Epigenetic reprograming in myalgic encephalomyelitis/chronic fatigue syndrome: A narrative of latent viruses.
Apostolou, Eirini, Rosén, Anders · Journal of internal medicine · 2024 · DOI
Quick Summary
This review examines how viruses, particularly Epstein-Barr virus, may cause lasting changes to how our cells work in ME/CFS patients. The authors found that in about 70% of ME/CFS cases, the illness begins after a viral infection, and viruses can hide in the body while triggering long-term problems with energy, thinking, and immune function. Understanding these viral-triggered changes could help explain why different patients experience ME/CFS differently and may lead to better treatments.
Why It Matters
This work provides a mechanistic framework linking viral infections to the multi-system dysfunction observed in ME/CFS, which could guide research toward epigenetic biomarkers and targeted interventions. Understanding how viruses manipulate cellular regulation may reveal why ME/CFS symptoms persist long after acute infection and why some patients deteriorate with exertion. This knowledge is particularly relevant given the overlaps between ME/CFS and long COVID.
Observed Findings
Approximately 70% of ME/CFS cases follow a major stressor involving viral infection
Epigenetic alterations in ME/CFS affect immune responses, cellular metabolism, cell death/proliferation, and neuronal/endothelial function
Latent herpesviruses, particularly Epstein-Barr virus, employ epigenetic regulation strategies for persistence and immune evasion
Clinical and symptom overlap exists between ME/CFS and long COVID
Physiological variations among ME/CFS patients correlate with environmental triggers and altered viral activity patterns
Inferred Conclusions
Latent herpesvirus-driven epigenetic reprogramming may be a key mechanism underlying persistent ME/CFS pathology
Epigenetic signatures in ME/CFS reflect the dynamic interaction between viral persistence strategies and host immune responses
Epigenetic biomarkers could help identify relevant biological pathways affected in ME/CFS and potentially stratify patient heterogeneity
Future epigenetic research may elucidate why symptoms persist despite immune activation and could inform therapeutic targeting
Remaining Questions
Which specific epigenetic modifications are causally linked to ME/CFS symptoms versus secondary consequences of chronic illness?
What This Study Does Not Prove
This narrative review does not establish definitive causal relationships between specific viruses and ME/CFS—it synthesizes existing evidence without new experimental data. It does not prove that viral reactivation occurs in all ME/CFS patients or that targeting viral epigenetic mechanisms will reverse symptoms. The review cannot determine whether observed epigenetic changes are primary causes of ME/CFS or secondary consequences of systemic illness.
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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