Is There a Genetic Test for Migraine?

[Anonymous]

Is There a Genetic Test for Migraine?

[Genetic Counselor]

There is currently no routine genetic test that can reliably diagnose common migraine or predict whether an otherwise healthy person will develop it.
Common migraine is a complex neurological condition influenced by multiple genetic variations, hormonal factors, environmental exposures, and lifestyle influences. Because numerous genes contribute to susceptibility, testing a single gene is generally insufficient to establish or exclude the diagnosis.

Migraine is therefore usually diagnosed clinically. A healthcare professional assesses the patient’s headache characteristics, frequency, duration, associated symptoms, medical history, and family history. Symptoms such as nausea, sensitivity to light or sound, and visual disturbances may help support the diagnosis, depending on the clinical presentation.
Although routine genetic testing is not useful for most migraine cases, genetic testing can be appropriate when a rare inherited neurological condition is suspected.
One example is familial hemiplegic migraine, a rare migraine subtype characterised by attacks involving temporary weakness on one side of the body. Some forms are associated with pathogenic variants in genes including CACNA1A, ATP1A2, and SCN1A.

When a person’s symptoms and family history suggest this condition, a neurologist or clinical geneticist may consider targeted genetic testing or an appropriate gene panel. The decision depends on the clinical presentation and the likelihood that testing will clarify the diagnosis.

Another important condition is CADASIL, which stands for cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy. It is an inherited small-vessel disease affecting the brain and is associated with pathogenic variants in the NOTCH3 gene.
can involve migraine, particularly migraine with aura, but it is not simply a genetic form of ordinary migraine. Other features may include early-onset strokes, cognitive decline, and characteristic abnormalities on brain MRI. Genetic testing may be considered when the clinical and family history raises suspicion of CADASIL.
It is important to understand that migraine with aura alone does not automatically indicate an inherited neurological disorder. Most people with migraine with aura do not have CADASIL or a rare single-gene migraine condition.

Genetic testing also has limitations. A negative result does not exclude common migraine, and a variant of uncertain significance may not establish a diagnosis. Results must be interpreted alongside clinical findings and family history.
For this reason, genetic counselling before and after testing can be valuable when an inherited neurological condition is suspected. Counselling helps patients understand what a test can identify, what its limitations are, and what the results may mean for biological relatives.

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