or ID, and seizures. Two had polymicrogyria, 4 had a peripheral neuropathy, and 2 had a clinical diagnosis of DOORS syndrome. Patient lymphocytes and fibroblasts showed variably decreased levels of cell surface GPI-anchored proteins, including CD16 and CD59. In vitro functional expression studies performed with some of the mutations in PIGB-null CHO cells showed that the mutant proteins were unable to fully restore expression of GPI-anchored surface proteins, consistent with a loss of function, although the mutations had variable effects. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1320 | PIGU |
Chirag Patel gene: PIGU was added gene: PIGU was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: PIGU was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: PIGU were set to PMID: 31353022 Phenotypes for gene: PIGU were set to Glycosylphosphatidylinositol biosynthesis defect 21; OMIM #618590 Review for gene: PIGU was set to GREEN Added comment: 5 patients from 3 unrelated families, with homozygous missense mutations in the PIGU gene. All individuals presented with global DD, severe-to-profound ID, muscular hypotonia, seizures, brain anomalies, scoliosis, and mild facial dysmorphism. Flow cytometric analysis of patient granulocytes showed a characteristic pattern, with reduced cell surface expression of CD16 and CD24. In addition, patient B cells showed increased expression of free GPI anchors determined by a specific antibody, T5. The findings suggested that PIGU mutations reduce the function of the GPI transamidase complex, leading to accumulation of free GPI anchors on the cell surface. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1317 | PISD |
Chirag Patel changed review comment from: 4 individuals in 2 unrelated but consanguineous families from Portugal and Brazil affected by early-onset retinal degeneration, sensorineural hearing loss, microcephaly, intellectual disability, and skeletal dysplasia with scoliosis and short stature (Liberfarb syndrome). Affected individuals shared a homozygous 10-bp deletion immediately upstream of the last exon of the PISD gene. In HEK293T cells, this variant led to aberrant splicing of PISD transcripts. Sources: Literature; to: 4 individuals in 2 unrelated but consanguineous families from Portugal and Brazil affected by early-onset retinal degeneration, sensorineural hearing loss, microcephaly, intellectual disability, and skeletal dysplasia with scoliosis and short stature (Liberfarb syndrome). Affected individuals shared a homozygous 10-bp deletion immediately upstream of the last exon of the PISD gene. In HEK293T cells, this variant led to aberrant splicing of PISD transcripts. 1 family with 2 sisters with congenital cataracts, short stature, and white matter changes identified compound heterozygous variants in the PISD gene. Decreased conversion of phosphatidylserine to PE in patient fibroblasts is consistent with impaired phosphatidylserine decarboxylase (PISD) enzyme activity. |
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| Intellectual disability syndromic and non-syndromic v0.1317 | PISD |
Chirag Patel gene: PISD was added gene: PISD was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: PISD was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: PISD were set to PMID: 31263216 Phenotypes for gene: PISD were set to no OMIM number yet. Review for gene: PISD was set to AMBER Added comment: 4 individuals in 2 unrelated but consanguineous families from Portugal and Brazil affected by early-onset retinal degeneration, sensorineural hearing loss, microcephaly, intellectual disability, and skeletal dysplasia with scoliosis and short stature (Liberfarb syndrome). Affected individuals shared a homozygous 10-bp deletion immediately upstream of the last exon of the PISD gene. In HEK293T cells, this variant led to aberrant splicing of PISD transcripts. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1313 | PPP2CA |
Chirag Patel gene: PPP2CA was added gene: PPP2CA was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: PPP2CA was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: PPP2CA were set to PMID: 30595372 Phenotypes for gene: PPP2CA were set to Neurodevelopmental disorder and language delay with or without structural brain abnormalities; OMIM #618354 Review for gene: PPP2CA was set to GREEN Added comment: 15 unrelated patients with a neurodevelopmental disorder with de novo heterozygous PPP2CA mutations, and 1 with partial deletion of PPP2CA. Functional studies showed complete PP2A dysfunction in 4 individuals with seemingly milder ID, hinting at haploinsufficiency. Ten other individuals showed mutation-specific biochemical distortions, including poor expression, altered binding to the A subunit and specific B-type subunits, and impaired phosphatase activity and C-terminal methylation. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1311 | PUS7 |
Chirag Patel gene: PUS7 was added gene: PUS7 was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: PUS7 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: PUS7 were set to PMID: 30526862; 30778726; 31583274 Phenotypes for gene: PUS7 were set to Intellectual developmental disorder with abnormal behavior, microcephaly, and short stature; OMIM #618342 Review for gene: PUS7 was set to GREEN Added comment: 11 patients from 6 families with ID, speech delay, short stature, microcephaly, and aggressive behavior, with homozygous PUS7 mutations, which segregated with disease. One study showed disease-related variants lead to abolishment of PUS7 activity on both tRNA and mRNA substrates. pus7 knockout in Drosophila melanogaster results in a number of behavioral defects, including increased activity, disorientation, and aggressiveness supporting that neurological defects are caused by PUS7 variants. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1309 | RNF113A |
Chirag Patel gene: RNF113A was added gene: RNF113A was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: RNF113A was set to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) Publications for gene: RNF113A were set to PMID: 25612912; 31793730 Phenotypes for gene: RNF113A were set to ?Trichothiodystrophy 5, nonphotosensitive; OMIM #300953 Review for gene: RNF113A was set to AMBER Added comment: 1 family of 2 male cousins with IUGR, progressive microcephaly, profound ID, genital anomalies, and severe linear growth failure, and nonsense Q301X mutation in RNF113A gene. Segregated with disease in the family. The mutation markedly reduced RNF113A protein expression in extracts from lymphoblastoid cell lines derived from the affected individuals. 2 fetuses affected with abnormalities similar to previous report, with the same nonsense Q301X mutation in RNF113A gene (can not access paper to see if from same family or functional evidence). Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1307 | SCAMP5 |
Chirag Patel gene: SCAMP5 was added gene: SCAMP5 was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: SCAMP5 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: SCAMP5 were set to PMID: 31439720 Phenotypes for gene: SCAMP5 were set to no OMIM number yet Review for gene: SCAMP5 was set to AMBER Added comment: 2 unrelated individuals with ASD, ID and seizures, with the same heterozygous de novo variant in SCAMP5 (p.Gly302Trp). Western blot analysis of proteins overexpressed in the Drosophila fat body showed strongly reduced levels of the SCAMP p.Gly302Trp protein compared with the wild-type protein, indicating that the mutant either reduced expression or increased turnover of the protein. The expression of the fly homologue of the human SCAMP5 p.Gly180Trp mutation caused similar eye and neuronal phenotypes as the expression of SCAMP RNAi, suggesting a dominant-negative effect. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1305 | SCAPER |
Chirag Patel gene: SCAPER was added gene: SCAPER was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: SCAPER was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: SCAPER were set to PMID: 28794130; 31069901; 31192531; 30723319 Phenotypes for gene: SCAPER were set to Intellectual developmental disorder and retinitis pigmentosa; OMIM #618195 Review for gene: SCAPER was set to GREEN Added comment: 28 patients from 14 unrelated families with ID and retinitis pigmentosa (some with BBS phenotype), and homozygous or compound heterozygous mutations in SCAPER gene. No functional evidence of specific variants. Analyses of SCAPER expression in human and mouse brain revealed an upregulation of SCAPER expression during cortical development and a higher expression of SCAPER in neurons compared to neural progenitors. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1299 | BCORL1 |
Zornitza Stark gene: BCORL1 was added gene: BCORL1 was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: BCORL1 was set to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) Publications for gene: BCORL1 were set to 24123876; 30941876 Phenotypes for gene: BCORL1 were set to Shukla-Vernon syndrome, MIM#301029 Review for gene: BCORL1 was set to GREEN Added comment: Four unrelated families reported altogether; some mothers mildly affected. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1296 | SMARCD1 |
Chirag Patel gene: SMARCD1 was added gene: SMARCD1 was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: SMARCD1 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: SMARCD1 were set to PMID: 30879640 Phenotypes for gene: SMARCD1 were set to no OMIM number yet Review for gene: SMARCD1 was set to GREEN Added comment: 5 individuals with heterozygous SMARCD1 variants (4 de novo, 1 unk), and developmental delay, intellectual disability, hypotonia, feeding difficulties, dysmorphisms, and small hands and feet. No functional evidence of some variants was not conclusive with immunoblot or co-immunoprecipitation studies. Targeted knockdown of Drosophila ortholog Bap60 in the mushroom body of adult flies causes defects in long-term memory. Mushroom-body-specific transcriptome analysis revealed that Bap60 is required for context-dependent expression of genes involved in neuron function and development in juvenile flies when synaptic connections are actively being formed in response to experience. T Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1293 | SNRPE |
Chirag Patel gene: SNRPE was added gene: SNRPE was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: SNRPE was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Phenotypes for gene: SNRPE were set to Hypotrichosis 11; OMIM #615059 Review for gene: SNRPE was set to AMBER Added comment: 1 patient with de novo heterozygous missense SNRPE mutation, with non-syndromic primary microcephaly and intellectual disability. SNRPE encodes SmE and they showed that the microcephaly-linked SmE variant is unable to interact with the SMN complex and as a consequence fails to assemble into U snRNPs. This results in widespread mRNA splicing alterations in fibroblast cells derived from this patient. Similar alterations were observed in HEK293 cells upon SmE depletion that could be rescued by the expression of wild type but not mutant SmE. Depletion of SmE in zebrafish causes aberrant mRNA splicing alterations and reduced brain size, reminiscent of the patient microcephaly phenotype. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1291 | SOX4 |
Chirag Patel gene: SOX4 was added gene: SOX4 was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: SOX4 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: SOX4 were set to PMID: 30661772 Phenotypes for gene: SOX4 were set to Coffin-Siris syndrome 10; OMIM #618506 Review for gene: SOX4 was set to GREEN Added comment: 4 patients with syndromic DD/ID and de novo mutations in SOX4 gene. Functional assays demonstrated that the SOX4 proteins carrying these variants were unable to bind DNA in vitro and transactivate SOX reporter genes in cultured cells. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1289 | SVBP |
Chirag Patel gene: SVBP was added gene: SVBP was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: SVBP was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: SVBP were set to PMID: 31363758; 30607023 Phenotypes for gene: SVBP were set to Neurodevelopmental disorder with ataxia, hypotonia, and microcephaly; OMIM #618569 Review for gene: SVBP was set to GREEN Added comment: 5 unrelated families with homozygous mutations in SVBP. The mutations segregated with the disorder in all families. In vitro functional cellular expression studies showed that protein levels of the SVBP mutants were barely detectable, suggesting instability, and that the mutant proteins had lost VASH/SVBP catalytic detyrosination activity toward tubulin. Knockdown of about 50% Svbp expression using shRNA in rat hippocampal neurons impaired the formation of excitatory synapses compared to controls. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1287 | TANC2 |
Chirag Patel gene: TANC2 was added gene: TANC2 was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: TANC2 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: TANC2 were set to PMID: 31616000 Phenotypes for gene: TANC2 were set to no OMIM number yet Review for gene: TANC2 was set to GREEN Added comment: 19 families with potentially disruptive heterozygous TANC2 variants, including 16 likely gene-disrupting mutations and three intragenic microdeletions. Patients presented with autism, intellectual disability, delayed language and motor development, epilepsy, facial dysmorphism, with complex psychiatric dysfunction or behavioral problems in adult probands or carrier parents. No functional evidence of specific variants, but they show TANC2 is expressed broadly in the human developing brain, especially in excitatory neurons and glial cells, and shows a more restricted pattern in Drosophila glial cells where its disruption affects behavioral outcomes. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1283 | TARS |
Chirag Patel gene: TARS was added gene: TARS was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: TARS was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: TARS were set to PMID: 31374204 Phenotypes for gene: TARS were set to Trichothiodystrophy 7, nonphotosensitive; OMIM #618546 Review for gene: TARS was set to AMBER Added comment: Clinical features of trichothiodystrophy (TTD) include ichthyosis, intellectual disability, decreased fertility, short stature. 2 unrelated patients with non-photosensitive-TTD, in whom limited clinical information was available (one with DD): one compound heterozygous TARS variants, second homozygous for TARS variant. They showed that the variants had a profound effect on TARS protein stability and enzymatic function. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1277 | VAMP2 |
Chirag Patel gene: VAMP2 was added gene: VAMP2 was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: VAMP2 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: VAMP2 were set to PMID: 30929742 Phenotypes for gene: VAMP2 were set to no OMIM number yet Review for gene: VAMP2 was set to GREEN Added comment: 5 unrelated patients with heterozygous de novo mutations in VAMP2, presenting with a neurodevelopmental disorder characterized by axial hypotonia, intellectual disability, and autistic features. Affected individuals carrying de novo non-synonymous variants involving the C-terminal region presented a more severe phenotype with additional neurological features, including central visual impairment, hyperkinetic movement disorder, and epilepsy or electroencephalography abnormalities. Reconstituted fusion involving a lipid-mixing assay indicated impairment in vesicle fusion as one of the possible associated disease mechanisms. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1275 | ZMIZ1 |
Chirag Patel gene: ZMIZ1 was added gene: ZMIZ1 was added to Intellectual disability, syndromic and non-syndromic_GHQ_VCGS. Sources: Literature Mode of inheritance for gene: ZMIZ1 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: ZMIZ1 were set to PubMed: 30639322 Phenotypes for gene: ZMIZ1 were set to Neurodevelopmental disorder with dysmorphic facies and distal skeletal anomalies; OMIM #618659 Review for gene: ZMIZ1 was set to GREEN Added comment: 28 families with spectrum of neurodevelopmental features (including ID, ASD, and ADHD) due to de novo ZNF292 variants (1 family inherited). No functional evidence of specific variants, but ZNF292 is highly expressed in the developing human brain. 14 unrelated patients with neurodevelopmental disorder with dysmorphic facies and distal skeletal anomalies, and de novo heterozygous mutations in the ZMIZ1 gene. Transfection of 3 variants (T300M, c.3112dupA, and K91R) into HEK293T cells resulted in decreased induction of luciferase activity compared to wildtype (although the change for K91R was not statistically significant), suggesting impaired coactivation activity of the mutant proteins. Electroporation of these 3 mutants into progenitor cells in the ventricular zone of embryonic mice cortices resulted in defective neuronal migration to the cortex, as well as morphologic abnormalities of the neurons manifest as rounded cells with aberrantly oriented processes. These findings suggested that the ZMIZ1 mutations disrupted proper neuronal polarization and neuronal migration in the developing cortex. Functional studies of the other variants and additional studies of patient cells were not performed. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.1264 | STAT5B | Zornitza Stark Marked gene: STAT5B as ready | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1264 | STAT5B | Zornitza Stark Gene: stat5b has been classified as Red List (Low Evidence). | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1235 | SLC9A7 |
Chirag Patel Source Genetic Health Queensland was removed from SLC9A7. Source Expert list was added to SLC9A7. Mode of inheritance for gene SLC9A7 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females Phenotypes for gene: SLC9A7 were changed from to Intellectual developmental disorder, X-linked 108; OMIM #301024 Publications for gene SLC9A7 were changed from PubMed: 30335141 to PubMed: 30335141 |
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| Intellectual disability syndromic and non-syndromic v0.1234 | SLC9A7 | Chirag Patel reviewed gene: SLC9A7: Rating: AMBER; Mode of pathogenicity: None; Publications: PMID: 30335141; Phenotypes: Intellectual developmental disorder, X-linked 108, OMIM #301024; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1185 | STAT5B | Chirag Patel Classified gene: STAT5B as Red List (low evidence) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1185 | STAT5B | Chirag Patel Gene: stat5b has been classified as Red List (Low Evidence). | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1184 | STAT5B |
Chirag Patel Source Genetic Health Queensland was removed from STAT5B. Source Expert list was added to STAT5B. Mode of inheritance for gene STAT5B was changed from Unknown to BIALLELIC, autosomal or pseudoautosomal Phenotypes for gene: STAT5B were changed from to Growth hormone insensitivity with immunodeficiency; OMIM #245590 |
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| Intellectual disability syndromic and non-syndromic v0.1183 | STAT5B | Chirag Patel edited their review of gene: STAT5B: Changed phenotypes: Growth hormone insensitivity with immunodeficiency, OMIM #245590; Changed mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1183 | STAT5B | Chirag Patel reviewed gene: STAT5B: Rating: RED; Mode of pathogenicity: None; Publications: ; Phenotypes: ; Mode of inheritance: None | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1160 | SELENON | Zornitza Stark Mode of inheritance for gene: SELENON was changed from Unknown to BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1153 | TBC1D20 | Chirag Patel edited their review of gene: TBC1D20: Added comment: Liegel et al. (2013) analyzed the candidate gene TBC1D20 and identified homozygous mutations in 7 patients diagnosed with Warburg Micro syndrome from 5 families of different ethnic origins. Evaluation of human fibroblasts deficient in TBC1D20 function identified aberrant lipid droplet formation.; Changed rating: GREEN | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1147 | TDGF1 |
Chirag Patel edited their review of gene: TDGF1: Added comment: No OMIM number listed. 1 patient with TDGF1 mutation with midline anomalies of the forebrain. The mutant protein is inactive in a zebrafish rescue assay, indicating a role for TDGF1 in human midline and forebrain development.; Changed publications: PMID: 12073012; Changed mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted |
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| Intellectual disability syndromic and non-syndromic v0.1128 | TIMM8A |
Chirag Patel Source Genetic Health Queensland was removed from TIMM8A. Source Expert list was added to TIMM8A. Mode of inheritance for gene TIMM8A was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females Phenotypes for gene: TIMM8A were changed from to Mohr-Tranebjaerg syndrome; OMIM #304700 |
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| Intellectual disability syndromic and non-syndromic v0.1127 | TIMM8A | Chirag Patel reviewed gene: TIMM8A: Rating: RED; Mode of pathogenicity: None; Publications: ; Phenotypes: Mohr-Tranebjaerg syndrome, OMIM #304700; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1127 | TKT |
Chirag Patel Source Genetic Health Queensland was removed from TKT. Source Expert list was added to TKT. Mode of inheritance for gene TKT was changed from Unknown to BIALLELIC, autosomal or pseudoautosomal Phenotypes for gene: TKT were changed from to Short stature, developmental delay, and congenital heart defects; OMIM #617044 Publications for gene TKT were changed from PubMed: 27259054 to PubMed: 27259054 |
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| Intellectual disability syndromic and non-syndromic v0.1126 | TKT | Chirag Patel reviewed gene: TKT: Rating: GREEN; Mode of pathogenicity: None; Publications: PMID: 27259054; Phenotypes: Short stature, developmental delay, and congenital heart defects, OMIM #617044; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1043 | RAB40AL | Zornitza Stark Mode of inheritance for gene: RAB40AL was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.1041 | RAB40AL | Zornitza Stark reviewed gene: RAB40AL: Rating: RED; Mode of pathogenicity: None; Publications: 25044830; Phenotypes: MENTAL RETARDATION, X-LINKED, SYNDROMIC, MARTIN-PROBST TYPE; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.981 | POC1A | Zornitza Stark Phenotypes for gene: POC1A were changed from to Short stature, onychodysplasia, facial dysmorphism, and hypotrichosis, MIM#614813 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.978 | POC1A | Zornitza Stark reviewed gene: POC1A: Rating: RED; Mode of pathogenicity: None; Publications: ; Phenotypes: Short stature, onychodysplasia, facial dysmorphism, and hypotrichosis, MIM#614813; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.956 | PHKA2 | Zornitza Stark Mode of inheritance for gene: PHKA2 was changed from Unknown to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.954 | PHKA2 | Zornitza Stark reviewed gene: PHKA2: Rating: RED; Mode of pathogenicity: None; Publications: ; Phenotypes: Glycogen storage disease, type IXa1, MIM#306000; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.798 | ADRA2B |
Zornitza Stark gene: ADRA2B was added gene: ADRA2B was added to Intellectual disability, syndromic and non-syndromic_GHQ. Sources: Expert list Mode of inheritance for gene: ADRA2B was set to BOTH monoallelic and biallelic, autosomal or pseudoautosomal Publications for gene: ADRA2B were set to 24114805; 21937992 Phenotypes for gene: ADRA2B were set to Cortical myoclonus and epilepsy; Intellectual disability Review for gene: ADRA2B was set to RED Added comment: Two families reported but same mutation, ?founder effect. Most affected individuals had normal intellect. Another paper linking to AR intellectual disability but as part of manuscript reporting multiple novel candidates. Sources: Expert list |
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| Intellectual disability syndromic and non-syndromic v0.771 | CDK16 | Zornitza Stark Mode of inheritance for gene: CDK16 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.719 | B3GAT3 | Zornitza Stark Phenotypes for gene: B3GAT3 were changed from to Multiple joint dislocations, short stature, craniofacial dysmorphism, with or without congenital heart defects, MIM#245600 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.682 | AVPR2 | Zornitza Stark Mode of inheritance for gene: AVPR2 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.628 | AGPS | Zornitza Stark Phenotypes for gene: AGPS were changed from to Rhizomelic chondrodysplasia punctata, type 3, MIM#600121 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.526 | TRRAP | Chirag Patel commented on gene: TRRAP: 31 unrelated patients with global developmental delay and variably impaired intellectual development associated with de novo heterozygous mutations of TRRAP. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.524 | TRMT1 |
Chirag Patel edited their review of gene: TRMT1: Added comment: 4 families reported: -1 consanguineous Iranian family with 5 individuals with nonsyndromic moderate to severe impaired intellectual development. -1 consanguineous Iranian family with 3 adult brothers with global developmental delay and moderately delayed intellectual development -2 unrelated Pakistani families with 4 patients with impaired intellectual development. All with homozygous mutations in the TRMT1 gene which segregated with the disorder in the families, but functional studies of the variants were not performed.; Changed publications: PMID: 30289604, 26308914, 21937992 |
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| Intellectual disability syndromic and non-syndromic v0.515 | TUFM |
Chirag Patel edited their review of gene: TUFM: Added comment: Developmental regression seen as part of mitochondrial disorder - 3 families 1 patient with rapidly progressive encephalopathy and homozygous missense mutation in the TUFM gene. No functional studies. 2 families with 2 children each with COXPD4 and biallelic mutations in the TUFM gene. The mutations segregated with the disorder in the families. Complementation with wildtype TUFM restored the complex I and IV assembly and complex IV activity levels in fibroblasts from 1 of the patients.; Changed rating: AMBER |
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| Intellectual disability syndromic and non-syndromic v0.468 | WASHC5 | Chirag Patel Added comment: Comment on list classification: reviewed with Z.Stark - one family with founder mutation | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.446 | MTM1 |
Chirag Patel Source Genetic Health Queensland was removed from MTM1. Source Expert list was added to MTM1. Mode of inheritance for gene MTM1 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females Phenotypes for gene: MTM1 were changed from to Myotubular myopathy, X-linked; OMIM#310400 |
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| Intellectual disability syndromic and non-syndromic v0.445 | MTM1 | Chirag Patel reviewed gene: MTM1: Rating: RED; Mode of pathogenicity: None; Publications: ; Phenotypes: Myotubular myopathy, X-linked, OMIM#310400; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.435 | MPZ |
Chirag Patel Source Genetic Health Queensland was removed from MPZ. Source Expert list was added to MPZ. Mode of inheritance for gene MPZ was changed from Unknown to BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal Phenotypes for gene: MPZ were changed from to Various CMT types |
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| Intellectual disability syndromic and non-syndromic v0.434 | MPZ | Chirag Patel reviewed gene: MPZ: Rating: RED; Mode of pathogenicity: None; Publications: ; Phenotypes: Various CMT types; Mode of inheritance: BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.426 | MID2 |
Chirag Patel Source Genetic Health Queensland was removed from MID2. Source Expert list was added to MID2. Mode of inheritance for gene MID2 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females Phenotypes for gene: MID2 were changed from to ?Mental retardation, X-linked 101; OMIM#300928 Publications for gene MID2 were changed from PubMed: 24115387 to PubMed: 24115387 |
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| Intellectual disability syndromic and non-syndromic v0.425 | MID2 | Chirag Patel reviewed gene: MID2: Rating: RED; Mode of pathogenicity: None; Publications: PubMed: 24115387; Phenotypes: ?Mental retardation, X-linked 101, OMIM#300928; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.405 | MAGT1 |
Chirag Patel Source Genetic Health Queensland was removed from MAGT1. Source Expert list was added to MAGT1. Mode of inheritance for gene MAGT1 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females Phenotypes for gene: MAGT1 were changed from to Congenital disorder of glycosylation, type Icc, OMIM #301031; Immunodeficiency, X-linked, with magnesium defect, Epstein-Barr virus infection and neoplasia, OMIM #300853 Publications for gene MAGT1 were changed from PMID: 31036665 to PMID: 31036665 |
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| Intellectual disability syndromic and non-syndromic v0.404 | MAGT1 | Chirag Patel reviewed gene: MAGT1: Rating: AMBER; Mode of pathogenicity: None; Publications: PubMed: 31036665; Phenotypes: Congenital disorder of glycosylation, type Icc, OMIM #301031, Immunodeficiency, X-linked, with magnesium defect, Epstein-Barr virus infection and neoplasia, OMIM #300853; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.327 | GSPT2 | Zornitza Stark reviewed gene: GSPT2: Rating: RED; Mode of pathogenicity: None; Publications: 28414775; Phenotypes: ; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.302 | ZNF41 | Chirag Patel changed review comment from: Shoichet et al. (2003) described a female patient with severe nonsyndromic mental retardation and a de novo balanced translocation t(X;7)(p11.3;q11.21) in whom they cloned the DNA fragment that contained the X chromosomal and the autosomal breakpoint. In silico sequence analysis demonstrated that the ZNF41 gene was disrupted. Expression studies indicated that ZNF41 transcripts were absent in the patient cell line, suggesting that the mental disorder in this patient resulted from loss of functional ZNF41. Moreover, screening of a panel of patients with MRX led to the identification of 2 other ZNF41 mutations (314995.0001-314995.0002) that were not found in healthy control individuals. Based on their finding of the mutations in ZNF41 identified by Shoichet et al. (2003) in a total of 7 males in the NHLBI Exome Variant Server, and the additional finding of truncating ZNF41 variants in 1 male and 1 female in that database, Piton et al. (2013) classified the involvement of ZNF41 in mental retardation as highly questionable.; to: Shoichet et al. (2003) described a female patient with severe nonsyndromic mental retardation and a de novo balanced translocation t(X;7)(p11.3;q11.21) in whom they cloned the DNA fragment that contained the X chromosomal and the autosomal breakpoint. In silico sequence analysis demonstrated that the ZNF41 gene was disrupted. Expression studies indicated that ZNF41 transcripts were absent in the patient cell line, suggesting that the mental disorder in this patient resulted from loss of functional ZNF41. Screening of patients with mental retardation led to the identification of 2 other ZNF41 mutations that were not found in healthy control individuals. Based on their finding of the mutations in ZNF41 identified by Shoichet et al. (2003) in a total of 7 males in the NHLBI Exome Variant Server, and the additional finding of truncating ZNF41 variants in 1 male and 1 female in that database, Piton et al. (2013) classified the involvement of ZNF41 in mental retardation as highly questionable. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.297 | ZNF674 |
Chirag Patel Source Genetic Health Queensland was removed from ZNF674. Source Expert list was added to ZNF674. Mode of inheritance for gene ZNF674 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females |
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| Intellectual disability syndromic and non-syndromic v0.296 | ZNF674 | Chirag Patel reviewed gene: ZNF674: Rating: RED; Mode of pathogenicity: None; Publications: PMID: 16385466; Phenotypes: ; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.260 | GATA1 | Zornitza Stark Mode of inheritance for gene: GATA1 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.258 | GATA1 | Zornitza Stark reviewed gene: GATA1: Rating: RED; Mode of pathogenicity: None; Publications: ; Phenotypes: Thrombocytopenia, X-linked, with or without dyserythropoietic anaemia, MIM#300367, Thrombocytopenia with beta-thalassemia, X-linked, MIM#314050, Anemia, X-linked, with/without neutropenia and/or platelet abnormalities, MIM#300835; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.248 | FTL | Zornitza Stark Mode of inheritance for gene: FTL was changed from Unknown to BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.244 | FRMPD4 | Zornitza Stark Mode of inheritance for gene: FRMPD4 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.243 | FRMPD4 | Zornitza Stark reviewed gene: FRMPD4: Rating: GREEN; Mode of pathogenicity: None; Publications: 25644381, 29267967; Phenotypes: Mental retardation, X-linked 104, MIM#300983; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.213 | FANCD2 | Zornitza Stark Phenotypes for gene: FANCD2 were changed from to Fanconi anemia, complementation group D2, MIM# 227646 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.211 | FANCD2 | Zornitza Stark reviewed gene: FANCD2: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Fanconi anemia, complementation group D2, MIM# 227646; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.206 | FAAH2 | Zornitza Stark Mode of inheritance for gene: FAAH2 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.204 | FAAH2 | Zornitza Stark reviewed gene: FAAH2: Rating: RED; Mode of pathogenicity: None; Publications: 25885783; Phenotypes: Neuropsychiatric disorder; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.195 | EXOSC2 |
Zornitza Stark gene: EXOSC2 was added gene: EXOSC2 was added to Intellectual disability, syndromic and non-syndromic_GHQ. Sources: Expert list Mode of inheritance for gene: EXOSC2 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: EXOSC2 were set to 26843489; 31628467 Phenotypes for gene: EXOSC2 were set to Short stature, hearing loss, retinitis pigmentosa, and distinctive facies, MIM# 617763 Review for gene: EXOSC2 was set to GREEN Added comment: Three individuals from two families, but founder mutation, some functional data. Sources: Expert list |
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| Intellectual disability syndromic and non-syndromic v0.117 | DPH1 | Zornitza Stark Phenotypes for gene: DPH1 were changed from to Developmental delay with short stature, dysmorphic facial features, and sparse hair, MIM#616901 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.114 | DPH1 | Zornitza Stark reviewed gene: DPH1: Rating: GREEN; Mode of pathogenicity: None; Publications: 25558065, 26220823; Phenotypes: Developmental delay with short stature, dysmorphic facial features, and sparse hair, MIM#616901; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.6 | CDK16 | Zornitza Stark reviewed gene: CDK16: Rating: AMBER; Mode of pathogenicity: None; Publications: 25644381; Phenotypes: Intellectual disability; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5 | B3GAT3 | Zornitza Stark reviewed gene: B3GAT3: Rating: RED; Mode of pathogenicity: None; Publications: ; Phenotypes: Multiple joint dislocations, short stature, craniofacial dysmorphism, with or without congenital heart defects, MIM#245600; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5 | AVPR2 | Zornitza Stark reviewed gene: AVPR2: Rating: RED; Mode of pathogenicity: None; Publications: ; Phenotypes: Diabetes insipidus, nephrogenic, MIM#304800; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5 | ATP6AP1 |
Zornitza Stark gene: ATP6AP1 was added gene: ATP6AP1 was added to Intellectual disability, syndromic and non-syndromic_GHQ. Sources: Expert list Mode of inheritance for gene: ATP6AP1 was set to X-LINKED: hemizygous mutation in males, biallelic mutations in females Publications for gene: ATP6AP1 were set to 27231034 Phenotypes for gene: ATP6AP1 were set to Immunodeficiency 47, MIM#300972 Review for gene: ATP6AP1 was set to GREEN gene: ATP6AP1 was marked as current diagnostic Added comment: 11 males from 6 unrelated families with primarily an immunodeficiency disorder; six patients from 3 families who carried the same variant (E346K) had neurologic features, including seizures, mild intellectual disability, and behavioral abnormalities Sources: Expert list |
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| Intellectual disability syndromic and non-syndromic v0.0 | AGPS | Zornitza Stark reviewed gene: AGPS: Rating: RED; Mode of pathogenicity: None; Publications: ; Phenotypes: Rhizomelic chondrodysplasia punctata, type 3, MIM#600121; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.0 | TAT |
Zornitza Stark gene: TAT was added gene: TAT was added to Intellectual disability, syndromic and non-syndromic_GHQ. Sources: Expert Review Green,Genetic Health Queensland Mode of inheritance for gene: TAT was set to Unknown |
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| Intellectual disability syndromic and non-syndromic v0.0 | STAT5B |
Zornitza Stark gene: STAT5B was added gene: STAT5B was added to Intellectual disability, syndromic and non-syndromic_GHQ. Sources: Expert Review Green,Genetic Health Queensland Mode of inheritance for gene: STAT5B was set to Unknown |
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