CACNA1A R1347Q: a frequent recurrent mutation in hemiplegic migraine.

Area of Science:

• Genetics
• Neurology
• Molecular Biology

Background:

• Familial hemiplegic migraine type 1 (FHM1) is a rare subtype of migraine with aura.
• Mutations in the CACNA1A gene are a known cause of FHM1.

Purpose of the Study:

• To investigate the genotype-phenotype spectrum of CACNA1A mutations in FHM1.
• To identify recurrent mutations and their clinical significance.

Main Methods:

• Genetic analysis of familial hemiplegic migraine patients.
• Identification and characterization of CACNA1A gene mutations.
• Genotype-phenotype correlation analysis.

Main Results:

• The R1347Q mutation in the CACNA1A gene was identified in six families, including four novel families (two de novo).
• Genotype-phenotype analysis of R1347Q carriers showed a broad clinical spectrum, including hemiplegic migraine with or without ataxia, loss of consciousness, and epilepsy.
• R1347Q is the third most frequent mutation in hemiplegic migraine patients.

Conclusions:

• The R1347Q mutation is a significant contributor to familial hemiplegic migraine.
• Screening for the R1347Q mutation is recommended for clinical diagnosis of FHM1.
• Studying multiple families provides a better understanding of the clinical variability associated with FHM1 mutations.