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| Intellectual disability syndromic and non-syndromic v0.5514 | MYCN | Naomi Baker commented on gene: MYCN: Three individuals now reported with gain-of-function missense variants (identical variant in two individuals). Clinical presentation includes megalencephaly, hypoplastic corpus callosum, postaxial polydactyly, intellectual disability and motor delay. Knock-in mouse model showed morphological manifestations in multiple tissues including digits, female reproductive system and kidney. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5323 | AQP4 | Zornitza Stark Phenotypes for gene: AQP4 were changed from ?Megalencephalic leukoencephalopathy with subcortical cysts 4, remitting MIM#620448 to Megalencephalic leukoencephalopathy with subcortical cysts 4, remitting MIM#620448 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5317 | AQP4 |
Lucy Spencer gene: AQP4 was added gene: AQP4 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: AQP4 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: AQP4 were set to 37143309 Phenotypes for gene: AQP4 were set to ?Megalencephalic leukoencephalopathy with subcortical cysts 4, remitting MIM#620448 Review for gene: AQP4 was set to AMBER Added comment: PMID: 37143309 Cohort patients with an MRI based diagnosis of megalencephalic leukoencephalopathy with subcortical cysts (MLC). Missense variant in AQP4 seen homozygous in 2 siblings and het in the parents. Patients had macrocephaly, developmental delay, hypotonia, epilepsy, and cognitive deficit. Western blots on generated MDCK cell lines showed no detectable expression of AQP4 protein from the cells with the patients variant. Immunofluorescence also showed no membrane expression. Overexpression studies in HEK293T cells showed WT was seen as mainly monomers or dimers where as variant protein formed large aggregates- likely due to the saturation of protein degradation pathways because of the overexpression. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5313 | GPRC5B |
Lucy Spencer gene: GPRC5B was added gene: GPRC5B was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: GPRC5B was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: GPRC5B were set to PMID: 37143309 Phenotypes for gene: GPRC5B were set to Megalencephalic leukoencephalopathy with subcortical cysts 3 MIM#620447 Review for gene: GPRC5B was set to GREEN Added comment: PMID: 37143309 Cohort of 5 patients with an MRI based diagnosis of megalencephalic leukoencephalopathy with subcortical cysts (MLC). 3 unrelated patients had variants in GPRC5B, 2 have the same inframe dup Ile175dup and the third has an in frame dup of Ala177. All 3 were de novo and unaffected siblings did not have the variants. All patients have macrocephaly, delayed motor development, spasticity, ataxia and dystonia, seizures, all had varying degrees of cognitive deficits. MRI showed MLC, abnormal and swollen cerebral white matter. Patient cell lines showed reduced regulatory volume decrease, and western blot showed a strong increase in GRPC5B levels in patient lymphoblasts. Together, these findings indicate disturbed volume regulation in lymphoblasts from patients with GPRC5B variants, potentially due to increased GPRC5B levels. Transfected cells caused increased volume-regulated anion channel activity. Sources: Literature |
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| Intellectual disability syndromic and non-syndromic v0.5003 | AKT3 | Zornitza Stark Phenotypes for gene: AKT3 were changed from to Megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome 2, MIM# 615937 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5000 | AKT3 | Zornitza Stark reviewed gene: AKT3: Rating: GREEN; Mode of pathogenicity: None; Publications: 22729224, 22729223, 35665751, 34354878, 32446860, 31441589; Phenotypes: Megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome 2, MIM# 615937; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4955 | GALE | Zornitza Stark Tag treatable tag was added to gene: GALE. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4420 | CCND2 |
Alison Yeung Added comment: Comment on phenotypes: Distal variants associated with Megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome 3 Proximal variants associated with reciprocal phenotype of mild neurodevelopment disorder with microcephaly and short stature |
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| Intellectual disability syndromic and non-syndromic v0.4420 | CCND2 | Alison Yeung Phenotypes for gene: CCND2 were changed from to Megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome 3, MIM# 615938; Neurodevelopmental disorder, CCND2-related MONDO: 0700092; Microcephaly, MONDO: 0001149 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3629 | PIK3R2 | Zornitza Stark Phenotypes for gene: PIK3R2 were changed from to Megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome 1, MIM# 603387 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.3626 | PIK3R2 | Zornitza Stark reviewed gene: PIK3R2: Rating: GREEN; Mode of pathogenicity: None; Publications: 22729224, 23745724, 33604570; Phenotypes: Megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome 1, MIM# 603387; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2285 | TBC1D7 | Zornitza Stark Phenotypes for gene: TBC1D7 were changed from to Macrocephaly/megalencephaly syndrome, autosomal recessive, MIM# 248000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2281 | TBC1D7 | Zornitza Stark reviewed gene: TBC1D7: Rating: AMBER; Mode of pathogenicity: None; Publications: 24515783, 23687350; Phenotypes: Macrocephaly/megalencephaly syndrome, autosomal recessive, MIM# 248000; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.2261 | STRADA |
Zornitza Stark gene: STRADA was added gene: STRADA was added to Intellectual disability syndromic and non-syndromic. Sources: Expert list Mode of inheritance for gene: STRADA was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: STRADA were set to 17522105; 27170158; 28688840 Phenotypes for gene: STRADA were set to Polyhydramnios, megalencephaly, and symptomatic epilepsy, MIM# 611087 Review for gene: STRADA was set to GREEN Added comment: Seven distantly related Menonite children plus four other unrelated families reported. Sources: Expert list |
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| Intellectual disability syndromic and non-syndromic v0.0 | GALE |
Zornitza Stark gene: GALE was added gene: GALE was added to Intellectual disability, syndromic and non-syndromic_GHQ. Sources: Expert Review Green,Genetic Health Queensland Mode of inheritance for gene: GALE was set to Unknown |
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