SCN8A mutations in Chinese children with early onset epilepsy and intellectual disability

Epilepsia
Weijing KongYuwu Jiang

Abstract

Mutations in SCN8A, a voltage-gated sodium-channel type VIII alpha subunit gene, have recently been recognized as one of the pathogenic mechanisms leading to epilepsy and intellectual/developmental disabilities (IDDs). The aim of this study was to detect SCN8A mutations in Chinese patients with epilepsy of unknown etiology and ID/DD. We used targeted next-generation sequencing to identify SCN8A mutations in Chinese patients with epilepsy of unknown etiology and IDDs. A filter process was performed to prioritize rare variants of potential functional significance. Sanger sequencing confirmed the variants and determined the parental origin. We followed all patients with SCN8A mutations in our cohort and analyzed their clinical data. Five de novo SCN8A mutations were identified, including four novel mutations (p.Ala890Thr, p.Leu407Phe, p.Arg850Gln, and p.Ser1596Cys) and one reported (p.Arg1617Gln). Polyphen2 and SIFT software predicted that all five mutations probably damaged Nav1.6 protein function; Mutation Taster indicated that all mutations were disease-causing. Three of these five patients were controlled well by sodium channel blockers (SCBs). Two of these three patients remained seizure free for 6 and 1.5 months, respectivel...Continue Reading

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