De novo SCN8A and inherited rare CACNA1H variants associated with severe developmental and epileptic encephalopathy.

ABSTRACT: Developmental and epileptic encephalopathies (DEEs) are a group of severe epilepsies that are characterized by seizures and developmental delay. DEEs are primarily attributed to genetic causes and an increasing number of cases have been correlated with variants in ion channel genes. In this study, we report a child with an early severe DEE. Whole exome sequencing showed a de novo heterozygous variant (c.4873-4881 duplication) in the SCN8A gene and an inherited heterozygous variant (c.952G > A) in the CACNA1H gene encoding for Na_v1.6 voltage-gated sodium and Ca_v3.2 voltage-gated calcium channels, respectively. In vitro functional analysis of human Na_v1.6 and Ca_v3.2 channel variants revealed mild but significant alterations of their gating properti

SUBMITTER: Stringer RN 

PROVIDER: S-EPMC8365958 | biostudies-literature | 2021 Aug

REPOSITORIES: biostudies-literature