SCN2A variants are associated with familial and sporadic hemiplegic migraine

Familial hemiplegic migraine (FHM) is a severe autosomal dominant subtype of migraine with aura, characterized by transient motor weakness during attacks. Known genes (CACNA1A, ATP1A2, SCN1A, PRRT2) account for fewer than 20% of genetically diagnosed cases. To identify novel genetic contributors to FHM, we performed whole-genome linkage analysis and partial exome sequencing in a four-generation pedigree. A candidate ion channel gene (SCN2A) was subsequently screened in six additional pedigrees w