Changes in the transcriptome of circulating immune cells of a New Zealand cohort with myalgic encephalomyelitis/chronic fatigue syndrome.
Sweetman, Eiren, Ryan, Margaret, Edgar, Christina et al. · International journal of immunopathology and pharmacology · 2019 · DOI
Quick Summary
Researchers studied blood immune cells from 10 ME/CFS patients and 10 healthy people to understand what's different at the genetic level. They found that several genes related to inflammation were more active in ME/CFS patients, and genes related to energy production and circadian rhythms (your body's internal clock) showed abnormal patterns. These findings suggest ME/CFS involves multiple biological systems working incorrectly at the same time.
Why It Matters
This study identifies specific molecular abnormalities in ME/CFS immune cells, providing biological evidence that ME/CFS involves real, measurable changes in gene expression. These findings support the recognition of ME/CFS as an organic disease with identifiable biological markers, potentially advancing diagnosis and treatment development.
Observed Findings
27 gene transcripts were increased 1.5- to sixfold in ME/CFS patients compared to controls
6 gene transcripts were decreased three- to sixfold in ME/CFS patients
IL8 and NFΚBIA upregulation was confirmed by qPCR validation
Gene expression changes were functionally related to inflammation, circadian dysfunction, metabolic dysregulation, cellular stress, and mitochondrial dysfunction
Stress and inflammation pathways were significantly dysregulated by pathway analysis
Inferred Conclusions
ME/CFS involves dysregulation of inflammatory pathways, with elevated expression of genes controlling inflammatory responses
Circadian clock dysfunction and metabolic dysregulation are interconnected with inflammatory changes in ME/CFS
Mitochondrial dysfunction and cellular stress responses appear to be part of a larger network of abnormalities in ME/CFS
Multiple biological systems are simultaneously dysregulated in ME/CFS rather than a single pathway being affected
Remaining Questions
Do these gene expression changes differ between ME/CFS patients with different symptom profiles or disease severity?
What This Study Does Not Prove
This study does not prove that these gene expression changes cause ME/CFS—they may be consequences of the illness rather than causes. The small sample size (20 participants total) means findings require replication in larger, more diverse populations before they can be considered definitive. The study also cannot determine whether these changes are temporary, reversible, or stable over time.