The primary headaches: genetics, epigenetics and a behavioural genetic model.

Area of Science:

• Neurology
• Genetics
• Behavioral Science

Background:

• Primary headaches, including migraine with aura (MA), migraine without aura (MO), and cluster headache, exhibit significant genetic components.
• Familial hemiplegic migraine (FHM), a rare autosomal dominant disorder, was previously classified as a subtype of MA, linked to mutations in neural channel genes.

Purpose of the Study:

• To re-evaluate the classification of Familial hemiplegic migraine (FHM) in relation to typical migraines (MA/MO).
• To explore the potential role of epigenetic mechanisms and propose a behavioral model for primary headache pathogenesis.

Main Methods:

• Review of existing genetic studies on FHM and typical migraines.
• Conceptualization of a behavioral model for primary headaches.

Main Results:

• Genetic studies suggest FHM genes are not implicated in typical MA/MO.
• Evidence supports considering FHM as a syndromic migraine, distinct from MA subtypes.
• A hypothesis proposing epigenetic mechanisms in headache pathogenesis is presented.

Conclusions:

• Reclassifying FHM as a syndromic migraine may enhance understanding of migraine pathogenesis.
• A proposed behavioral model construes primary headaches as evolutionarily conserved adaptive behaviors.
• Integrating epigenetic factors and behavioral models could advance migraine genetic research.