Severe microcephaly
Gene: SVBPThe rating of this gene has been updated following NHS Genomic Medicine Service approval.Created: 10 Mar 2022, 10:52 a.m. | Last Modified: 10 Mar 2022, 10:52 a.m.
Panel Version: 2.282
Comment on list classification: New gene added by Zornitza Stark (Australian Genomics). There is sufficient evidence to rate this gene Green at the next GMS panel update (added 'for-review' tag).
12 individuals from 5 independent families (PMIDs: 31363758 and 30607023). Phenotypes include severe microcephaly in >3 families. SVBP is associated with a relevant phenotype in OMIM.Created: 4 Dec 2020, 12:45 p.m. | Last Modified: 4 Dec 2020, 12:45 p.m.
Panel Version: 2.48
5 unrelated families with homozygous mutations in SVBP, microcephaly is part of the phenotype. The mutations segregated with the disorder in all families. In vitro functional cellular expression studies showed that protein levels of the SVBP mutants were barely detectable, suggesting instability, and that the mutant proteins had lost VASH/SVBP catalytic detyrosination activity toward tubulin. Knockdown of about 50% Svbp expression using shRNA in rat hippocampal neurons impaired the formation of excitatory synapses compared to controls.
Sources: Expert listCreated: 3 Sep 2020, 9:03 a.m.
Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal
Phenotypes
Neurodevelopmental disorder with ataxia, hypotonia, and microcephaly, OMIM #618569
Publications
Tag gene-checked tag was added to gene: SVBP.
Tag for-review was removed from gene: SVBP.
Source Expert Review Green was added to SVBP. Rating Changed from Amber List (moderate evidence) to Green List (high evidence)
Phenotypes for gene: SVBP were changed from Neurodevelopmental disorder with ataxia, hypotonia, and microcephaly, OMIM #618569 to Neurodevelopmental disorder with ataxia, hypotonia, and microcephaly, OMIM:618569; Neurodevelopmental disorder with ataxia, hypotonia, and microcephaly, MONDO:0032816
Tag for-review tag was added to gene: SVBP.
Gene: svbp has been classified as Amber List (Moderate Evidence).
gene: SVBP was added gene: SVBP was added to Severe microcephaly. Sources: Expert list Mode of inheritance for gene: SVBP was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: SVBP were set to 31363758; 30607023 Phenotypes for gene: SVBP were set to Neurodevelopmental disorder with ataxia, hypotonia, and microcephaly, OMIM #618569 Review for gene: SVBP was set to GREEN