Smith, Alicia K, Dimulescu, Irina, Falkenberg, Virginia R et al. · Psychoneuroendocrinology · 2008 · DOI
This study looked at genes related to serotonin (a brain chemical) to see if certain genetic variations are more common in people with ME/CFS. Researchers compared 40 ME/CFS patients with 97 control subjects and found that specific genetic markers in the HTR2A gene were associated with ME/CFS and with severity of fatigue and disability. These genetic variations may increase how active the serotonin system is in the brain, which could play a role in ME/CFS.
This study identifies specific genetic variations in the serotonin system that may contribute to ME/CFS susceptibility and symptom severity, offering a potential molecular basis for understanding CNS dysfunction in this condition. If replicated, these findings could guide development of targeted therapies and improve understanding of why ME/CFS affects the brain's chemical signaling systems.
This study does not prove that HTR2A gene variants cause ME/CFS—only that they are associated with it. Genetic association does not establish causation or explain how much of ME/CFS risk these variants account for. The results require independent replication in larger, diverse populations before clinical application.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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