Buchwald, D, Herrell, R, Ashton, S et al. · Psychosomatic medicine · 2001 · DOI
This study looked at whether chronic fatigue runs in families by comparing identical twins to fraternal twins. Researchers found that identical twins were more likely to both have chronic fatigue than fraternal twins, suggesting that genes play a role in who develops the condition. The findings suggest that genetics may account for about half of the reason some people develop chronic fatigue syndrome.
This work provides early evidence that genetic factors contribute to chronic fatigue syndrome development, helping shift the understanding of ME/CFS from a purely psychological condition to one with biological underpinnings. Demonstrating genetic influence supports the legitimacy of ME/CFS as a disease with inherited vulnerability and may encourage research into specific genetic mechanisms and gene-environment interactions.
This study does not identify which specific genes are involved or prove that fatigue is primarily genetic—environmental factors appear equally or more important. It also does not establish causation or explain what environmental triggers interact with genetic predisposition, and the all-female sample limits generalizability to males.
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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