Clinical spectrum of hemiplegic migraine and chances of finding a pathogenic mutation

Neurology. 2018 Feb 13;90(7):e575-e582. doi: 10.1212/WNL.0000000000004966. Epub 2018 Jan 17.

Abstract

Objective: To investigate whether the clinical characteristics of patients with hemiplegic migraine with and without autosomal dominant mutations in CACNA1A, ATP1A2, or SCN1A differ, and whether the disease may be caused by mutations in other genes.

Methods: We compared the clinical characteristics of 208 patients with familial (n = 199) or sporadic (n = 9) hemiplegic migraine due to a mutation in CACNA1A, ATP1A2, or SCN1A with those of 73 patients with familial (n = 49) or sporadic (n = 24) hemiplegic migraine without a mutation in these genes. In addition, 47 patients (familial: n = 33; sporadic: n = 14) without mutations in CACNA1A, ATP1A2, or SCN1A were scanned for mutations in novel genes using whole exome sequencing.

Results: Patients with mutations in CACNA1A, ATP1A2, or SCN1A had a lower age at disease onset, larger numbers of affected family members, and more often attacks (1) triggered by mild head trauma, (2) with extensive motor weakness, and (3) with brainstem features, confusion, and brain edema. Mental retardation and progressive ataxia were exclusively found in patients with a mutation. Whole exome sequencing failed to identify pathogenic mutations in new genes.

Conclusions: Most patients with hemiplegic migraine without a mutation in CACNA1A, ATP1A2, or SCN1A display a mild phenotype that is more akin to that of common (nonhemiplegic) migraine. A major fourth autosomal dominant gene for hemiplegic migraine remains to be identified. Our observations might guide physicians in selecting patients for mutation screening and in providing adequate genetic counseling.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Age of Onset
  • Calcium Channels / genetics
  • Child
  • Female
  • Genetic Association Studies
  • Genetic Predisposition to Disease
  • Humans
  • Male
  • Migraine with Aura / epidemiology
  • Migraine with Aura / genetics*
  • Migraine with Aura / physiopathology
  • Mutation*
  • NAV1.1 Voltage-Gated Sodium Channel / genetics
  • Phenotype
  • Sodium-Potassium-Exchanging ATPase / genetics
  • Whole Exome Sequencing

Substances

  • CACNA1A protein, human
  • Calcium Channels
  • NAV1.1 Voltage-Gated Sodium Channel
  • SCN1A protein, human
  • ATP1A2 protein, human
  • Sodium-Potassium-Exchanging ATPase