Cerebrospinal fluid metabolomics, lipidomics and serine pathway dysfunction in myalgic encephalomyelitis/chronic fatigue syndroome (ME/CFS).
Baraniuk, James N · Scientific reports · 2025 · DOI
Quick Summary
Researchers studied brain fluid from ME/CFS patients to understand what goes wrong with how their brains use energy. They found that ME/CFS patients have abnormal levels of certain molecules involved in energy production and brain cell function, and these problems got worse after exercise. The study suggests that ME/CFS may involve problems with how the brain processes nutrients and maintains its protective coating around nerve fibers.
Why It Matters
This is the first study to examine CSF metabolomics in ME/CFS post-exercise, providing direct evidence that brain metabolism is fundamentally disrupted in this condition. These findings could lead to objective biomarkers for diagnosis and identify specific metabolic pathways that could become therapeutic targets, offering hope for disease-modifying treatments.
Observed Findings
Elevated serine and reduced 5-methyltetrahydrofolate in ME/CFS cerebrospinal fluid
Disrupted one-carbon pathway with elevated sarcosine but decreased dimethylglycine
Increased phospholipids and sphingomyelins in ME/CFS, suggesting possible myelin dysfunction
Differential response to exercise: lipid consumption in both groups but metabolite depletion only in ME/CFS while controls generated metabolites
Elevated creatine, purine intermediates, and transaconitate (TCA cycle product) in ME/CFS
Inferred Conclusions
ME/CFS involves dysfunction in folate-dependent one-carbon metabolism and serine-phospholipid metabolism in the brain
Postexertional metabolic changes differ fundamentally between ME/CFS patients and controls, suggesting abnormal energy production and recovery after exertion
Abnormalities in sphingomyelins may indicate myelin or white matter dysfunction in ME/CFS
The CSF metabolic profile differs substantially from previously reported plasma findings, indicating compartment-specific pathology
Remaining Questions
Do these CSF metabolic changes correlate with symptom severity, disease duration, or specific symptom clusters like postexertional malaise?
What This Study Does Not Prove
This study does not prove these metabolic changes cause ME/CFS symptoms or establish which changes are primary versus secondary consequences of the disease. The findings are correlative and do not demonstrate causation, and results from CSF may not fully represent whole-body metabolism or symptom mechanisms.