Early onset or syndromic epilepsy

Gene: SNF8

I don't know

Comment on list classification: There are only two unrelated patients reported with seizures and hence this gene should be rated amber with current evidence.

Created: 13 Mar 2024, 5:56 a.m. | Last Modified: 13 Mar 2024, 5:56 a.m.

Panel Version: 4.181

PMID:38423010 reported nine individuals from six families presenting with a spectrum of neurodevelopmental/ neurodegenerative features caused by biallelic variants in SNF8.

The phenotypic spectrum included four individuals with severe developmental and epileptic encephalopathy with leukoencephalopathy and early death in three of those cases. Two individuals died too young to develop epilepsy. A second cohort shows a milder phenotype with intellectual disability, childhood-onset optic atrophy, or ataxia. All mildly affected individuals shared the same hypomorphic variant, c.304G>A (p.Val102Ile) as compound heterozygous.

Functional studies using fibroblasts derived from patients and zebrafish model showed loss of function as the disease mechanism.

This gene has not yet been associated with any phenotypes either in OMIM or in Gene2Phenotype.
Sources: Literature

Created: 13 Mar 2024, 5:54 a.m.

Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal

Phenotypes
neurodevelopmental disorder, MONDO:0700092; epilepsy, MONDO:0005027

Publications

• 38423010