Zhang, C, Baumer, A, Mackay, I R et al. · Human molecular genetics · 1995 · DOI
This 1995 study examined muscle tissue from one adult patient with ME/CFS and found an unusual pattern of damaged mitochondrial DNA (the energy-producing structures in our cells). The researchers compared this patient's muscle cells to control samples and discovered deletions—missing pieces—in the mitochondrial DNA that weren't typically seen in healthy people. This finding suggested that energy production problems in muscle cells might contribute to the fatigue experienced by ME/CFS patients.
This early study was among the first to provide direct molecular evidence that mitochondrial dysfunction at the DNA level might contribute to ME/CFS symptoms. Identifying structural abnormalities in the energy-producing machinery of muscle cells supports the biological basis of the illness and could guide future research into targeted treatments addressing cellular energy deficits.
This case report does not prove that mtDNA deletions cause ME/CFS in all patients, as it examined only one individual. It does not establish whether these deletions are a primary cause of illness or a secondary consequence of the disease process. Larger, multi-patient studies are needed to determine how common these abnormalities are and whether they directly cause the fatigue symptoms.
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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