fMRI Insights into Visual Cortex Dysfunction as a Biomarker for Migraine with Aura

Area of Science:

• Neurology
• Neuroscience
• Genetics

Background:

• Migraine with aura (MwA) is a disabling neurological disorder characterized by recurrent visual disturbances.
• The underlying pathophysiology of MwA remains incompletely understood, though cortical spreading depression (CSD) is implicated.

Purpose of the Study:

• To synthesize current knowledge on the pathophysiology of MwA.
• To analyze molecular and neurophysiological targets for developing new therapies.

Main Methods:

• Review of molecular, genetic, and neuroimaging studies, including functional magnetic resonance imaging (fMRI) and arterial spin labelling (ASL).
• Analysis of ion channel dysfunction, calcium channel gene families (e.g., CACNA), and glutamate release.

Main Results:

• CSD is a central mechanism in MwA, triggered by ion channel dysfunction and leading to cortical hyperexcitability.
• Neuroimaging reveals enduring cortical dysfunction beyond aura episodes, with specific visual cortex activation patterns potentially serving as a biomarker.
• MwA is multifactorial, influenced by cortical, vascular, and genetic factors.

Conclusions:

• Advances in molecular, genetic, and neuroimaging research have significantly improved understanding of MwA pathophysiology.
• Targeting cortical excitability and neural network stability offers a foundation for developing novel MwA therapies.
• Further research into molecular and neurophysiological targets is crucial for alleviating the burden of migraine with aura.