What is the genetic cause of familial hemiplegic migraine (FHM) type 3?

Updated: Oct 21, 2019
  • Author: Jasvinder Chawla, MD, MBA; Chief Editor: Helmi L Lutsep, MD  more...
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FHM type 3 is caused by mutations in the SCN1A gene, located on 2q24. Mutations in SCN1A are also known to cause familial febrile seizure disorders and infantile epileptic encephalopathy. [38] Although SCN1A mutation has been reported in several unrelated families, it is felt to be a rare cause of FHM. [39]

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