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| Mendeliome v1.2244 | DDX53 |
Chirag Patel gene: DDX53 was added gene: DDX53 was added to Mendeliome. Sources: Literature Mode of inheritance for gene: DDX53 was set to X-LINKED: hemizygous mutation in males, biallelic mutations in females Publications for gene: DDX53 were set to PMID: 39706195 Phenotypes for gene: DDX53 were set to autism spectrum disorder MONDO:0005258 Review for gene: DDX53 was set to GREEN Added comment: The DDX53 gene is a single-exon RNA helicase which lies intronic to PTCHD1-AS (a multi-isoform long noncoding RNA (lncRNA) at the Xp22.11 locus. It is thought to play a role in RNA decay, RNA processing, ribosome biogenesis, and translation initiation. 9 affected males and 3 affected females from 9 unrelated families with ASD and rare, predicted damaging or loss-of-function variants in DDX53 (including a gene deletion involving DDX53 and exons of the noncoding RNA PTCHD1-AS). A further 26 individuals with ASD were identified (from Autism Speaks MSSNG and Simons Foundation Autism Research Initiative) with 19 rare, damaging DDX53 variations (mostly maternally inherited). No functional evidence. Sources: Literature |
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| Mendeliome v1.1992 | RFC4 |
Chirag Patel gene: RFC4 was added gene: RFC4 was added to Mendeliome. 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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| Mendeliome v1.1733 | SUPT7L |
Chirag Patel gene: SUPT7L was added gene: SUPT7L was added to Mendeliome. Sources: Literature Mode of inheritance for gene: SUPT7L was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: SUPT7L were set to PMID: 38592547 Phenotypes for gene: SUPT7L were set to Lipodystrophy, MONDO:0006573 Review for gene: SUPT7L was set to RED Added comment: 1 case with generalised lipodystrophy, growth retardation, congenital cataracts, severe developmental delay and progeriod features. Trio WGS identified compound heterozygous variants in SUPT7L (missense causing abnormal splicing + frameshift). Variants validated with Sanger. SUPT7L encodes a component of the core structural module of the STAGA complex - a nuclear multifunctional protein complex that plays a role in various cellular processes (e.g. transcription factor binding, protein acetylation, splicing, and DNA damage control). Immunolabelling in fibroblasts from patient showed complete absence of SUPT7L protein. Transcriptome data from individual revealed downregulation of several gene sets associated with DNA replication, DNA repair, cell cycle, and transcription. Sources: Literature |
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| Mendeliome v1.1340 | CCDC66 |
Anna Ritchie gene: CCDC66 was added gene: CCDC66 was added to Mendeliome. Sources: Literature Mode of inheritance for gene: CCDC66 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: CCDC66 were set to PMID: 37852749 Review for gene: CCDC66 was set to RED Added comment: Nonsense variant (c.172C>T, p.Q58X) segregating in family with 5 affected members with high myopia (HM). Additionally, one family member with the variant displayed no symptoms, hinting at possible incomplete penetrance. Six other rare variants were identified in 200 sporadic high myopia patients that could potentially be linked to HM. A deficiency in CCDC66 might disrupt cell proliferation by influencing the mitotic process during retinal growth, leading to HM. Sources: Literature |
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| Mendeliome v1.1318 | ZFHX3 | Zornitza Stark edited their review of gene: ZFHX3: Added comment: 41 individuals 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 publications: 37292950; Changed phenotypes: Neurodevelopmental disorder, MONDO:0700092, ZFHX3-related | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v1.957 | ERI1 |
Elena Savva gene: ERI1 was added gene: ERI1 was added to Mendeliome. 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 Spondyloepimetaphyseal dysplasia (MONDO#0100510), ERI1-related, 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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| Mendeliome v1.635 | MIR145 |
Lucy Spencer gene: MIR145 was added gene: MIR145 was added to Mendeliome. Sources: Literature Mode of inheritance for gene: MIR145 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: MIR145 were set to 36649075 Phenotypes for gene: MIR145 were set to multisystemic smooth muscle dysfunction syndrome (MONDO:0013452), MIR145-related Review for gene: MIR145 was set to RED Added comment: PMID: 36649075- a patient whose fetal ultrasound revealed polyhydramnios, enlarged abdomenand bladder, and prune belly syndrome. During infancy/childhood profound gastrointestinal dysmotility, cerebrovascular disease, and multiple strokes. Described as a multisystemic smooth muscle dysfunction syndrome. Patient was found to have a de novo SNP in MIR145 NR_029686.1:n.18C>A. The MIR145transcript is processed into two microRNAs, with the variant position at nucleotide 3 of miR-145-5p. Transfection of an siRNA against mutant miR145-5p induced a notable decrease in the expression of several cytoskeletal proteins including transgelin, calponin, and importantly, smooth muscle actin. Hybridization analysis and miR RNA-seq demonstrated a decrease in expression of miR145-5p in the presence of mutant miR145-5p. RNA-seq showed that the differentially expressed genes were substantially different between patient and control fibroblasts. Sources: Literature |
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| Mendeliome v0.10518 | PRDM9 |
Zornitza Stark gene: PRDM9 was added gene: PRDM9 was added to Mendeliome. Sources: Literature Mode of inheritance for gene: PRDM9 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: PRDM9 were set to 34257419 Phenotypes for gene: PRDM9 were set to Inherited primary ovarian failure MONDO:0019852 Review for gene: PRDM9 was set to GREEN Added comment: The primordial follicle pool is determined by the meiosis process, which is initiated by programmed DNA double strand breaks (DSB) and homologous recombination. PRDM9 is a meiosis-specific histone H3 methyltransferase and a major determinant of meiotic recombination hotspots in mammals. 3 pathogenic heterozygous variants in PRDM9 identified in 4 patients with POI. Functional studies showed the variants in PRDM9 impaired its methyltransferase activity. Prdm9+/- mice were subfertile, and showed increased percentage of germ cells at abnormal pachytene stage with decreased number of PRDM9-dependent DSBs and insufficient recombination. Sources: Literature |
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| Mendeliome v0.9776 | NEBL | Bryony Thompson Added comment: Comment on list classification: Limited gene-disease vailidity, Classification - 09/25/2020 by ClinGen Dilated Cardiomyopathy GCEP. Evidence Summary: NEBL was evaluated for autosomal dominant dilated cardiomyopathy (DCM). Human genetic evidence supporting this gene-disease relationship includes case-level data. Arimura and colleagues (2000, PMID: 11140941) analyzed 83 DCM patients and 311 healthy controls, identifying 4 missense variants of unknown significance (VUSs) in 4 DCM cases. High minor allele frequencies (MAFs) and lack of segregation excluded these variants as evidence. Purevjav and colleagues (2010, PMID: 20951326) investigated a total of 260 DCM patients and 300 unrelated ethnic matched controls by direct DNA sequencing. Authors identified 4 missense VUSs. One of these variants (Q128R) was downgraded in level of evidence due to the lack of segregation. The other 3 variants were not scored because of their MAF. Perrot and colleagues (2016, PMID: 27186169) investigated a total of 389 patients with DCM, HCM, or LVNC, 320 Caucasian sex-matched controls and 192 Caucasian sex-matched blood donors and identified 3 missense VUSs in 4 families. One of these variants was also carried by healthy relatives and therefore was excluded, however this may be explained by reduced penetrance. The 2 other variants lacked segregation as well and therefore were also excluded. In addition, this gene-disease association is supported by animal models. Mastronotaro and colleagues (2015, PMID: 25987543) created a NEBL knockout mice that exhibited normal cardiac function up to 9 months of age but after 2 weeks of transaortic constriction (TAC), these mice showed Z-line widening since the age of 5 months and upregulation of cardiac stress genes (basal and after TAC) However, absence of clinical DCM features in KO-NEBL mice as well as Western Blot analysis which contradicted previous findings by showing a similar protein expression between knockout and wild-type mice, excluding it as evidence. Purevjav and colleagues (2010, PMID: 20951326) generated a transgenic mouse overexpressing WT or mutant NEBL under the control of the α-MyHC promoter (4 variants were tested). Mice overexpressing p.K60N or p.Q128R variants died within 1 year because of severe heart enlargement and heart failure. Mice overexpressing p.G202R or p.A592E were born and developed normally but after 6 months displayed reduced stress tolerance, cardiac enlargement due to left ventricle dilation, myocyte disarray, and interstitial cell infiltration. In summary, there is limited evidence to support this gene-disease relationship. More evidence is needed to support the relationship of NEBL and autosomal dominant DCM. This classification was approved by the ClinGen Dilated Cardiomyopathy Working Group on October 11, 2019 (SOP Version 7). Gene Clinical Validity Standard Operating Procedures (SOP) - SOP7 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.9559 | PCSK1 | Zornitza Stark Phenotypes for gene: PCSK1 were changed from to Obesity with impaired prohormone processing MIM#600955 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.9556 | PCSK1 | Zornitza Stark reviewed gene: PCSK1: Rating: GREEN; Mode of pathogenicity: None; Publications: 30383237; Phenotypes: Obesity with impaired prohormone processing MIM#600955; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.8736 | PIDD1 |
Zornitza Stark gene: PIDD1 was added gene: PIDD1 was added to Mendeliome. Sources: Expert Review 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 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. 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. Sources: Expert Review |
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| Mendeliome v0.8462 | RAD21 | Zornitza Stark Phenotypes for gene: RAD21 were changed from ?Mungan syndrome, 611376; Cornelia de Lange syndrome 4, 614701; Holoprocencephaly to Mungan syndrome, 611376; Cornelia de Lange syndrome 4, 614701; Holoprocencephaly | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.6766 | LRRC8A | Bryony Thompson changed review comment from: A single case reported with a reciprocal translocation, t(9;20)(q33.2;q12), and demonstrated truncation of the LRRC8A gene. No other supporting evidence; to: A single case reported with a reciprocal translocation, t(9;20)(q33.2;q12), and demonstrated truncation of the LRRC8A gene. No other supporting evidence could be identified. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.6149 | NOS1AP |
Zornitza Stark edited their review of gene: NOS1AP: Added comment: Nephrotic syndrome type 22 (NPHS22) is an autosomal recessive renal disease characterized by onset of progressive kidney dysfunction in infancy. Affected individuals usually present with edema associated with hypoproteinemia, proteinuria, and microscopic hematuria. Renal biopsy shows effacement of the podocyte foot processes, glomerulosclerosis, and thickening of the glomerular basement membrane. The disease is steroid-resistant and progressive, resulting in end-stage renal disease usually necessitating kidney transplant. Two unrelated families and animal model. No PMID yet: https://advances.sciencemag.org/content/7/1/eabe1386; Changed rating: GREEN; Changed phenotypes: Nephrotic syndrome, type 22, MIM# 619155; Changed mode of inheritance: BIALLELIC, autosomal or pseudoautosomal |
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| Mendeliome v0.5914 | RNU7-1 |
Ee Ming Wong changed review comment from: - 16 affected individuals from 11 families - - Compared to control fibroblasts, patient fibroblasts were enriched for misprocessed forms of replication-dependent histone (RDH) mRNAs Sources: Literature; to: - 16 affected individuals from 11 families - Compared to control fibroblasts, patient fibroblasts were enriched for misprocessed forms of replication-dependent histone (RDH) mRNAs Sources: Literature |
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| Mendeliome v0.5914 | RNU7-1 |
Ee Ming Wong gene: RNU7-1 was added gene: RNU7-1 was added to Mendeliome. Sources: Literature Mode of inheritance for gene: RNU7-1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: RNU7-1 were set to PMID: 33230297 Phenotypes for gene: RNU7-1 were set to PMID: 33230297 Review for gene: RNU7-1 was set to GREEN gene: RNU7-1 was marked as current diagnostic Added comment: - 16 affected individuals from 11 families - - Compared to control fibroblasts, patient fibroblasts were enriched for misprocessed forms of replication-dependent histone (RDH) mRNAs Sources: Literature |
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| Mendeliome v0.5914 | LSM11 |
Ee Ming Wong gene: LSM11 was added gene: LSM11 was added to Mendeliome. Sources: Literature Mode of inheritance for gene: LSM11 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: LSM11 were set to PMID: 33230297 Phenotypes for gene: LSM11 were set to type I interferonopathy Aicardi–Goutières syndrome Review for gene: LSM11 was set to AMBER gene: LSM11 was marked as current diagnostic Added comment: - Two affected siblings from a consanguineous family carrying a homozygous variant in LSM11 - Compared to control fibroblasts, patient fibroblasts were enriched for misprocessed forms of replication-dependent histone (RDH) mRNAs - Knockdown of LSM11 in THP-1 cells results in an increase in misprocessed RDH mRNA and interferon signaling Sources: Literature |
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| Mendeliome v0.5556 | DAAM2 |
Ain Roesley gene: DAAM2 was added gene: DAAM2 was added to Mendeliome. Sources: Literature Mode of inheritance for gene: DAAM2 was set to BIALLELIC, autosomal or pseudoautosomal Phenotypes for gene: DAAM2 were set to steroid-resistant nephrotic syndrome (SRNS) Penetrance for gene: DAAM2 were set to unknown Review for gene: DAAM2 was set to GREEN Added comment: - steroid-resistant nephrotic syndrome (SRNS) with focal segmental glomerulosclerosis on histologic analysis of kidney biopsies and foot process effacement shown by electron microscopy (authors have suggested the term nephrotic syndrome type 22 (NPHS22)) - 4 unrelated families, 3 of which were consanguineous - 4 unique missense and 1 stop - in vitro studies done for the missense variants Sources: Literature |
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| Mendeliome v0.4685 | RPL9 | Arina Puzriakova changed review comment from: PMID: 31799629 (2020) - One individual diagnosed with Diamond Blackfan anaemia carrying a de novo variant (c.-2+1G>C) in the 5′UTR of RPL9, predicted to affect the donor splice site of exon 1. Functional studies showed the variant impairs processing of pre-rRNA during ribosome biogenesis, stabilises TP53 and impairs the proliferation and differentiation of erythroid cells. Zebrafish models of RPL9 LoF recapitulate the anaemia phenotype.; to: PMID: 31799629 (2020) - Female infant diagnosed with Diamond-Blackfan anaemia carrying a de novo variant (c.-2+1G>C) in the 5′UTR of RPL9, predicted to affect the donor splice site of exon 1. Phenotypic overlap can be seen with the previously reported case with the same variant, including colitis, thumb anomaly, and microcephaly. Functional studies showed the variant impairs processing of pre-rRNA during ribosome biogenesis, stabilises TP53 and impairs the proliferation and differentiation of erythroid cells. Zebrafish models of RPL9 LoF recapitulate the anaemia phenotype. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.3732 | FAM50A |
Zornitza Stark gene: FAM50A was added gene: FAM50A was added to Mendeliome. 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) 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.). Sources: Literature |
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| Mendeliome v0.3327 | KIF21B |
Zornitza Stark gene: KIF21B was added gene: KIF21B was added to Mendeliome. Sources: Expert Review Mode of inheritance for gene: KIF21B was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted 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 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: Expert Review |
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| Mendeliome v0.3248 | ASPRV1 |
Ee Ming Wong gene: ASPRV1 was added gene: ASPRV1 was added to Mendeliome. Sources: Literature Mode of inheritance for gene: ASPRV1 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: ASPRV1 were set to PMID: 32516568 Phenotypes for gene: ASPRV1 were set to palmoplantar keratoderma; lamellar ichthyosis Review for gene: ASPRV1 was set to GREEN gene: ASPRV1 was marked as current diagnostic Added comment: -3 heterozygous missense variants identified across 4 unrelated kindreds -mutant ASPRV1 expressed in human keratinocytes suggests impaired filaggrin processing Sources: Literature |
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| Mendeliome v0.3241 | BTG4 |
Ain Roesley gene: BTG4 was added gene: BTG4 was added to Mendeliome. Sources: Literature Mode of inheritance for gene: BTG4 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: BTG4 were set to PMID: 32502391 Phenotypes for gene: BTG4 were set to Zygotic cleavage failure (ZCF) Penetrance for gene: BTG4 were set to unknown Added comment: PMID: 32502391 - 4 affecteds from 4 families including 3 consanguineous families. 3 PTVs + 1 splice. - in vitro assays in HELA cells showed all PTVs had complete loss of protein. The missense variant had abolished interaction with CNOT7 - In vivo studies further demonstrated that the process of maternal mRNA decay was disrupted in the zygotes of the affected individuals, which provides a mechanistic explanation for the phenotype of ZCF Sources: Literature |
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| Mendeliome v0.3206 | RAD21 | Zornitza Stark Phenotypes for gene: RAD21 were changed from to ?Mungan syndrome, 611376; Cornelia de Lange syndrome 4, 614701; Holoprocencephaly | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.3049 | RAD21 | Elena Savva reviewed gene: RAD21: Rating: GREEN; Mode of pathogenicity: None; Publications: PMID: 31334757, 25575569, 32193685; Phenotypes: ?Mungan syndrome, 611376, Cornelia de Lange syndrome 4, 614701, Holoprocencephaly; Mode of inheritance: BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.2372 | ACKR3 |
Elena Savva gene: ACKR3 was added gene: ACKR3 was added to Mendeliome. Sources: Literature Mode of inheritance for gene: ACKR3 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: ACKR3 were set to PMID: 3121183 Phenotypes for gene: ACKR3 were set to Oculomotor synkinesis Review for gene: ACKR3 was set to AMBER Added comment: No phenotype currently listed in OMIM PMID: 3121183 - 1 family (3 siblings and a cousin) with congenital ptosis and oculomotor synkinesis. Mouse model reciprocated the phenotype. Functional assay using transfected HEK293 cells show protein mislocalization and lower binding affinity Emerging gene-disease association Sources: Literature |
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| Mendeliome v0.2365 | FUS |
Elena Savva gene: FUS was added gene: FUS was added to Mendeliome. Sources: Literature Mode of inheritance for gene: FUS was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: FUS were set to PMID: 32281455; 20668259; 20385912 Phenotypes for gene: FUS were set to Amyotrophic lateral sclerosis 6, with or without frontotemporal dementia 608030; Essential tremor, hereditary, 4 614782 Mode of pathogenicity for gene: FUS was set to Other Review for gene: FUS was set to GREEN Added comment: PMID: 32281455 - Reports a case of Pediatric Amyotrophic Lateral Sclerosis. Reviews and shows multiple other reports of ALS casued by FUS PMID: 20668259 - additional reports of ALS PMID: 20385912 - postulated that disruption of this region may disrupt subcellular distribution of FUS, in turn affecting transcription and RNA processing and conferring a toxic gain of function. Sources: Literature |
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| Mendeliome v0.780 | SLC9A7 |
Zornitza Stark gene: SLC9A7 was added gene: SLC9A7 was added to Mendeliome_VCGS. Sources: Literature Mode of inheritance for gene: SLC9A7 was set to X-LINKED: hemizygous mutation in males, biallelic mutations in females Publications for gene: SLC9A7 were set to 30335141 Phenotypes for gene: SLC9A7 were set to Intellectual developmental disorder, X-linked 108; OMIM #301024 Review for gene: SLC9A7 was set to AMBER Added comment: 6 males from 2 unrelated families with hemizygous missense mutation in the SLC9A7 gene. The mutation segregated with the disorder in the family. In vitro functional expression studies in CHO cells (AP-1 cells) showed that the mutation caused decreased levels of protein expression and reduced oligosaccharide maturation/glycosylation compared to wildtype, indicating impaired posttranslational processing. Subcellular localization studies indicated that protein trafficking was unaffected by the mutation. However, examination of the trans-Golgi compartment suggested a gain-of-function effect and a perturbation of glycosylation of secretory cargo. Serum transferrin studies in 1 patient suggested a glycosylation defect. Sources: Literature |
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| Mendeliome v0.514 | PROC | Zornitza Stark Marked gene: PROC as ready | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.514 | PROC | Zornitza Stark Gene: proc has been classified as Green List (High Evidence). | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.514 | PROC | Zornitza Stark Publications for gene: PROC were set to | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.514 | PROC | Zornitza Stark Phenotypes for gene: PROC were changed from to Thrombophilia due to protein C deficiency, autosomal dominant (176860); Thrombophilia due to protein C deficiency, autosomal recessive (612304) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.513 | PROC | Zornitza Stark Mode of inheritance for gene: PROC was changed from Unknown to BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.512 | PROC | Chris Richmond reviewed gene: PROC: Rating: GREEN; Mode of pathogenicity: None; Publications: 22545135, 30925296; Phenotypes: Thrombophilia due to protein C deficiency, autosomal dominant (176860), Thrombophilia due to protein C deficiency, autosomal recessive (612304); Mode of inheritance: BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.0 | PROC |
Zornitza Stark gene: PROC was added gene: PROC was added to Mendeliome_VCGS. Sources: Expert Review Green,Victorian Clinical Genetics Services Mode of inheritance for gene: PROC was set to Unknown |
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