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Mendeliome v1.2048 BMP5 Chirag Patel gene: BMP5 was added
gene: BMP5 was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: BMP5 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: BMP5 were set to Skeletal dysostosis and atrioventricular septal defect, no OMIM#
Phenotypes for gene: BMP5 were set to Skeletal dysostosis and atrioventricular septal defect, no OMIM#
Review for gene: BMP5 was set to RED
Added comment: 1 patient with skeletal dysostosis, atrioventricular septal defect, hypermobility, laryngo-tracheo-bronchomalacia and dysmorphic features (malar hypoplasia, short palpebral fissures, short nose, low nasal bridge, anteverted nares, long philtrum, small ears with abnormally folded antihelix). Skeletal survey showed mild thoracolumbar scoliosis, four sacral segments, absent ossification of the inferior pubic rami, and patellar aplasia. Trio WGS identified compound heterozygous loss of function variants in BMP5 (c.88_89del, p.(Gly30Argfs*11) and c.1104+2del, p.(?). Abnormal splicing was proven on the suspected splice variant using maternal fibroblasts. BMP5 expression is confined to specific parts of the skeleton and cartilage in mice and is tightly regulated by different enhancers. Previous studies of chicken embryonic heart development showed BMP5 expression in the endoderm underlying the precardiac mesoderm, the myocardium of the atrioventricular canal and outflow tract regions. Other bone morphogenetic proteins are linked to several genetic skeletal disorders.
Sources: Literature
Mendeliome v1.2022 PSKH1 Zornitza Stark gene: PSKH1 was added
gene: PSKH1 was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: PSKH1 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: PSKH1 were set to 39132680
Phenotypes for gene: PSKH1 were set to Cholestasis, progressive familial intrahepatic, 13, MIM# 620962
Review for gene: PSKH1 was set to GREEN
Added comment: 4 consanguineous families (out of 279 families) with intrahepatic cholestasis:
-1 patient died at 10mths with cholestasis/liver impairment and kidney impairment
-3 cousins with cholestasis (2 with liver failure needing transplant) and kidney features (2 with kidney failure, 1 with renal echogenicity)
-2 siblings with hepatic fibrosis (1 with unilateral renal agenesis)
-2 siblings with unexplained liver cirrhosis (1 needing transplant) but normal kidney function

WES identified 3 different homozygous variants in PSKH1 (Arg121Trp, Ile126Val, Arg183Cys). Patient fibroblasts displayed abnormal cilia that are long and show abnormal transport. A homozygous Pskh1 mutant mouse faithfully recapitulated the human phenotype and displayed abnormally long cilia. The phenotype could be rationalized by the loss of catalytic activity observed for each recombinant PSKH1 variant using in vitro kinase assays. Human PSKH1 is a poorly understood gene that may play important role in intracellular trafficking, is sensitive to intracellular Ca2+ concentration, and is localized to centrosomes, suggesting a link to cystogenesis.
Sources: Literature
Mendeliome v1.1998 FKBP4 Mark Cleghorn gene: FKBP4 was added
gene: FKBP4 was added to Mendeliome. 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
Mendeliome v1.1961 VPS52 Bryony Thompson gene: VPS52 was added
gene: VPS52 was added to Mendeliome. Sources: Other
Mode of inheritance for gene: VPS52 was set to BIALLELIC, autosomal or pseudoautosomal
Phenotypes for gene: VPS52 were set to complex neurodevelopmental disorder with or without congenital anomalies MONDO:0100465
Review for gene: VPS52 was set to AMBER
Added comment: HGSA poster (P110) from Louise Bicknell's group at the University of Otago. 11 cases from 8 families (USA, NZ, Saudi Arabia) with a broad syndromic developmental delay phenotype with biallelic variants (both missense & truncating).
Sources: Other
Mendeliome v1.1924 UNC93B1 Zornitza Stark edited their review of gene: UNC93B1: Added comment: PMID 38869500: Rare missense substitutions in UNC93B1 in probands from five unrelated kindreds presenting with early onset SLE (two probands) or CBL (three probands). Clinical, genetic, and functional in vitro and ex vivo data demonstrating changes in TLR7/8 signalling and trafficking.; Changed rating: GREEN; Changed publications: 29768176, 38869500; Changed phenotypes: Encephalopathy, acute, infection-induced (herpes-specific), susceptibility to, 1, Autoinflammatory syndrome, MONDO:0019751, UNC93B1-related; Changed mode of inheritance: BOTH monoallelic and biallelic, autosomal or pseudoautosomal
Mendeliome v1.1888 CRNKL1 Mark Cleghorn gene: CRNKL1 was added
gene: CRNKL1 was added to Mendeliome. Sources: Other
Mode of inheritance for gene: CRNKL1 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Phenotypes for gene: CRNKL1 were set to complex neurodevelopmental disorder MONDO:0100038
Review for gene: CRNKL1 was set to GREEN
Added comment: Unpublished, presented at ESHG June 2024 - Louise Bicknell, University of Otago NZ
8 unrelated families via gene matcher with rare, de novo, missense variants in CRNKL1
severe microcephaly (all, -8 to -11 SD)
ID/epilepsy
pontocerebellar hypoplasia (6/8)
simplified gyration (8/8)
7 variants are missense at p.Arg267 residue
1 variant missense at p.Arg301
RNA-seq on patient fibroblasts - no alteration in gene expression
Zebrafish homolog of Arg267 and Arg301 - mimics observed phenotype (reduced brain development), increased in embryo apoptosis
RNA seq on affected zebrafish embryos - transcriptome strongly disrupted
Splicing analysis in progress

CRKNL1 supports U6 structure in spliceosome
Sources: Other
Mendeliome v1.1638 TCN1 Bryony Thompson gene: TCN1 was added
gene: TCN1 was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: TCN1 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: TCN1 were set to 29764838; 19686235
Phenotypes for gene: TCN1 were set to transcobalamin I deficiency MONDO:0008659
Review for gene: TCN1 was set to AMBER
Added comment: Unclear if TC1 deficiency is associated with a clinical phenotype and only found 2 families with genetic findings. 1 confirmed chet (2 truncating variants) with severe TC 1 deficiency (depression and anxiety only reported symptoms, had sickle cell trait) & another family with 2 siblings that are presumed homozygous for a truncating variant (no plasma or serum TC 1 levels but no DNA available for genetic testing) which was found heterozygous in multiple first-degree relatives. Unclear if there is a clinical phenotype. Heterozygous individuals displayed mildly low or low-normal TC 1 serum levels. Also, 4 homozygotes were identified in a study of a loss-of-function variant associated with lower vitamin B12 concentration in African Americans but there was limited ability to assess the clinical impact of the recessive disease
Sources: Literature
Mendeliome v1.1454 PRICKLE2 Zornitza Stark Phenotypes for gene: PRICKLE2 were changed from Neurodevelopmental disorder, MONDO:0700092; global developmental delay, behavioural difficulties ± epilepsy, autistic features, and attention deficit hyperactive disorder. to Neurodevelopmental disorder MONDO:0700092, PRICKLE2-related
Mendeliome v1.1453 PRICKLE2 Zornitza Stark Publications for gene: PRICKLE2 were set to 34092786
Mendeliome v1.1452 PRICKLE2 Zornitza Stark Classified gene: PRICKLE2 as Amber List (moderate evidence)
Mendeliome v1.1452 PRICKLE2 Zornitza Stark Gene: prickle2 has been classified as Amber List (Moderate Evidence).
Mendeliome v1.1451 PRICKLE2 Zornitza Stark reviewed gene: PRICKLE2: Rating: AMBER; Mode of pathogenicity: None; Publications: 34092786, 21276947, 26942291, 26942292; Phenotypes: Neurodevelopmental disorder MONDO:0700092, PRICKLE2-related; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Mendeliome v1.1451 PRICKLE1 Zornitza Stark Classified gene: PRICKLE1 as Red List (low evidence)
Mendeliome v1.1451 PRICKLE1 Zornitza Stark Gene: prickle1 has been classified as Red List (Low Evidence).
Mendeliome v1.1450 PRICKLE1 Zornitza Stark edited their review of gene: PRICKLE1: Added comment: LIMITED by ClinGen for AR PME and DISPUTED for AD epilepsy.; Changed rating: RED
Mendeliome v1.1450 PRICKLE1 Zornitza Stark Classified gene: PRICKLE1 as Amber List (moderate evidence)
Mendeliome v1.1450 PRICKLE1 Zornitza Stark Gene: prickle1 has been classified as Amber List (Moderate Evidence).
Mendeliome v1.1449 PRICKLE1 Zornitza Stark edited their review of gene: PRICKLE1: Added comment: Note all ClinVar entries for this gene are VOUS/LB/B. The variants reported in bi-allelic cases are almost all missense without further supportive data.; Changed rating: AMBER
Mendeliome v1.1330 CASP2 Lisa Norbart gene: CASP2 was added
gene: CASP2 was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: CASP2 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: CASP2 were set to 37880421
Phenotypes for gene: CASP2 were set to neurodevelopmental disorder MONDO:0700092, CASP2-related
Penetrance for gene: CASP2 were set to Complete
Review for gene: CASP2 was set to GREEN
gene: CASP2 was marked as current diagnostic
Added comment: 7 patients from 5 families
4 families hom for PTCs, 1 family Chet for splice+PTC
RNA studies done for the splice to indicate usage of two cryptic splice donor sites

5/5 have ID/dev delay
1/5 has seizures
2/5 hypotonia
3/5 lissencephaly (pachygyria and cortical thickening)
Sources: Literature
Mendeliome v1.1054 STX5 Ain Roesley gene: STX5 was added
gene: STX5 was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: STX5 was set to BIALLELIC, autosomal or pseudoautosomal
Phenotypes for gene: STX5 were set to congenital disorder of glycosylation MONDO#0015286, STX5-related
Review for gene: STX5 was set to AMBER
gene: STX5 was marked as current diagnostic
Added comment: 1x family with 3x deceased shortly after death + 3x spontaneous abortions + 2x abortions due to abnormal fatal ultrasound (US).
Hom for NM_003164.4:c.163 A > G p.(Met55Val), which results in complete loss of short isoform (which uses Met55 as the start)

phenotype: short long bones on US, dysmorphism, skeletal dysplasia, profound hypotonia, hepatomegaly elevated cholesterol.
Post-natally they died of progressive liver failure with cholestasis and hyperinsulinemic hypoglycemias

Primary human dermal fibroblasts isolated from these patients show defective glycosylation, altered Golgi morphology as measured by electron microscopy, mislocalization of glycosyltransferases, and compromised ER-Golgi trafficking
Sources: Literature
Mendeliome v1.978 DENND5B Chirag Patel gene: DENND5B was added
gene: DENND5B was added to Mendeliome. Sources: Other
Mode of inheritance for gene: DENND5B was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Phenotypes for gene: DENND5B were set to Neurodevelopmental disorder with white matter anomalies
Review for gene: DENND5B was set to GREEN
gene: DENND5B was marked as current diagnostic
Added comment: ESHG 2023:
7 patients/7 families with de novo DENND5B variants (6 missense, 1 splice)
DD/ID (mod/profound)(7/7), white matter anomalies (6/7) hypotonia, epilepsy (3/7)

DENND5B acts as:
-GEF for activation of RAB proteins which are involved in membrane trafficking and neurotransmitter release
-regulator of lipid absorption and homeostasis

Functional studies showed loss of expression of DENND5B in fibroblasts, abnormal vesicle trafficking, and impaired lipid uptake and intracellular distribution
Sources: Other
Mendeliome v1.601 TRPC5 Hazel Phillimore gene: TRPC5 was added
gene: TRPC5 was added to Mendeliome. 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 PMID: 36323681; 24817631; 23033978; 33504798; 28191890
Phenotypes for gene: TRPC5 were set to Intellectual disability; autistic spectrum disorder
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
Mendeliome v1.580 CCIN Chern Lim gene: CCIN was added
gene: CCIN was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: CCIN was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: CCIN were set to 36546111; 36527329
Phenotypes for gene: CCIN were set to Teratozoospermia
Review for gene: CCIN was set to GREEN
gene: CCIN was marked as current diagnostic
Added comment: Two papers with three unrelated patients with teratozoospermia:

PMID: 36546111
- Two families reported: One with homozygous missense (fam is consanguineous) and another with compound heterozygous missense + nonsense variants, patients suffering from teratozoospermia.
- Homozygous CcinH42L/H42L and compound heterozygous CcinR432W/C447* knock-in mice generated. Spermatozoa from homozygous male mice exhibited abnormalities of sperm head shape revealed by Diff-Quick staining. When mated with WT mice, both homozygous CcinH42L/H42L and compound heterozygous CcinR432W/C447* male mice were infertile, whereas the mutant female mice could generate offspring and displayed no defects in fertility.

PMID: 36527329
- One consanguineous family reported: homozygous missense, with asthenoteratozoospermia.
- Transfected HEK cells showed reduced CCIN protein level.
Sources: Literature
Mendeliome v1.477 CLEC3B Chirag Patel gene: CLEC3B was added
gene: CLEC3B was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: CLEC3B was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Publications for gene: CLEC3B were set to PMID: 35331648
Phenotypes for gene: CLEC3B were set to Macular dystrophy, retinal, 4, OMIM #619977
Review for gene: CLEC3B was set to GREEN
Added comment: 12 affected individuals from 5 multigenerational Japanese families in a small village in Miyazaki diagnosed with autosomal dominant maculoretinopathy. WES identified a pathogenic variant (p.Ala180Asp) in CLEC3B, which encodes tetranectin, a plasminogen kringle-4 binding protein. Variant cosegregated with the ocular phenotype.

Mice that received subretinal injections with CLEC3B variant displayed multiple subretinal hyperreflective deposits, reduced retinal thickness, and decreased electroretinographic responses. The optokinetic tracking response indicated that spatial frequency was significantly lower (P < .05), implying impaired visual function in the mice.
Sources: Literature
Mendeliome v1.264 COL9A3 Zornitza Stark Phenotypes for gene: COL9A3 were changed from Epiphyseal dysplasia, multiple, 3, with or without myopathy, MIM# 600969; Stickler syndrome AR; Deafness AD; Peripheral vitreoretinal degeneration and retinal detachment, AD to Epiphyseal dysplasia, multiple, 3, with or without myopathy, MIM# 600969; Stickler syndrome, type VI, MIM# 620022; Deafness AD; Peripheral vitreoretinal degeneration and retinal detachment, AD
Mendeliome v1.263 COL9A3 Zornitza Stark edited their review of gene: COL9A3: Changed phenotypes: Epiphyseal dysplasia, multiple, 3, with or without myopathy, MIM# 600969, Stickler syndrome, type VI, MIM# 620022, Deafness
Mendeliome v1.35 GIMAP6 Elena Savva gene: GIMAP6 was added
gene: GIMAP6 was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: GIMAP6 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: GIMAP6 were set to PMID: 35551368; 33328581
Phenotypes for gene: GIMAP6 were set to Autophagy, immune competence and inflammation
Review for gene: GIMAP6 was set to AMBER
Added comment: PMID: 35551368, PMID: 33328581
- K/O mice show autophagy, redox regulation, and polyunsaturated fatty acid (PUFA)–containing lipids and die prematurely from microangiopathic glomerulosclerosis with immunodeficiency.
- 2 unrelated families (3 patients) w/ a homozygous missense (p.Gly153Val) and nonsense (p.Trp86*). All unaffected siblings were heterozygous.
Patient 1 (missense) presented with Coombs-positive hemolytic anemia, hepatosplenomegaly, Cranial MRI showed bilateral effusions, sulcal hyperintensity, and lateral parietal subcortical acute focal ischemic lesions.
Patient 2 (nonsense) presented with recurrent purulent otitis media and a chronic wet cough, persistent jaundice, recurrent chest and ear infections, lingular consolidation, mild bronchiectasis, bibasilar bronchial wall thickening, right peribronchial consolidation, right lower lobe bronchiectasis, bilateral axillary lymphadenopathy, and splenomegaly.
Patient 3 (nonsense) presented with suffered headaches, abdomen pain, mouth ulcers, and recurrent infections

- Functional studies show patient 1 (missense) with reduced protein expression on western blot, and patient 2/3 (nonsense) with no protein expression. T cells of Pt 1 were similar to mouse K/O model (elevated basal LC3-II, reduced autophagic flux).

gnomAD: 0 homozygous PTCs, but a very common canonical splice which is present in the non-canonical transcript
Sources: Literature
Mendeliome v1.7 PROSER1 Zornitza Stark gene: PROSER1 was added
gene: PROSER1 was added to Mendeliome. Sources: Expert Review
founder tags were added to gene: PROSER1.
Mode of inheritance for gene: PROSER1 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: PROSER1 were set to 35229282
Phenotypes for gene: PROSER1 were set to Syndromic disease MONDO:0002254, PROSER1-related
Review for gene: PROSER1 was set to RED
Added comment: 4 children from 3 related families with developmental delay, hypotonia, seizures, failure-to-thrive, strabismus, drooling, recurrent otitis media, hearing impairment, genitourinary malformations, and common facial features (arched eyebrows, prominent eyes, broad nasal bridge, low-hanging columella, open mouth, thick lower lip, protruding tongue, large low-set ears, and parietal bossing). WES revealed a homozygous frame-shift variant (p.Thr612Glnfs*22) in PROSER1. This encodes the proline and serine rich protein 1, part of the histone methyltransferases KMT2C/KMT2D complexes. PROSER1 stabilizes TET2, a member of the TET family of DNA demethylases which is involved in recruiting the enhancer-associated KMT2C/KMT2D complexes and mediating DNA demethylation, activating gene expression. Therefore, PROSER1 may play vital and potentially general roles in gene regulation. No functional assays and 3 related families, likely founder effect.
Sources: Expert Review
Mendeliome v0.13956 DMP1 Ain Roesley Phenotypes for gene: DMP1 were changed from to Hypophosphatemic rickets MIM#241520
Mendeliome v0.13955 DMP1 Ain Roesley reviewed gene: DMP1: Rating: GREEN; Mode of pathogenicity: None; Publications: 32920683, 17033625, 17033621; Phenotypes: Hypophosphatemic rickets MIM#241520; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal; Current diagnostic: yes
Mendeliome v0.13930 CYP27B1 Ain Roesley Phenotypes for gene: CYP27B1 were changed from to Vitamin D-dependent rickets, type I MIM#264700
Mendeliome v0.13928 CYP27B1 Ain Roesley reviewed gene: CYP27B1: Rating: GREEN; Mode of pathogenicity: None; Publications: 9486994, 9415400, 12050193, 27473561, 34492747, 33823104; Phenotypes: Vitamin D-dependent rickets, type I MIM#264700; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal; Current diagnostic: yes
Mendeliome v0.13923 CYP2R1 Ain Roesley Phenotypes for gene: CYP2R1 were changed from to Rickets due to defect in vitamin D 25-hydroxylation deficiency MIM#600081
Mendeliome v0.13922 CYP2R1 Ain Roesley reviewed gene: CYP2R1: Rating: GREEN; Mode of pathogenicity: None; Publications: 15128933, 28548312; Phenotypes: Rickets due to defect in vitamin D 25-hydroxylation deficiency MIM#600081; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal; Current diagnostic: yes
Mendeliome v0.13792 CD164 Alison Yeung gene: CD164 was added
gene: CD164 was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: CD164 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Publications for gene: CD164 were set to 26197441; 35254497; 26197441
Phenotypes for gene: CD164 were set to Deafness, autosomal dominant 66, MIM# 616969
Review for gene: CD164 was set to GREEN
Added comment: p.(Arg192Ter), a truncating variant that results in loss of 6 amino acids, was detected in two families (one Polish and one Korean) with hearing loss. Four affected (heterozygous) and two unaffected (neg) were tested, however 14 members had been diagnosed with HL in a large multi generational family (gene panel 237 genes). The second family (WES) had two affected heterozygous and no unaffected were tested. This same variant had previously been reported in a Danish family (12 affected heterozygous and 13 unaffected negative, but one younger member unaffected are heterozygous) with hearing loss (PMID: 26197441), for which functional studies in HEK cells demonstrated that the truncated protein was almost completely retained on the plasma cell membrane in contrast to the wild-type protein, which targeted primarily to the endo-lysosomal compartments. The YHTL motif, deleted by the c.574C>T nonsense mutation, is a canonical sorting motif
known to be recognized by specific adaptor proteins in the cytosol, leading to subcellular trafficking of the transmembrane protein to endosomes and lysosomes.
Sources: Literature
Mendeliome v0.13687 COL9A1 Ain Roesley Phenotypes for gene: COL9A1 were changed from to Stickler syndrome, type IV, MIM# 614134
Mendeliome v0.13685 COL9A1 Ain Roesley reviewed gene: COL9A1: Rating: GREEN; Mode of pathogenicity: None; Publications: 16909383, 21421862, 31090205; Phenotypes: Stickler syndrome, type IV, MIM# 614134; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal; Current diagnostic: yes
Mendeliome v0.13675 COL9A2 Ain Roesley Phenotypes for gene: COL9A2 were changed from to Stickler syndrome, type V MIM#614284' Epiphyseal dysplasia, multiple, 2 MIM#600204
Mendeliome v0.13674 COL9A2 Ain Roesley reviewed gene: COL9A2: Rating: GREEN; Mode of pathogenicity: None; Publications: 21671392, 31090205, 33356723, 10364514, 15633184, 20358595, 8528240; Phenotypes: Stickler syndrome, type V MIM#614284' Epiphyseal dysplasia, multiple, 2 MIM#600204; Mode of inheritance: BOTH monoallelic and biallelic, autosomal or pseudoautosomal; Current diagnostic: yes
Mendeliome v0.13647 COL11A2 Ain Roesley Phenotypes for gene: COL11A2 were changed from to Stickler syndrome type 3; Deafness, autosomal dominant 13 MIM#601868; Deafness, autosomal recessive 53 MIM#609706; Fibrochondrogenesis 2 MIM#614524; Otospondylomegaepiphyseal dysplasia, autosomal dominant MIM#184840; Otospondylomegaepiphyseal dysplasia, autosomal recessive MIM#215150
Mendeliome v0.13645 COL11A2 Ain Roesley reviewed gene: COL11A2: Rating: GREEN; Mode of pathogenicity: None; Publications: 10581026, 25633957, 16033917, 25240749, 22796475, 20112039; Phenotypes: Stickler syndrome type 3, Deafness, autosomal dominant 13 MIM#601868, Deafness, autosomal recessive 53 MIM#609706, Fibrochondrogenesis 2 MIM#614524, Otospondylomegaepiphyseal dysplasia, autosomal dominant MIM#184840, Otospondylomegaepiphyseal dysplasia, autosomal recessive MIM#215150; Mode of inheritance: BOTH monoallelic and biallelic, autosomal or pseudoautosomal; Current diagnostic: yes
Mendeliome v0.13297 PDGFRA Krithika Murali changed review comment from: ?Suitability for Incidentalome versus Mendeliome based on adult age of diagnosis in reported cases.

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Six unrelated families reported with heterozygous germline variants associated with familial GIST and/or inflammatory fibroid polyps - IFP (benign lesions caused by excessive tissue proliferation and inflammatory cell infiltration into the lumen of the GI tract). Note that reported individuals diagnosed as adults. One individual reported with diagnosis of gastric mass/polyps age 22 (in 1977) raising the possibility of pre-symptomatic disease onset in adolescence. Green PanelApp England in the following panels: tumour predisposition - childhood onset; inherited predisposition to GIST; sarcoma cancer susceptibility.

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PMID 34107389 Hodan et al 2021 - report a 35 yo F with jejunal IFP and a heterozygous germline missense PDGFRA variant (c.1664A>G p.Y555C) . The variant segregated with 3 relatives with confirmed IFPs. Two obligate carriers were reported to have had a similar phenotype while at least one obligate male carrier had no reported history of IFPs. This variant was also reported in an unrelated family with multiple IFPs in 2006.

PMID 29486293 Manley et al 2018 - proband is a 50 yo M with multiple ileal intusussceptions and IFPs and GIST. Heterozygous D846V germline variant identified. Variant identified in daughter and 2 siblings. Coarser face, coarser skin, broader hands and feet, unexplained premature loss of teeth requiring dentures in their 40s described in relatives with the variant, no polyps or tumour identified in screened family members. Pdgfra +/K mutant mice recapitulated the human phenotype. Mice with the constitutively activated mutant PDGFRA shown to have diffuse expansion of the gastrointestinal submucosa, which exhibits an increased number of spindled fibroblast-like cells and marked collagen deposition. Mutant mice also develop intestinal polyps morphologically similar to IFPs. The Pdgfra +/K mice also exhibit thickened skin due to excess collagen deposition within the dermis and subcutaneous tissues.

PMID 25975287 Ricci et al 2015 - report a family with het germline P653L PDGFRA missense variant. The proband was a 67 yo M with multiple intra-abdominal GIST and gastric/colonic inflammatory fibroid polyps. Multiple adult relatives (youngest age 31) were diagnosed with IFPs/fibrous tumours with the variant segregating with disease.

PMID: 18670346 Carney et al 2008 and PMID: 17566086 Pasini et al 2007 - heterozygous germline PDGFRA mutation (V561D) in an individual with GIST and multiple polyps, diagnosed initially aged 22 with multiple GIST/polyps. No other relatives available for genotyping and no other significant family history reported.

PMID: 17087943 de Raedt et al 2006 - heterozygous PDGFRA(Y555C) variant reported in a family with multiple relatives affected by IFP, including one death from secondary bowel obstruction age 35.

PMID: 14699510 Chompret et al 2004 - Heterozygous c.2675G>T D846Y germline variant detected in a French family with 5 relatives developing adult-onset GIST, variant segregated with disease.

--

Gain of function somatic variants associated with sporadic GIST. Somatic chromosomal rearrangements resulting in PDGFRA and FIP1L1 gene fusion associated with idiopathic hypereosinophilic syndrome.; to: Six unrelated families reported with heterozygous germline variants associated with familial GIST and/or inflammatory fibroid polyps - IFP (benign lesions caused by excessive tissue proliferation and inflammatory cell infiltration into the lumen of the GI tract). Note that reported individuals diagnosed as adults. One individual reported with diagnosis of gastric mass/polyps age 22 (in 1977) raising the possibility of pre-symptomatic disease onset in adolescence. Green PanelApp England in the following panels: tumour predisposition - childhood onset; inherited predisposition to GIST; sarcoma cancer susceptibility.

---

PMID 34107389 Hodan et al 2021 - report a 35 yo F with jejunal IFP and a heterozygous germline missense PDGFRA variant (c.1664A>G p.Y555C) . The variant segregated with 3 relatives with confirmed IFPs. Two obligate carriers were reported to have had a similar phenotype while at least one obligate male carrier had no reported history of IFPs. This variant was also reported in an unrelated family with multiple IFPs in 2006.

PMID 29486293 Manley et al 2018 - proband is a 50 yo M with multiple ileal intusussceptions and IFPs and GIST. Heterozygous D846V germline variant identified. Variant identified in daughter and 2 siblings. Coarser face, coarser skin, broader hands and feet, unexplained premature loss of teeth requiring dentures in their 40s described in relatives with the variant, no polyps or tumour identified in screened family members. Pdgfra +/K mutant mice recapitulated the human phenotype. Mice with the constitutively activated mutant PDGFRA shown to have diffuse expansion of the gastrointestinal submucosa, which exhibits an increased number of spindled fibroblast-like cells and marked collagen deposition. Mutant mice also develop intestinal polyps morphologically similar to IFPs. The Pdgfra +/K mice also exhibit thickened skin due to excess collagen deposition within the dermis and subcutaneous tissues.

PMID 25975287 Ricci et al 2015 - report a family with het germline P653L PDGFRA missense variant. The proband was a 67 yo M with multiple intra-abdominal GIST and gastric/colonic inflammatory fibroid polyps. Multiple adult relatives (youngest age 31) were diagnosed with IFPs/fibrous tumours with the variant segregating with disease.

PMID: 18670346 Carney et al 2008 and PMID: 17566086 Pasini et al 2007 - heterozygous germline PDGFRA mutation (V561D) in an individual with GIST and multiple polyps, diagnosed initially aged 22 with multiple GIST/polyps. No other relatives available for genotyping and no other significant family history reported.

PMID: 17087943 de Raedt et al 2006 - heterozygous PDGFRA(Y555C) variant reported in a family with multiple relatives affected by IFP, including one death from secondary bowel obstruction age 35.

PMID: 14699510 Chompret et al 2004 - Heterozygous c.2675G>T D846Y germline variant detected in a French family with 5 relatives developing adult-onset GIST, variant segregated with disease.

--

Gain of function somatic variants associated with sporadic GIST. Somatic chromosomal rearrangements resulting in PDGFRA and FIP1L1 gene fusion associated with idiopathic hypereosinophilic syndrome.
Mendeliome v0.13149 FGF23 Bryony Thompson Phenotypes for gene: FGF23 were changed from to autosomal dominant hypophosphatemic rickets MONDO:0008660; familial hyperphosphatemic tumoral calcinosis/hyperphosphatemic hyperostosis syndrome MONDO:0100251
Mendeliome v0.13143 FGF23 Bryony Thompson reviewed gene: FGF23: Rating: GREEN; Mode of pathogenicity: Other; Publications: 11062477, 14966565, 15590700, 16151858, 16030159, 25378588, 34444516; Phenotypes: autosomal dominant hypophosphatemic rickets MONDO:0008660, familial hyperphosphatemic tumoral calcinosis/hyperphosphatemic hyperostosis syndrome MONDO:0100251; Mode of inheritance: BOTH monoallelic and biallelic, autosomal or pseudoautosomal; Current diagnostic: yes
Mendeliome v0.13011 PRICKLE2 Zornitza Stark Phenotypes for gene: PRICKLE2 were changed from Neurodevelopmental disorder, global developmental delay, behavioural difficulties ± epilepsy, autistic features, and attention deficit hyperactive disorder. to Neurodevelopmental disorder, MONDO:0700092; global developmental delay, behavioural difficulties ± epilepsy, autistic features, and attention deficit hyperactive disorder.
Mendeliome v0.13010 PRICKLE1 Zornitza Stark Marked gene: PRICKLE1 as ready
Mendeliome v0.13010 PRICKLE1 Zornitza Stark Gene: prickle1 has been classified as Green List (High Evidence).
Mendeliome v0.13010 PRICKLE1 Zornitza Stark Phenotypes for gene: PRICKLE1 were changed from to Epilepsy, progressive myoclonic 1B, MIM# 612437
Mendeliome v0.13009 PRICKLE1 Zornitza Stark Publications for gene: PRICKLE1 were set to
Mendeliome v0.13008 PRICKLE1 Zornitza Stark Mode of inheritance for gene: PRICKLE1 was changed from Unknown to BOTH monoallelic and biallelic, autosomal or pseudoautosomal
Mendeliome v0.13007 PRICKLE1 Zornitza Stark reviewed gene: PRICKLE1: Rating: GREEN; Mode of pathogenicity: None; Publications: 34597683, 30564977, 30345727, 29790814, 26727662, 31035234; Phenotypes: Epilepsy, progressive myoclonic 1B, MIM# 612437; Mode of inheritance: BOTH monoallelic and biallelic, autosomal or pseudoautosomal
Mendeliome v0.12667 SLC2A2 Zornitza Stark changed review comment from: Fanconi-Bickel syndrome is a rare but well-defined clinical entity, inherited in an autosomal recessive mode and characterized by hepatorenal glycogen accumulation, proximal renal tubular dysfunction, and impaired utilization of glucose and galactose.

> 5 patients previously reported with the associated condition, which is a glycogen storage disease. SLC2A2 encodes for the glucose transporter, GLUT2.; to: Fanconi-Bickel syndrome is characterized by hepatorenal glycogen accumulation, proximal renal tubular dysfunction, and impaired utilization of glucose and galactose.

> 5 patients previously reported with the associated condition, which is a glycogen storage disease. SLC2A2 encodes for the glucose transporter, GLUT2.
Mendeliome v0.12667 SLC2A2 Zornitza Stark Phenotypes for gene: SLC2A2 were changed from to Fanconi-Bickel syndrome, MIM# 227810
Mendeliome v0.12664 SLC2A2 Zornitza Stark reviewed gene: SLC2A2: Rating: GREEN; Mode of pathogenicity: None; Publications: 30950137, 22145468; Phenotypes: Fanconi-Bickel syndrome, MIM# 227810; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal
Mendeliome v0.11606 ENPP1 Zornitza Stark Phenotypes for gene: ENPP1 were changed from to Arterial calcification, generalized, of infancy, 1, MIM# 208000; Cole disease, MIM# 615522; Hypophosphatemic rickets, autosomal recessive, 2, MIM# 613312
Mendeliome v0.11603 ENPP1 Zornitza Stark reviewed gene: ENPP1: Rating: GREEN; Mode of pathogenicity: None; Publications: 24075184, 26617416, 28964717, 32598042, 35220637, 12881724, 15605415, 33005041, 20016754, 20137773, 20137772; Phenotypes: Arterial calcification, generalized, of infancy, 1, MIM# 208000, Cole disease, MIM# 615522, Hypophosphatemic rickets, autosomal recessive, 2, MIM# 613312; Mode of inheritance: BOTH monoallelic and biallelic, autosomal or pseudoautosomal
Mendeliome v0.11581 VDR Zornitza Stark Phenotypes for gene: VDR were changed from to Rickets, vitamin D-resistant, type IIA, MIM# 277440
Mendeliome v0.11578 VDR Zornitza Stark reviewed gene: VDR: Rating: GREEN; Mode of pathogenicity: None; Publications: 2849209, 9005998, 17970811; Phenotypes: Rickets, vitamin D-resistant, type IIA, MIM# 277440; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal
Mendeliome v0.10836 TMEM53 Lucy Spencer gene: TMEM53 was added
gene: TMEM53 was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: TMEM53 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: TMEM53 were set to PMID: 33824347
Phenotypes for gene: TMEM53 were set to Sclerosing bone disorder, macrocephaly, impaired vision, short stature
Review for gene: TMEM53 was set to GREEN
Added comment: PMID: 33824347- Previously unknown type of sclerosing bone disorder in 4 independent families, bi-allelic LOF variants in TMEM53. 5 individuals from 4 families, all have proportional or short limbed stature, not identifiable at birth. Head deformities (macrocephaly, dolichocephaly, prominent forehead), epicanthic folds, thick vermilion of upper and lower lips. Vision diminished after early childhood due to optic nerve compression.

3 of 4 families confirmed consanguineous, and all affected members from all 4 families have homozygous variants inherited from heterozygous parents. 3 families have the same splicing variant proven to cause exon 2 skipping and an NMD frameshift by RT-PCR. The other family has a an NMD frameshift variant. So 4 families but only 2 variants.
Sources: Literature
Mendeliome v0.10643 TBX22 Zornitza Stark Phenotypes for gene: TBX22 were changed from to Cleft palate with ankyloglossia, MIM# 303400; Abruzzo-Erickson syndrome, MIM# 302905
Mendeliome v0.10640 TBX22 Zornitza Stark reviewed gene: TBX22: Rating: GREEN; Mode of pathogenicity: None; Publications: 11559848, 12374769, 14729838, 17868388, 22784330, 22784330; Phenotypes: Cleft palate with ankyloglossia, MIM# 303400, Abruzzo-Erickson syndrome, MIM# 302905; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females
Mendeliome v0.10204 NPC1 Daniel Flanagan gene: NPC1 was added
gene: NPC1 was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: NPC1 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: NPC1 were set to 12408188; 9211849
Phenotypes for gene: NPC1 were set to Niemann-Pick disease, type C1/ type D (MIM#257220)
Review for gene: NPC1 was set to GREEN
Added comment: Biallelic NPC1 variants cause Niemann-Pick disease, type C1/ type D. Prenatal manifestation: hydrops fetalis.
Sources: Literature
Mendeliome v0.10044 ECM1 Zornitza Stark changed review comment from: PMID: 11929856 - Hamada et al 2002 - looked at 6 different unrelated consanguineous families (from Saudi Arabia, Kuwait, Pakistan, The Netherlands, UK, and a group of South African families with a probable common ancestor) with a clinical diagnosis of Lipoid proteinosis (LP)/Urbach–Wiethe disease. They performed a genome-wide linkage analysis and identified a region and then looked at the expression of candidate genes in fibroblasts from patients compared to controls. ECM1 was found to have lower expression levels. 6 homozygous deletion variants were identified in the patients. In one family they established that the parents were heterozygous for the variant.

PMID: 28720532 - Afifi et al 2017 - studied 12 patients from 10 unrelated consanguineous Egyptian families with a clinical diagnosis of lipoid proteinosis. The patients reported progressive hoarseness of voice and easily damaged skin by minor trauma or friction. Homozygous ECM1 variants were detected in affected members in all families: 1 family had a missense variant, 5 families had splice site variants and 4 families had indels predicted to cause frameshifts. Parents were found to be heterozygous for the variants.

PMID: 33159951 - Zhu et al 2021 - a novel homozygous three-nucleotide duplication (c.506_508dupCTG) in ECM in two siblings affected with LP from a consanguineous Chinese family.; to: Lipoid proteinosis of Urbach and Wiethe is a rare autosomal recessive disorder typified by generalized thickening of skin, mucosae, and certain viscera. Classic features include beaded eyelid papules and laryngeal infiltration leading to hoarseness. The disorder is clinically heterogeneous, with affected individuals displaying differing degrees of skin scarring and infiltration, variable signs of hoarseness and respiratory distress, and in some cases neurologic abnormalities such as temporal lobe epilepsy. Histologically, there is widespread deposition of hyaline (glycoprotein) material and disruption/reduplication of basement membrane

PMID: 11929856 - Hamada et al 2002 - looked at 6 different unrelated consanguineous families (from Saudi Arabia, Kuwait, Pakistan, The Netherlands, UK, and a group of South African families with a probable common ancestor) with a clinical diagnosis of Lipoid proteinosis (LP)/Urbach–Wiethe disease. They performed a genome-wide linkage analysis and identified a region and then looked at the expression of candidate genes in fibroblasts from patients compared to controls. ECM1 was found to have lower expression levels. 6 homozygous deletion variants were identified in the patients. In one family they established that the parents were heterozygous for the variant.

PMID: 28720532 - Afifi et al 2017 - studied 12 patients from 10 unrelated consanguineous Egyptian families with a clinical diagnosis of lipoid proteinosis. The patients reported progressive hoarseness of voice and easily damaged skin by minor trauma or friction. Homozygous ECM1 variants were detected in affected members in all families: 1 family had a missense variant, 5 families had splice site variants and 4 families had indels predicted to cause frameshifts. Parents were found to be heterozygous for the variants.

PMID: 33159951 - Zhu et al 2021 - a novel homozygous three-nucleotide duplication (c.506_508dupCTG) in ECM in two siblings affected with LP from a consanguineous Chinese family.
Mendeliome v0.9085 PRICKLE2 Zornitza Stark Marked gene: PRICKLE2 as ready
Mendeliome v0.9085 PRICKLE2 Zornitza Stark Gene: prickle2 has been classified as Green List (High Evidence).
Mendeliome v0.9085 PRICKLE2 Zornitza Stark Phenotypes for gene: PRICKLE2 were changed from to Neurodevelopmental disorder, global developmental delay, behavioural difficulties ± epilepsy, autistic features, and attention deficit hyperactive disorder.
Mendeliome v0.9084 PRICKLE2 Zornitza Stark Publications for gene: PRICKLE2 were set to
Mendeliome v0.9083 PRICKLE2 Zornitza Stark Mode of inheritance for gene: PRICKLE2 was changed from Unknown to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Mendeliome v0.9082 PRICKLE2 Hazel Phillimore reviewed gene: PRICKLE2: Rating: GREEN; Mode of pathogenicity: None; Publications: PMID: 34092786; Phenotypes: Neurodevelopmental disorder, global developmental delay, behavioural difficulties ± epilepsy, autistic features, and attention deficit hyperactive disorder.; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Mendeliome v0.9021 CHRM1 Bryony Thompson gene: CHRM1 was added
gene: CHRM1 was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: CHRM1 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Publications for gene: CHRM1 were set to 34212451; 31981491; 12483218
Phenotypes for gene: CHRM1 were set to Neurodevelopmental delay; intellectual disability; autism
Review for gene: CHRM1 was set to AMBER
Added comment: PMID: 34212451 - 2 unrelated cases with de novo missense variants (p.Pro380Leu and p.Phe425Ser), one case with early-onset refractory epilepsy, severe disability, and progressive cerebral and cerebellar atrophy, and the second case with mild dysmorphism, global developmental delay, and moderate intellectual disability. In vitro biochemical analyses of p.Pro380Leu demonstrated a reduction in protein levels, impaired cellular trafficking, and defective activation of intracellular signaling pathways.
PMID: 31981491 - an autism spectrum disorder (no other information on phenotype, except ascertained to have severe neurodevelopmental delay) case with a de novo missense variant p.(Arg210Leu)
PMID: 12483218 - null mouse model assessing memory demonstrated selective cognitive dysfunction.
Sources: Literature
Mendeliome v0.8807 VPS50 Zornitza Stark gene: VPS50 was added
gene: VPS50 was added to Mendeliome. 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
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.
Sources: Literature
Mendeliome v0.8384 ICK Zornitza Stark Marked gene: ICK as ready
Mendeliome v0.8384 ICK Zornitza Stark Gene: ick has been classified as Green List (High Evidence).
Mendeliome v0.8384 ICK Zornitza Stark Phenotypes for gene: ICK were changed from to Endocrine-cerebroosteodysplasia (MIM#612651)
Mendeliome v0.8383 ICK Zornitza Stark Publications for gene: ICK were set to
Mendeliome v0.8382 ICK Zornitza Stark Mode of inheritance for gene: ICK was changed from Unknown to BIALLELIC, autosomal or pseudoautosomal
Mendeliome v0.8198 MKKS Zornitza Stark Phenotypes for gene: MKKS were changed from to Bardet-Biedl syndrome 6 (MIM#605231); McKusick-Kaufman syndrome, MIM# 236700; Retinitis pigmentosa
Mendeliome v0.8195 MKKS Zornitza Stark reviewed gene: MKKS: Rating: GREEN; Mode of pathogenicity: None; Publications: 10802661, 26900326, 10973251; Phenotypes: Bardet-Biedl syndrome 6 (MIM#605231), McKusick-Kaufman syndrome, MIM# 236700, Retinitis pigmentosa; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal
Mendeliome v0.8155 SLC34A3 Zornitza Stark Phenotypes for gene: SLC34A3 were changed from to Hypophosphatemic rickets with hypercalciuria, (MIM#241530)
Mendeliome v0.8145 SLC34A3 Ain Roesley reviewed gene: SLC34A3: Rating: GREEN; Mode of pathogenicity: None; Publications: 32524022; Phenotypes: Hypophosphatemic rickets with hypercalciuria, (MIM#241530); Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal
Mendeliome v0.7926 COL9A3 Zornitza Stark Phenotypes for gene: COL9A3 were changed from Epiphyseal dysplasia, multiple, 3, with or without myopathy, MIM# 600969; Stickler syndrome; Deafness to Epiphyseal dysplasia, multiple, 3, with or without myopathy, MIM# 600969; Stickler syndrome AR; Deafness AD; Peripheral vitreoretinal degeneration and retinal detachment, AD
Mendeliome v0.7905 PLG Zornitza Stark changed review comment from: Association between mono-allelic variants and HAE: Over 20 families reported with a recurrent variant, p.Lys330Glu. Single family reported with a different variant. Note bi-allelic variants are associated with a separate disorder.

Bi-allelic variants and plasminogen deficiency: congenital plasminogen deficiency is characterised clinically by chronic mucosal pseudomembranous lesions consisting of subepithelial fibrin deposition and inflammation. The most common clinical manifestation is ligneous ('wood-like') conjunctivitis, a redness and subsequent formation of pseudomembranes mostly on the palpebral surfaces of the eye that progress to white, yellow-white, or red thick masses with a wood-like consistency that replace the normal mucosa. The lesions may be triggered by local injury and/or infection and often recur after local excision. Pseudomembranous lesions of other mucous membranes often occur in the mouth, nasopharynx, trachea, and female genital tract. Some affected children also have congenital occlusive hydrocephalus. At least 3 unrelated families reported.; to: Association between mono-allelic variants and HAE: Over 20 families reported with a recurrent variant, p.Lys330Glu. Single family reported with a different variant. Note bi-allelic variants are associated with a separate disorder.

Bi-allelic variants and plasminogen deficiency: congenital plasminogen deficiency is characterised clinically by chronic mucosal pseudomembranous lesions consisting of subepithelial fibrin deposition and inflammation. The most common clinical manifestation is ligneous ('wood-like') conjunctivitis, a redness and subsequent formation of pseudomembranes mostly on the palpebral surfaces of the eye that progress to white, yellow-white, or red thick masses with a wood-like consistency that replace the normal mucosa. The lesions may be triggered by local injury and/or infection and often recur after local excision. Pseudomembranous lesions of other mucous membranes often occur in the mouth, nasopharynx, trachea, and female genital tract. Some affected children also have congenital occlusive hydrocephalus. Over 20 unrelated families reported.
Mendeliome v0.7891 COL9A3 Kristin Rigbye reviewed gene: COL9A3: Rating: GREEN; Mode of pathogenicity: None; Publications: 33633367; Phenotypes: Epiphyseal dysplasia, multiple, 3, with or without myopathy, AD, MIM# 600969, Stickler syndrome, AR, Deafness, AD, Peripheral vitreoretinal degeneration and retinal detachment, AD; Mode of inheritance: BOTH monoallelic and biallelic, autosomal or pseudoautosomal
Mendeliome v0.7166 SMPD1 Zornitza Stark changed review comment from: Well established gene-disease association.; to: Niemann-Pick disease (NPD) refers to a group of disorders that present with varying degrees of lipid storage and foam cell infiltration in tissues, as well as overlapping clinical features including hepatosplenomegaly, pulmonary insufficiency and/or central nervous system (CNS) involvement. Type A NPD patients exhibit hepatosplenomegaly in infancy and profound CNS involvement. They rarely survive beyond 2-3years of age. Type B patients also have hepatosplenomegaly and pathologic alterations of their lungs, but there are usually no CNS signs. The age of onset and rate of disease progression varies greatly among type B patients, and they frequently live into adulthood. Intermediate patients also have been reported with mild to moderate neurological findings.

Well established gene-disease association.
Mendeliome v0.7166 SMPD1 Zornitza Stark Phenotypes for gene: SMPD1 were changed from to Niemann-Pick disease, type A, MIM# 257200; MONDO:0009756; Niemann-Pick disease, type B, MIM# 607616; MONDO:0011871
Mendeliome v0.7163 SMPD1 Zornitza Stark reviewed gene: SMPD1: Rating: GREEN; Mode of pathogenicity: None; Publications: 32292456, 32280632, 28164782; Phenotypes: Niemann-Pick disease, type A, MIM# 257200, MONDO:0009756, Niemann-Pick disease, type B, MIM# 607616, MONDO:0011871; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal
Mendeliome v0.6544 COL9A3 Zornitza Stark Phenotypes for gene: COL9A3 were changed from to Epiphyseal dysplasia, multiple, 3, with or without myopathy, MIM# 600969; Stickler syndrome; Deafness
Mendeliome v0.6541 COL9A3 Zornitza Stark reviewed gene: COL9A3: Rating: GREEN; Mode of pathogenicity: None; Publications: 30450842, 31090205, 24273071, 10090888, 15551337; Phenotypes: Epiphyseal dysplasia, multiple, 3, with or without myopathy, MIM# 600969, Stickler syndrome, Deafness; Mode of inheritance: BOTH monoallelic and biallelic, autosomal or pseudoautosomal
Mendeliome v0.6531 PERP Zornitza Stark edited their review of gene: PERP: Added comment: Four families reported with heterozygous variants and Olmsted syndrome-2 (OLMS2), which is characterised by mutilating hyperkeratotic skin lesions, primarily on the palms and soles, but also extending onto dorsal surfaces of the hands and feet and distal extremities. The lesions are progressive, becoming thicker with verrucous fissures on the palms and soles over time. In addition, affected individuals exhibit perioral hyperkeratosis, and may have lesions around other orifices as well, such as the nostrils, perineum, and anus. Most patients also have hyperkeratotic nails and light-colored woolly hair.

Two families reported with bi-allelic variants and Erythrokeratodermia variabilis et progressiva-7 (EKVP7), which is characterised by palmoplantar keratoderma that extends to the dorsal surface of the hands and feet (transgrediens), as well as erythematous annular skin lesions. Pruritis, woolly hair, and dystrophic nails may also be present.; Changed rating: GREEN; Changed publications: 31898316, 30321533, 31361044; Changed phenotypes: Olmsted syndrome 2, MIM# 619208, Erythrokeratodermia variabilis et progressiva 7, MIM# 619209; Changed mode of inheritance: BOTH monoallelic and biallelic, autosomal or pseudoautosomal
Mendeliome v0.6320 FSTL5 Eleanor Williams gene: FSTL5 was added
gene: FSTL5 was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: FSTL5 was set to Unknown
Publications for gene: FSTL5 were set to 33105483
Phenotypes for gene: FSTL5 were set to isolated club-foot; iTEV; Talipes equinovarus
Review for gene: FSTL5 was set to RED
Added comment: PMID: 33105483 - Khanshour et al 20201 - GWAS study of isolated Talipes equinovarus (clubfoot, iTEV) identified an associated locus within FSTL5. They show that Fstl5 is expressed in the embryonic hindlimb in bats, chicks and mice. However, Fstl5 was expressed more highly in neural tissues in mice, and rats lacking Fstl5 showed no gross developmental malformations. Conditional overexpression of Fstl5 in osteochondroprogenitors resulted in sexually dimorphic differences in skeletal development in mice.
Sources: Literature
Mendeliome v0.6167 ENO1 Kristin Rigbye gene: ENO1 was added
gene: ENO1 was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: ENO1 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Publications for gene: ENO1 were set to 32488097
Phenotypes for gene: ENO1 were set to Polymicrogyria
Review for gene: ENO1 was set to RED
Added comment: ENO1 identified as a polymicrogyria candidate gene from the smallest case of 1p36 duplication reported to date, in a 35yo F (onset at 8mo) presenting intellectual disability, microcephaly, epilepsy and perisylvian polymicrogyria. The duplication only encompassed 2 genes, ENO1 and RERE, and gene expression analysis performed using the patient cells revealed reduced expression, mimicking haploinsufficiency. Eno1 inactivation in rats was shown to cause a brain development defect. According to OMIM, ENO1 is deleted in glioblastoma, which is tolerated by the expression of ENO2.
Sources: Literature
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
Mendeliome v0.6119 FOXF1 Zornitza Stark changed review comment from: Congenital alveolar capillary dysplasia with misalignment of pulmonary veins (ACDMPV) is characterized histologically by failure of formation and ingrowth of alveolar capillaries that then do not make contact with alveolar epithelium, medial muscular thickening of small pulmonary arterioles with muscularization of the intraacinar arterioles, thickened alveolar walls, and anomalously situated pulmonary veins running alongside pulmonary arterioles and sharing the same adventitial sheath. Less common features include a reduced number of alveoli and a patchy distribution of the histopathologic changes. The disorder is associated with persistent pulmonary hypertension of the neonate and shows varying degrees of lability and severity. Affected infants present with respiratory distress resulting from pulmonary hypertension in the early postnatal period, and the disease is uniformly fatal within the newborn period. Additional features of ACDMPV include multiple congenital anomalies affecting the cardiovascular, gastrointestinal, genitourinary, and musculoskeletal systems, as well as disruption of the normal right-left asymmetry of intrathoracic or intraabdominal organs.; to: Congenital alveolar capillary dysplasia with misalignment of pulmonary veins (ACDMPV) is characterized histologically by failure of formation and ingrowth of alveolar capillaries that then do not make contact with alveolar epithelium, medial muscular thickening of small pulmonary arterioles with muscularization of the intraacinar arterioles, thickened alveolar walls, and anomalously situated pulmonary veins running alongside pulmonary arterioles and sharing the same adventitial sheath. Less common features include a reduced number of alveoli and a patchy distribution of the histopathologic changes. The disorder is associated with persistent pulmonary hypertension of the neonate and shows varying degrees of lability and severity. Affected infants present with respiratory distress resulting from pulmonary hypertension in the early postnatal period, and the disease is uniformly fatal within the newborn period. Additional features of ACDMPV include multiple congenital anomalies affecting the cardiovascular, gastrointestinal, genitourinary, and musculoskeletal systems, as well as disruption of the normal right-left asymmetry of intrathoracic or intraabdominal organs.

Over 50 families reported.
Mendeliome v0.6012 UBR7 Zornitza Stark gene: UBR7 was added
gene: UBR7 was added to Mendeliome. 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
Mendeliome v0.5799 LOXL3 Zornitza Stark gene: LOXL3 was added
gene: LOXL3 was added to Mendeliome. Sources: Expert Review
Mode of inheritance for gene: LOXL3 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: LOXL3 were set to 30362103; 25663169
Phenotypes for gene: LOXL3 were set to Stickler syndrome
Review for gene: LOXL3 was set to AMBER
Added comment: Two unrelated families reported with homozygous missense variants, mouse model supports gene-disease association.
Sources: Expert Review
Mendeliome v0.5671 MYH6 Zornitza Stark Phenotypes for gene: MYH6 were changed from to Atrial septal defect 3 MIM#614089; Congenital heart disease; Cardiomyopathy, dilated, 1EE MIM#613252; Cardiomyopathy, hypertrophic, 14 MIM#613251; {Sick sinus syndrome 3} MIM#614090
Mendeliome v0.5668 MYH6 Zornitza Stark reviewed gene: MYH6: Rating: GREEN; Mode of pathogenicity: None; Publications: 32656206, 31638415, 29969989, 29536580, 29332214, 30681346; Phenotypes: Atrial septal defect 3 MIM#614089, Congenital heart disease, Cardiomyopathy, dilated, 1EE MIM#613252, Cardiomyopathy, hypertrophic, 14 MIM#613251, {Sick sinus syndrome 3} MIM#614090; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Mendeliome v0.5665 MYH6 Elena Savva reviewed gene: MYH6: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Atrial septal defect 3 MIM#614089, Cardiomyopathy, dilated, 1EE MIM#613252, Cardiomyopathy, hypertrophic, 14 MIM#613251, {Sick sinus syndrome 3} MIM#614090; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown
Mendeliome v0.5567 VPS4A Kristin Rigbye changed review comment from: PMID: 33186543 - 2x de novo hetorozygous missense variants in the AAA (large ATPase) domain.
1x homozygous missense in the MIT domain (milder phenotype and unaffected parents).
Demonstrated defective CD71 trafficking in all 3 patients.

PMID: 33186545 - 6x probands with de novo missense variants in the AAA domain. 5 of the variants were at amino acid position 284 (changes to Trp and Gly).
Demonstrated that the variants had a dominant-negative effect on VPS4A function.
"The six probands with de novo substitutions affecting Glu206 or Arg284 had a consistent phenotype characterized by severe DD, profound ID, and dystonia. Children were very delayed in establishing head control and none achieved independent walking. Other common findings were cerebellar hypoplasia (five individuals out of six, the other showing uncharacterized severe cerebral atrophy) with a variable degree of corpus callosum hypoplasia. One individual also had bilateral polymicrogyria. Epilepsy was present in three and dystonia in five subjects. Eye involvement was also a common finding, including congenital cataract, retinal dystrophy, and in one case congenital Leber amaurosis. Four individuals were diagnosed with hepatosplenomegaly and/or steatosis. Three subjects had anemia, which was characterized as dyserythropoietic in two. Severe feeding difficulties were present in four individuals, requiring assisted feeding in three. Two had sensorineural deafness. Severe growth retardation, generally for all parameters, was present in most cases. Notably, severe microcephaly (typically with Z scores < −5) was universal. Overall, the disorder seems to have a poor prognosis as two affected individuals died in childhood or early adult life."
Sources: Literature; to: PMID: 33186543 - 2x de novo hetorozygous missense variants in the AAA (large ATPase) domain.
1x homozygous missense in the MIT domain (milder phenotype and unaffected parents - possibly just a simple LoF mechanism for AR inheritance).
Demonstrated defective CD71 trafficking in all 3 patients.

PMID: 33186545 - 6x probands with de novo missense variants in the AAA domain. 5 of the variants were at amino acid position 284 (changes to Trp and Gly).
Demonstrated that the variants had a dominant-negative effect on VPS4A function.

"The six probands with de novo substitutions affecting Glu206 or Arg284 had a consistent phenotype characterized by severe DD, profound ID, and dystonia. Children were very delayed in establishing head control and none achieved independent walking. Other common findings were cerebellar hypoplasia (five individuals out of six, the other showing uncharacterized severe cerebral atrophy) with a variable degree of corpus callosum hypoplasia. One individual also had bilateral polymicrogyria. Epilepsy was present in three and dystonia in five subjects. Eye involvement was also a common finding, including congenital cataract, retinal dystrophy, and in one case congenital Leber amaurosis. Four individuals were diagnosed with hepatosplenomegaly and/or steatosis. Three subjects had anemia, which was characterized as dyserythropoietic in two. Severe feeding difficulties were present in four individuals, requiring assisted feeding in three. Two had sensorineural deafness. Severe growth retardation, generally for all parameters, was present in most cases. Notably, severe microcephaly (typically with Z scores < −5) was universal. Overall, the disorder seems to have a poor prognosis as two affected individuals died in childhood or early adult life."
Mendeliome v0.5567 VPS4A Elena Savva changed review comment from: Comment when marking as ready: PMID: 33186543 - 2x de novo hetorozygous missense variants in the AAA (large ATPase) domain. 1x homozygous missense in the MIT domain (milder phenotype and unaffected parents). Demonstrated defective CD71 trafficking in all 3 patients. PMID: 33186545 - 6x probands with de novo missense variants in the AAA domain. 5 of the variants were at amino acid position 284 (changes to Trp and Gly). Demonstrated that the variants had a dominant-negative effect on VPS4A function. "The six probands with de novo substitutions affecting Glu206 or Arg284 had a consistent phenotype characterized by severe DD, profound ID, and dystonia. Children were very delayed in establishing head control and none achieved independent walking. Other common findings were cerebellar hypoplasia (five individuals out of six, the other showing uncharacterized severe cerebral atrophy) with a variable degree of corpus callosum hypoplasia. One individual also had bilateral polymicrogyria. Epilepsy was present in three and dystonia in five subjects. Eye involvement was also a common finding, including congenital cataract, retinal dystrophy, and in one case congenital Leber amaurosis. Four individuals were diagnosed with hepatosplenomegaly and/or steatosis. Three subjects had anemia, which was characterized as dyserythropoietic in two. Severe feeding difficulties were present in four individuals, requiring assisted feeding in three. Two had sensorineural deafness. Severe growth retardation, generally for all parameters, was present in most cases. Notably, severe microcephaly (typically with Z scores < −5) was universal. Overall, the disorder seems to have a poor prognosis as two affected individuals died in childhood or early adult life."; to: PMID: 33186543 - 2x de novo hetorozygous missense variants in the AAA (large ATPase) domain.
1x homozygous missense in the MIT domain (milder phenotype and unaffected parents).
Demonstrated defective CD71 trafficking in all 3 patients.

Comment when marking as ready: PMID: 33186543 - 2x de novo hetorozygous missense variants in the AAA (large ATPase) domain. 1x homozygous missense in the MIT domain (milder phenotype and unaffected parents). Demonstrated defective CD71 trafficking in all 3 patients. PMID: 33186545 - 6x probands with de novo missense variants in the AAA domain. 5 of the variants were at amino acid position 284 (changes to Trp and Gly). Demonstrated that the variants had a dominant-negative effect on VPS4A function. "The six probands with de novo substitutions affecting Glu206 or Arg284 had a consistent phenotype characterized by severe DD, profound ID, and dystonia. Children were very delayed in establishing head control and none achieved independent walking. Other common findings were cerebellar hypoplasia (five individuals out of six, the other showing uncharacterized severe cerebral atrophy) with a variable degree of corpus callosum hypoplasia. One individual also had bilateral polymicrogyria. Epilepsy was present in three and dystonia in five subjects. Eye involvement was also a common finding, including congenital cataract, retinal dystrophy, and in one case congenital Leber amaurosis. Four individuals were diagnosed with hepatosplenomegaly and/or steatosis. Three subjects had anemia, which was characterized as dyserythropoietic in two. Severe feeding difficulties were present in four individuals, requiring assisted feeding in three. Two had sensorineural deafness. Severe growth retardation, generally for all parameters, was present in most cases. Notably, severe microcephaly (typically with Z scores < −5) was universal. Overall, the disorder seems to have a poor prognosis as two affected individuals died in childhood or early adult life."
Mendeliome v0.5567 VPS4A Elena Savva Added comment: Comment when marking as ready: PMID: 33186543 - 2x de novo hetorozygous missense variants in the AAA (large ATPase) domain. 1x homozygous missense in the MIT domain (milder phenotype and unaffected parents). Demonstrated defective CD71 trafficking in all 3 patients. PMID: 33186545 - 6x probands with de novo missense variants in the AAA domain. 5 of the variants were at amino acid position 284 (changes to Trp and Gly). Demonstrated that the variants had a dominant-negative effect on VPS4A function. "The six probands with de novo substitutions affecting Glu206 or Arg284 had a consistent phenotype characterized by severe DD, profound ID, and dystonia. Children were very delayed in establishing head control and none achieved independent walking. Other common findings were cerebellar hypoplasia (five individuals out of six, the other showing uncharacterized severe cerebral atrophy) with a variable degree of corpus callosum hypoplasia. One individual also had bilateral polymicrogyria. Epilepsy was present in three and dystonia in five subjects. Eye involvement was also a common finding, including congenital cataract, retinal dystrophy, and in one case congenital Leber amaurosis. Four individuals were diagnosed with hepatosplenomegaly and/or steatosis. Three subjects had anemia, which was characterized as dyserythropoietic in two. Severe feeding difficulties were present in four individuals, requiring assisted feeding in three. Two had sensorineural deafness. Severe growth retardation, generally for all parameters, was present in most cases. Notably, severe microcephaly (typically with Z scores < −5) was universal. Overall, the disorder seems to have a poor prognosis as two affected individuals died in childhood or early adult life."
Mendeliome v0.5558 VPS4A Kristin Rigbye gene: VPS4A was added
gene: VPS4A was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: VPS4A was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Publications for gene: VPS4A were set to PMID: 33186543; 33186545
Phenotypes for gene: VPS4A were set to Neurodevelopmental disorder
Review for gene: VPS4A was set to GREEN
Added comment: PMID: 33186543 - 2x de novo hetorozygous missense variants in the AAA (large ATPase) domain.
1x homozygous missense in the MIT domain (milder phenotype and unaffected parents).
Demonstrated defective CD71 trafficking in all 3 patients.

PMID: 33186545 - 6x probands with de novo missense variants in the AAA domain. 5 of the variants were at amino acid position 284 (changes to Trp and Gly).
Demonstrated that the variants had a dominant-negative effect on VPS4A function.
"The six probands with de novo substitutions affecting Glu206 or Arg284 had a consistent phenotype characterized by severe DD, profound ID, and dystonia. Children were very delayed in establishing head control and none achieved independent walking. Other common findings were cerebellar hypoplasia (five individuals out of six, the other showing uncharacterized severe cerebral atrophy) with a variable degree of corpus callosum hypoplasia. One individual also had bilateral polymicrogyria. Epilepsy was present in three and dystonia in five subjects. Eye involvement was also a common finding, including congenital cataract, retinal dystrophy, and in one case congenital Leber amaurosis. Four individuals were diagnosed with hepatosplenomegaly and/or steatosis. Three subjects had anemia, which was characterized as dyserythropoietic in two. Severe feeding difficulties were present in four individuals, requiring assisted feeding in three. Two had sensorineural deafness. Severe growth retardation, generally for all parameters, was present in most cases. Notably, severe microcephaly (typically with Z scores < −5) was universal. Overall, the disorder seems to have a poor prognosis as two affected individuals died in childhood or early adult life."
Sources: Literature
Mendeliome v0.5222 MPP5 Konstantinos Varvagiannis gene: MPP5 was added
gene: MPP5 was added to Mendeliome. 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
Mendeliome v0.5182 HBB Zornitza Stark Phenotypes for gene: HBB were changed from to Delta-beta thalassemia 141749; Erythrocytosis 6 617980; Heinz body anemia 140700; Hereditary persistence of fetal hemoglobin 141749; Methemoglobinemia, beta type 617971; Sickle cell anemia 603903; Thalassemia-beta, dominant inclusion-body 603902; Thalassemia, beta 613985
Mendeliome v0.5174 HBB Elena Savva reviewed gene: HBB: Rating: GREEN; Mode of pathogenicity: None; Publications: PMID: 31788855, 20301599, 29700171; Phenotypes: {Malaria, resistance to} 611162, Delta-beta thalassemia 141749, Erythrocytosis 6 617980, Heinz body anemia 140700, Hereditary persistence of fetal hemoglobin 141749, Methemoglobinemia, beta type 617971, Sickle cell anemia 603903, Thalassemia-beta, dominant inclusion-body 603902, Thalassemia, beta 613985; Mode of inheritance: BOTH monoallelic and biallelic, autosomal or pseudoautosomal; Current diagnostic: yes
Mendeliome v0.5150 CYP3A4 Zornitza Stark Phenotypes for gene: CYP3A4 were changed from to Vitamin D-dependent rickets-3, MIM#619073
Mendeliome v0.5146 CYP3A4 Zornitza Stark reviewed gene: CYP3A4: Rating: GREEN; Mode of pathogenicity: Other; Publications: 29461981; Phenotypes: Vitamin D-dependent rickets-3, MIM#619073; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Mendeliome v0.4789 PRICKLE3 Seb Lunke Marked gene: PRICKLE3 as ready
Mendeliome v0.4789 PRICKLE3 Seb Lunke Gene: prickle3 has been classified as Red List (Low Evidence).
Mendeliome v0.4789 PRICKLE3 Seb Lunke Classified gene: PRICKLE3 as Red List (low evidence)
Mendeliome v0.4789 PRICKLE3 Seb Lunke Gene: prickle3 has been classified as Red List (Low Evidence).
Mendeliome v0.4783 PRICKLE3 Teresa Zhao gene: PRICKLE3 was added
gene: PRICKLE3 was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: PRICKLE3 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: PRICKLE3 were set to 32516135
Phenotypes for gene: PRICKLE3 were set to Leber’s hereditary optic neuropathy MIM#535000
Review for gene: PRICKLE3 was set to AMBER
Added comment: Reported as X-linked LHON modifier (c.157C>T, p.Arg53Trp) in PRICKLE3 in 3 Chinese families. All affected individuals carried both ND4 11778G>A and p.Arg53Trp mutations, while subjects bearing only a single mutation exhibited normal vision.

Defective assembly, stability, and function of ATP synthase observed using Lymphoblastoid cell lines from one of the families.

This finding indicated that the p.Arg53Trp mutation acted in synergy with the m.11778G>A mutation and deteriorated mitochondrial dysfunctions necessary for the expression of LHON.

Prickle3-deficient mice exhibited pronounced ATPase deficiencies.
Sources: Literature
Mendeliome v0.4668 BLOC1S5 Zornitza Stark gene: BLOC1S5 was added
gene: BLOC1S5 was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: BLOC1S5 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: BLOC1S5 were set to 32565547
Phenotypes for gene: BLOC1S5 were set to Hermansky–Pudlak syndrome
Review for gene: BLOC1S5 was set to GREEN
Added comment: 2 unrelated patients with mild oculocutaneous albinism, moderate bleeding diathesis, platelet aggregation deficit, and a dramatically decreased number of platelet dense granules, all signs compatible with HPS. Identified distinct homozygous variants in the BLOC1S5 gene (patient 1: deletion of exons 3 and 4, patient 2: 1-bp deletion in exon 4). Parental segregation confirmatory in patient 1, quantitative PCR analysis confirmatory in patient 2). Functional tests performed on platelets of one patient displayed an absence of the obligate multisubunit complex BLOC-1, showing that the variant disrupts BLOC1S5 function and impairs BLOC-1 assembly. Expression of the patient-derived BLOC1S5 deletion in nonpigmented murine Bloc1s5-/- melan-mu melanocytes failed to rescue pigmentation, the assembly of a functional BLOC-1 complex, and melanosome cargo trafficking, unlike the wild-type allele. Pathogenic variants in the genes encoding three other BLOC-1 subunits (DTNBP1, BLOC1S3, and BLOC1S6) underlie HPS types 7, 8, and 9 respectively.
Sources: Literature
Mendeliome v0.4520 SLC12A2 Zornitza Stark edited their review of gene: SLC12A2: Added comment: Monoallelic :
DD/ID was a feature in >= 6 individuals with monoallelic de novo SLC12A2. An individual with an exon 22 truncating variant was reported to have normal milestones and cognitive function. Exon 21 variants have been described in individuals with rather isolated hearing impairment (possibly some associated motor delay, but normal cognition). Hearing impairment was also reported in 2/6 patients with variants in other exons (1 missense / 1 frameshift).

Biallelic :
DD/ID was reported in at least 3 individuals in literature. Hearing impairment has been reported on 2 occasions (although this was not probably evaluated in all subjects).

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Monoallelic SLC12A2 mutations :

► Individuals with de novo mutations and developmental disorder were first identified by the DDD study (2017 - PMID: 28135719). 5 of them have been reported in detail by McNeill et al (below).

► McNeill et al (2020 - PMID: 32658972) report on 6 individuals with neurodevelopmental disorder due to de novo SLC12A2 mutation. All presented DD or ID ranging from mild to severe. ASD was reported in 3/6. Sensorineural hearing loss was a feature in 2/6 with the remaining having normal formal evaluations. Brain, cardiac and/or additional malformations were reported in a single individual. Following non-diagnostic prior work-up (CMA, FMR1 or other investigations) trio exome sequencing revealed missense (4/6) or truncating variants (2/6).

Three additional individuals (incl. a father and his son) with missense variants in exon 21 (NM_001046.3 / p.Glu979Lys and p.Glu980Lys) presented with bilateral sensorineural hearing loss. Speech and/or motor delay reported in these cases were attributed to the hearing impairment/vestibular arreflexia (cognitive abilities not tested).

SLC12A2 encodes sodium-potassium-chloride transporter 1 (also NKCC1).

The GTEx project has identified 8 isoforms. In brain both exon 21-containing/deleted isoforms are expressed (cited Morita et al 2014 - PMID: 24695712). As the authors discuss, RNA-seq of the developing mouse cochlea suggests that the exon 21 containing isoform is the single transcript expressed. Evidence from RNA-seq data (BrainSpan project) and literature suggests that the significant amounts of exon 21 lacking isoforms in fetal brain compensate for the deleterious effects of exon 21 variants and explain the lack of NDD in relevant patients.

Slc12a2 (NKCC1) null mouse model has demonstrated that the transporter plays a role in accumulation of the potassium rich endolymph in the inner ear, with NKCC1 absence causing sensorineural deafness and imbalance. Slc12a2 display cochlear malformations, loss of hair cells and hearing impairment (cited Delpire et al 1999 - PMID: 10369265). The brain phenotype has not been studied extensively, although loss of Slc12a2 has been shown to inhibit neurogenesis (cited: Magalhães and Rivera et al. - PMID: 27582690).

Slc12a2 null zebrafish display a collapse of the otic vesicle and reduced endolymph (Abbas and Whitfield, 2009 - PMID: 19633174) relevant to the human hearing disorder.

In vitro assessment of NKCC1 ion transporter function in Xenopus laevis, supported the deleterious effect of the identified variants (significant reduction in K+ influx). Using available single cell RNA-seq data the authors further demonstrated that SLC12A2 expressing cells display transcriptomic profiles reflective of active neurogenesis.

► Delpire et al (2016 - PMID: 27900370 - not reviewed in detail) described a 13 y.o. girl harboring a de novo 11-bp deletion in SLC12A2 exon 22. This individual reached developmental milestones on time and had a NORMAL cognitive function. Hearing was seemingly normal. Features included orthostatic intolerance, respiratory weakness, multiple endocrine abnormalities, pancreatic insufficiency and multiorgan failure incl. gut and bladder. Exome in the proband, parents and 3 unaffected sibs suggested SLC12A2 as the only candidate for her phenotype. Functional analyses in Xenopus laevis oocytes suggested that a non functional transporter was expressed and trafficked to the membrane as the wt. Detection of the truncated protein at higher molecular sizes suggested either enhanced dimerization or misfolded aggregate. There was no dominant-negative effect of mutant NKCC1. In patient fibroblasts a reduced total and NKCC1-mediated K+ influx.

► Mutai et al (2020 - PMID: 32294086) report on several individuals from 4 families, harboring variants within exon 21 or - in one case - at it's 3' splice-site (leading to skipping oe this exon at the mRNA level). All subjects were investigated for severe/profound hearing loss (in line with the role of exon 21-included isoforms in cochlea. The variant segregated with hearing impairment in 3 generations of a family while in all other subjects the variant had occured as de novo event. Despite motor delays (e.g. the subject from fam2 could not hold head or sit at the age of 10m / the proband in Fam3 was able to hold his head and walk at 6 and 20 m respectively) behavior and cognition were commented to be within normal range.


-----

Biallelic SLC12A2 mutations:

► Anazi et al (2017 - PMID: 29288388) briefly reported on a 3 y.o. boy (17DG0776) with central hypotonia, neonatal respiratory distress, failure to thrive, global DD and microcephaly and a skeletal survey suggestive of osteopenia. After non-diagnostic prior investigations (CMA revealing a 1p duplication classified as VUS, extensive metabolic workup), WES revealed a homozygous SLC12A2 splicing variant [NM_001046.2:c.2617-2A>G].

► Macnamara et al (2019 - PMID: 30740830) described a 5.5 y.o. male with sensorineural hearing loss, profound delays in all developmental areas among several other features (choanal atresia, failure to thrive, respiratory problems, absent sweat and tear production or salivation, GI abnormalities). Genetic testing for several disorders considered (cystic fibrosis, spinal muscular atrophy, sequencing and del/dup analysis of mtDNA) was normal. CMA revealed paternal uniparental isodisomy for chr. 5 and WGS a homozygous 22kb deletion in SLC12A2. This was followed by confirmation of homozygosity in the proband, heterozygosity of the unaffected father, delineation of breakpoints (chr5:127441491-127471419). mRNA studies in patient fibroblasts confirmed deletion of ex2-7, splicing of ex1 directly to ex8 and introduction of a premature stop codon in ex9. qRT-PCR confirmed that mRNA is likely subjected to NMD (expression ~80% of control). Western blot confirmed absence of the protein in the patient's fibroblasts. Again mouse models are thought to recapitulate the hearing defect but also the deficient saliva production (cited Evans et al 2000 - PMID: 10831596). Again the authors speculate a role of SLC12A2 in brain development based on evidence from murine models (migration, dendritic growth, increse in neuron density through regulation of GABAergic signalling (Young et al 2012 - PMID: 23015452). Hypotheses are also made on a regulatory relationship between NKCC1 and CFTR based on mRNA data from the ko mouse model.

► Stödberg et al (2020 - PMID: 32754646) reported 2 sibs with a complex neurodevelopmental disorder due to compound heterozygosity for a frameshift SLC12A2 variant and a splicing one (NM_001046:c.1431delT and c.2006-1G>A). Both presented hypotonia, neonatal S. aureus parotitis and respiratory problems (incl. apneas). While the older sib died at the age of 22 days, the younger one had persistent respiratory issues incl. a dry respiratory mucosa motivating metabolic, immunology investigations and testing for CF. She displayed microcephaly (OFC -2.5 SD, H was also -3.5SD), severe intellectual disability. MRI was suggestive of white matter and basal ganglia abnormalities. Other features incl. hearing impairment, and lack of tears,saliva and sweat, constipation and intestinal malrotation. There was facial dysmorphism. The variants were the only retained following WGS of the 2 affected sisters, parents and an unaffected brother. The splicing variant was shown to result in skipping of exon 13, while the indel in NMD. Again the authors discuss that the deficient saliva production, impaired hearing and GI problems are recapitulated in the mouse model (several refs provided).; Changed rating: GREEN; Changed publications: 28135719, 32658972, 27900370, 32294086, 29288388, 30740830, 32754646; Changed phenotypes: Kilquist syndrome, deafness, intellectual disability, dysmorphic features, absent salivation, ectodermal dysplasia, constipation, intestinal malrotation, multiple congenital anomalies; Changed mode of inheritance: BOTH monoallelic and biallelic, autosomal or pseudoautosomal
Mendeliome v0.4134 TRAPPC2L Arina Puzriakova changed review comment from: Gene is associated with Encephalopathy, progressive, early-onset, with episodic rhabdomyolysis in OMIM, but not in G2P.

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; to: 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
Mendeliome v0.4134 TRAPPC2L Arina Puzriakova gene: TRAPPC2L was added
gene: TRAPPC2L was added to Mendeliome. 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: Gene is associated with Encephalopathy, progressive, early-onset, with episodic rhabdomyolysis in OMIM, but not in G2P.

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
Mendeliome v0.4063 COL11A1 Zornitza Stark Phenotypes for gene: COL11A1 were changed from to Fibrochondrogenesis 1 (MIM#228520); Marshall syndrome (MIM#154780); Stickler syndrome, type II (MIM#604841)
Mendeliome v0.4059 COL11A1 Elena Savva reviewed gene: COL11A1: Rating: GREEN; Mode of pathogenicity: Other; Publications: PMID 25073711, 30245514, 32427345, 27081569, 21035103; Phenotypes: Fibrochondrogenesis 1 (MIM#228520), Marshall syndrome (MIM#154780), Stickler syndrome, type II (MIM#604841), {Lumbar disc herniation, susceptibility to}, (MIM#603932), ?Deafness, autosomal dominant 37, (MIM#618533); Mode of inheritance: BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal
Mendeliome v0.3763 FAM83G Zornitza Stark gene: FAM83G was added
gene: FAM83G was added to Mendeliome. Sources: Expert list
Mode of inheritance for gene: FAM83G was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: FAM83G were set to 29138053
Phenotypes for gene: FAM83G were set to Palmoplantar keratoderma, curly scalp hair and toenail dystrophy
Review for gene: FAM83G was set to RED
Added comment: PMID: 29138053; - 2 siblings born of consanguineous family presented with palmoplantar keratoderma and exuberant curly scalp hair - progressive development of yellowish thickened scaly skin affecting the palms and soles since 2 years of age, and toenail dystrophy in their teenage years > homozygous for a missense p.(Ala34Glu)
Sources: Expert list
Mendeliome v0.3728 SGK3 Zornitza Stark gene: SGK3 was added
gene: SGK3 was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: SGK3 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Publications for gene: SGK3 were set to 31821448
Phenotypes for gene: SGK3 were set to Hypophosphatemic rickets
Review for gene: SGK3 was set to RED
Added comment: 5 individuals from one family where a splice site variant segregated with disease.
Sources: Literature
Mendeliome v0.3656 FBXL7 Zornitza Stark Phenotypes for gene: FBXL7 were changed from Hennekam lymphangiectasia-lymphedema syndrome; lymphedema; protein‐losing enteropathy; dental anomalies; camptodactyly; microtia; small auditory canals; ductive hearing loss; middle ear anomalies, bifid scrotum, and facial dysmorphic features including hypertelorism, telecanthus, epicanthal folds, downslanting palpebral fissures, broad and depressed nasal bridge, and thickened nasal alae. to Hennekam lymphangiectasia-lymphedema syndrome
Mendeliome v0.3648 FBXL7 Hazel Phillimore changed review comment from: Homozygous deletion of exon 3 of FBXL7 (predicted to be in-frame) in a 2-year old with novel form of Hennekam syndrome. Each parent was heterozygous.
Patient had lymphedema, protein‐losing enteropathy, dental anomalies, camptodactyly, microtia, small auditory canals, ductive hearing loss, middle ear anomalies, bifid scrotum, and facial dysmorphic features including hypertelorism, telecanthus, epicanthal folds, downslanting palpebral fissures, broad and depressed nasal bridge, and thickened nasal alae.
Sources: Literature; to: Homozygous deletion of exon 3 of FBXL7 (predicted to be in-frame) in a 2-year old with novel form of Hennekam syndrome. Each parent was heterozygous.
Patient had lymphedema, protein‐losing enteropathy, dental anomalies, camptodactyly, microtia, small auditory canals, ductive hearing loss, middle ear anomalies, bifid scrotum, and facial dysmorphic features including hypertelorism, telecanthus, epicanthal folds, downslanting palpebral fissures, broad and depressed nasal bridge, and thickened nasal alae.
Sources: Literature
Mendeliome v0.3647 FBXL7 Hazel Phillimore gene: FBXL7 was added
gene: FBXL7 was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: FBXL7 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: FBXL7 were set to PMID: 31633297
Phenotypes for gene: FBXL7 were set to Hennekam lymphangiectasia-lymphedema syndrome; lymphedema; protein‐losing enteropathy; dental anomalies; camptodactyly; microtia; small auditory canals; ductive hearing loss; middle ear anomalies, bifid scrotum, and facial dysmorphic features including hypertelorism, telecanthus, epicanthal folds, downslanting palpebral fissures, broad and depressed nasal bridge, and thickened nasal alae.
Review for gene: FBXL7 was set to AMBER
Added comment: Homozygous deletion of exon 3 of FBXL7 (predicted to be in-frame) in a 2-year old with novel form of Hennekam syndrome. Each parent was heterozygous.
Patient had lymphedema, protein‐losing enteropathy, dental anomalies, camptodactyly, microtia, small auditory canals, ductive hearing loss, middle ear anomalies, bifid scrotum, and facial dysmorphic features including hypertelorism, telecanthus, epicanthal folds, downslanting palpebral fissures, broad and depressed nasal bridge, and thickened nasal alae.
Sources: Literature
Mendeliome v0.3325 TBC1D2B Zornitza Stark gene: TBC1D2B was added
gene: TBC1D2B was added to Mendeliome. Sources: Expert Review
Mode of inheritance for gene: TBC1D2B was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: TBC1D2B were set to 32623794
Phenotypes for gene: TBC1D2B were set to Global developmental delay; Intellectual disability; Seizures; Gingival overgrowth; Behavioral abnormality; Abnormality of the mandible; Abnormality of brain morphology; Abnormality of the eye; Hearing abnormality
Review for gene: TBC1D2B was set to GREEN
Added comment: Harms et al (2020 - PMID: 32623794) report on 3 unrelated individuals with biallelic pLoF TBC1D2B variants. Features included cognitive impairment (mild ID in one case, regression at the age of 12y in another, hypotonia and delayed milestones in a third aged 8m), seizures (3/3 - variable age of onset) and/or gingival overgrowth (2/3 - prior to initiation of AEDs). Other findings included behavioral abnormalities, mandibular anomalies, abnormal brain imaging and ophthalmologic or (rarely) audiometric evaluations. All were born to non-consanguineous couples and additional investigations were performed in some. Variants were identified by WES or trio WGS, with Sanger confirmation/compatible segregation analyses. In line with the pLoF variants, mRNA studies in fibroblasts from 2 unrelated affected individuals demonstrated significantly reduced (~80-90%) TBC1C2D mRNA levels compared to controls, restored following cycloheximide treatment. Protein was absent in patient fibroblasts. TBC-domain containing GTPase activating proteins are known as key regulators of RAB GTPase activity. TBC1D2B was shown to colocalize with RAB5-positive endocytic vesicles. CRISPR/Cas9-mediated ko of TBC1D2B in HeLa cells suggested a role in EGF receptor endocytosis and decreased cell viability of TBC1D2B-deficient HeLa cells upon serum deprivation. Genes encoding other TBC domain-containg GTPase-activating proteins, e.g. TBC1D7 and TBC1D20, TBC1D24 are associated with recessive neurodevelopmental disorders (with ID and/or seizures) and the pathophysiological defect in TBC1D2B-related disorder (deficit in vesicle trafficking and/or cell survival) is proposed to be similar to that of TBC1D24.
Sources: Expert Review
Mendeliome v0.2943 KIF3B Paul De Fazio gene: KIF3B was added
gene: KIF3B was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: KIF3B was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Phenotypes for gene: KIF3B were set to hepatic fibrosis; retinitis pigmentosa; postaxial polydactyly
Review for gene: KIF3B was set to AMBER
Added comment: 2 families reported with missense variants, one de novo and one segregating in a six-generation pedigree. Functional studies in zebrafish showed the variants result in impaired rhodopsin trafficking.
Sources: Literature
Mendeliome v0.1496 COL2A1 Zornitza Stark Phenotypes for gene: COL2A1 were changed from to Achondrogenesis, type II or hypochondrogenesis 200610; Avascular necrosis of the femoral head 608805; Czech dysplasia 609162; Epiphyseal dysplasia, multiple, with myopia and deafness 132450; Kniest dysplasia 156550; Legg-Calve-Perthes disease 150600; Osteoarthritis with mild chondrodysplasia 604864; Platyspondylic skeletal dysplasia, Torrance type 151210; SED congenita 183900; SMED Strudwick type 184250; Spondyloepiphyseal dysplasia, Stanescu type 616583; Spondyloperipheral dysplasia 271700; Stickler sydrome, type I, nonsyndromic ocular 609508; Stickler syndrome, type I 108300; Vitreoretinopathy with phalangeal epiphyseal dysplasia
Mendeliome v0.1473 COL2A1 Elena Savva reviewed gene: COL2A1: Rating: GREEN; Mode of pathogenicity: None; Publications: PMID: 15895462, 17721977, 27234559, 20179744; Phenotypes: Achondrogenesis, type II or hypochondrogenesis 200610, Avascular necrosis of the femoral head 608805, Czech dysplasia 609162, Epiphyseal dysplasia, multiple, with myopia and deafness 132450, Kniest dysplasia 156550, Legg-Calve-Perthes disease 150600, Osteoarthritis with mild chondrodysplasia 604864, Platyspondylic skeletal dysplasia, Torrance type 151210, SED congenita 183900, SMED Strudwick type 184250, Spondyloepiphyseal dysplasia, Stanescu type 616583, Spondyloperipheral dysplasia 271700, Stickler sydrome, type I, nonsyndromic ocular 609508, Stickler syndrome, type I 108300, Vitreoretinopathy with phalangeal epiphyseal dysplasia; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted; Current diagnostic: yes
Mendeliome v0.1192 CLCN5 Zornitza Stark Phenotypes for gene: CLCN5 were changed from to Dent disease, MIM#300009; Hypophosphatemic rickets, MIM#300554; Nephrolithiasis, type I, MIM#310468; Proteinuria, low molecular weight, with hypercalciuric nephrocalcinosis, MIM#308990
Mendeliome v0.1190 CLCN5 Zornitza Stark reviewed gene: CLCN5: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Dent disease, MIM#300009, Hypophosphatemic rickets, MIM#300554, Nephrolithiasis, type I, MIM#310468, Proteinuria, low molecular weight, with hypercalciuric nephrocalcinosis, MIM#308990; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females
Mendeliome v0.1190 PHEX Zornitza Stark Phenotypes for gene: PHEX were changed from to Hypophosphatemic rickets, MIM#307800
Mendeliome v0.1188 PHEX Zornitza Stark reviewed gene: PHEX: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Hypophosphatemic rickets, MIM#307800; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males)
Mendeliome v0.1111 FLNA Zornitza Stark Phenotypes for gene: FLNA were changed from to ?FG syndrome 2, XL; Cardiac valvular dysplasia, X-linked; Congenital short bowel syndrome; Frontometaphyseal dysplasia 1; Heterotopia, periventricular, 1; Intestinal pseudoobstruction, neuronal Melnick-Needles syndrome; Otopalatodigital syndrome, type I; Otopalatodigital syndrome, type II; Terminal osseous dysplasia
Mendeliome v0.1069 FLNA Elena Savva reviewed gene: FLNA: Rating: GREEN; Mode of pathogenicity: None; Publications: PMID: 30089473; Phenotypes: ?FG syndrome 2, XL, Cardiac valvular dysplasia, X-linked, Congenital short bowel syndrome, Frontometaphyseal dysplasia 1, Heterotopia, periventricular, 1, Intestinal pseudoobstruction, neuronal Melnick-Needles syndrome, Otopalatodigital syndrome, type I, Otopalatodigital syndrome, type II, Terminal osseous dysplasia; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males)
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
Mendeliome v0.288 MAST1 Zornitza Stark gene: MAST1 was added
gene: MAST1 was added to Mendeliome_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 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
Mendeliome v0.0 PRICKLE2 Zornitza Stark gene: PRICKLE2 was added
gene: PRICKLE2 was added to Mendeliome_VCGS. Sources: Expert Review Green,Victorian Clinical Genetics Services
Mode of inheritance for gene: PRICKLE2 was set to Unknown
Mendeliome v0.0 PRICKLE1 Zornitza Stark gene: PRICKLE1 was added
gene: PRICKLE1 was added to Mendeliome_VCGS. Sources: Expert Review Green,Victorian Clinical Genetics Services
Mode of inheritance for gene: PRICKLE1 was set to Unknown
Mendeliome v0.0 ICK Zornitza Stark gene: ICK was added
gene: ICK was added to Mendeliome_VCGS. Sources: Expert Review Green,Victorian Clinical Genetics Services
Mode of inheritance for gene: ICK was set to Unknown