Ojima, Kiyomi, Watanabe, Nagaoki, Narita, Naoko et al. · BioPsychoSocial medicine · 2007 · DOI
This study looked at a specific genetic variation in the serotonin transporter gene in people with temporomandibular disorder (TMD)—a condition affecting the jaw joint. Researchers compared the genes of 36 patients with TMD to healthy controls and found that people with TMD were more likely to carry certain genetic variants related to serotonin, a chemical messenger in the brain. Since serotonin problems have been linked to chronic fatigue syndrome and similar conditions, this finding suggests genetics may play a role in TMD development.
This research is relevant to ME/CFS patients because both TMD and ME/CFS involve serotonin dysregulation and are classified as functional somatic symptom disorders. Understanding the genetic basis of serotonin-related conditions may help identify shared biological mechanisms between these overlapping disorders. Genetic insights could eventually inform patient stratification and targeted treatment approaches.
This study does not prove that the serotonin transporter gene variant causes TMD—it only shows an association in this Japanese population. The findings cannot be generalized to other ethnic groups without replication studies. Association does not establish causation; the genetic variant may be a risk factor or marker for TMD rather than a direct cause.
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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