Fibromyalgia discovered to have a clear neurological origin

Fibromyalgia, a condition affecting approximately 2% of the population and causing widespread pain, fatigue, and mood disturbances, appears to have a distinct neurological origin, according to a significant international genetic study. This finding challenges the prevailing view that it is an autoimmune disease.

The research, published in Nature Medicine and involving 53 scientists from seven countries, analyzed genetic data from over 2.5 million adults across the United States, United Kingdom, Finland, Estonia, Denmark, and Iceland. Of these, 55,000 individuals have fibromyalgia.

Researchers identified variants in DNA sequences across 26 genomic regions that increase the risk of developing fibromyalgia. Crucially, many of the genes within these regions are known to influence the functioning of the brain and the nervous system. This provides the strongest evidence to date that fibromyalgia is predominantly a disorder of the nervous system, rather than an autoimmune condition.

"For decades, patients have been dismissed or told their pain is simply psychological. Our findings confirm that the condition has a clear biological basis," stated Michael Wainberg, a researcher at the University of Toronto and one of the study's authors. Notably, some of the genetic variants most closely linked to fibromyalgia risk are located within the HTT gene, mutations of which cause Huntington's disease, a severe neurodegenerative disorder. Another identified variant affects the GPR52 receptor, which regulates HTT levels and is also being investigated as a potential drug target for Huntington's disease.

Further analysis integrating data from 20 million cells across various tissues reinforced the neurological basis of fibromyalgia. Genes associated with fibromyalgia risk show higher activity in nervous system cells compared to other cell types, distinguishing it from classic autoimmune diseases. The study also revealed significant genetic overlap between fibromyalgia and other conditions, including lower back pain, irritable bowel syndrome, and post-traumatic stress disorder, suggesting shared biological mechanisms.

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For decades, patients have been dismissed or told their pain is simply psychological. Our findings confirm that the condition has a clear biological basis.