Epilepsy Gene Implicated in Severe Migraine Disorder

Northwestern Medicine scientists have discovered that mutations in a critical brain gene—previously linked to epilepsy and autism—are also a cause of a rare, complex form of migraine. The study, published in the journal Brain, expands our understanding of how genetic variations disrupt brain signaling.

A Distinct Feature: Temporary Paralysis

The study focused on Familial Hemiplegic Migraine (FHM), a severe type of migraine marked by temporary weakness or paralysis on one side of the body (hemiplegia) before the headache begins.

Because these neurological symptoms are so pronounced, they can initially mimic a stroke. While the condition runs in families, previously known genetic mutations explained fewer than 20% of genetically diagnosed cases, leaving the vast majority of patients without answers.

Unmasking the SCN2A Gene

To track down the missing genetic causes, an international research team analyzed four generations of a single family affected by hemiplegic migraine. They used whole-genome linkage analysis and targeted exome sequencing to pinpoint the culprit.

Their search pointed directly to a gene called SCN2A. This gene is responsible for encoding Nav1.2, a vital voltage-gated sodium channel that acts as a crucial component for electrical signaling between brain cells. When the team expanded their search to nearly 600 unrelated migraine patients, they uncovered two more rare mutations in the exact same gene.

Why Brain Cells Overfire

To find out how these variations trigger migraines, scientists conducted electrophysiological recording experiments and computer simulations on the mutant channels. They discovered that the genetic flaws fundamentally alter how the channels respond to voltage and how quickly they activate and inactivate. The findings suggest that these specific mutations selectively disrupt brain activity, predisposing individuals to hemiplegic migraine attacks without causing broader, long-term neurological impairment.

A Global Effort for Better Treatment

The SCN2A gene is already well-known in neurology; different mutations on this single gene can produce a wide range of neurological findings, ranging from infant epilepsy to autism spectrum disorder. This study adds hemiplegic migraine to that list, reinforcing the idea that migraines are fundamentally disorders of brain excitability.

The discovery was a massive collaborative effort led by Dr. George’s lab alongside Dr. Anne Ducros from the University of Montpellier in France, who headed the genetic mapping.

Ultimately, these findings are a major step forward for patient care. They are expected to improve genetic diagnosis and counseling for affected families, while adding momentum to efforts to understand migraines at a molecular level—knowledge that could ultimately inform new targeted therapies.

Source: Northwestern Medicine | April 16, 2026