Researchers have identified rare SCN2A mutations linked to Familial Hemiplegic Migraine (FHM), a severe genetic disorder characterized by temporary one-sided paralysis during attacks. This finding broadens understanding of the condition, for which existing gene explanations account for less than 20% of diagnosed cases.
Investigators screened multiple families and sporadic cases, identifying a heterozygous missense mutation in SCN2A that co-segregated with FHM in one family. Further variants were found in a second family and one sporadic case, all absent from the general population database. Individuals with SCN2A variants experienced typical hemiplegic migraine symptoms beginning in childhood.
These findings suggest SCN2A should be included in genetic testing for FHM and similar disorders. Earlier molecular diagnosis could improve patient counseling, family screening, and management planning, potentially benefiting selected patients with this disabling migraine syndrome.