Headaches are a pain — literally. But while most people see them as a temporary nuisance, many others find them extremely debilitating. For the 8% of men and 17% of women who suffer from migraine headaches, these long, recurring episodes can include more than just throbbing pain: vomiting, chills, sensitivity to light or sound, or trouble concentrating are just a few of the possible symptoms. Some people experience a set of symptoms prior to their migraine attacks known as “aura” but for others the attacks come without warning.
Because the condition is complex and manifests differently in each person, the biological causes of migraine have been difficult to determine. New research, however, is implicating common genetic variants which may help to elucidate the biological underpinnings of the disease.
In a study published this week in Nature Genetics, a team of scientists from the International Headache Genetics Consortium (IHGC) identified a SNP associated with migraine susceptibility. The researchers compared almost 6,000 migraine sufferers to more than 50,000 people who did not suffer from migraines, all of European ancestry, and found that the less common A version of rs1835740 was associated with about 1.2 times higher odds of migraine headache.
(23andMe customers can check their data for rs1835740 using the Browse Raw Data feature. Note that we report “C” and “T” for rs1835740, where T corresponds to the less common A version.)
Although rs1835740 is not located within any known genes, it is found in a region of the genome that contains genes involved in the regulation of a neurotransmitter called glutamate. When the IHGC team looked at the nearby genes, they observed that rs1835740 was significantly correlated with the expression levels of MTDH. MTDH regulates another gene that encodes a protein that transports glutamate in the brain. Previous research has suggested that an imbalance in glutamate levels may contribute to the development of migraines, in addition to other neurological disorders, but the exact mechanisms are still unknown. More studies are needed to confirm and elaborate on the IHGC’s findings.
SNPwatch gives you the latest news about research linking various traits and conditions to individual genetic variations. These studies are exciting because they offer a glimpse into how genetics may affect our bodies and health; but in most cases, more work is needed before this research can provide information of value to individuals. For that reason it is important to remember that like all information we provide, the studies we describe in SNPwatch are for research and educational purposes only. SNPwatch is not intended to be a substitute for professional medical advice; you should always seek the advice of your physician or other appropriate healthcare professional with any questions you may have regarding diagnosis, cure, treatment or prevention of any disease or other medical condition.