Familial Hemiplegic Migraine Type 3 (FHM3) With an SCN1A Mutation in a Chinese Family: A Case Report

Abstract

Familial hemiplegic migraine (FHM) is a rare, monogenic, autosomal dominant subtype of migraine, in which three genes, <i>CACNA1A, ATP1A2</i>, and <i>SCN1A</i>, are currently known to be involved. The familial hemiplegic migraine type 3 (FHM3) is seldom caused by mutations in <i>SCN1A</i>. Here, we report a rare case of an <i>SCN1A</i> mutation leading to FHM3 in a Chinese family. This case report describes a 62-year-old female patient that was admitted to our clinic. She presented with recurrent attacks of hemiplegic migraine. Her symptoms were first suspicious of a transient ischemic attack (TIA), but they were eventually diagnosed as FHM with a c.4495T>C mutation being found in the <i>SCN1A</i> gene. This case highlights that when a patient presents at the clinic with TIA symptoms associated with migraine, the diagnosis of an FHM should be considered and a genetic test is indicated. The identification of <i>SCN1A</i> gene mutations may help us to further understand the FHM pathophysiology.