Whistler, Toni, Taylor, Renee, Craddock, R Cameron et al. · Pharmacogenomics · 2006 · DOI
Researchers examined blood samples from hundreds of people to find which genes are connected to fatigue in ME/CFS. They looked at over 20,000 genes and found that 839 of them showed a relationship with fatigue levels. Many of these genes are involved in energy production and metabolism in the body, though about half of the genes they found don't yet have clear functions identified.
This work provides molecular-level evidence that fatigue in ME/CFS correlates with specific patterns of gene expression, particularly in energy metabolism pathways. Identifying these genetic correlates could eventually lead to better diagnostic markers and targeted treatments for this debilitating illness.
This study demonstrates correlation between gene expression and fatigue, not causation—it does not establish that altered expression of these genes directly causes fatigue or ME/CFS. The cross-sectional design cannot determine whether gene expression changes are primary drivers of disease or secondary consequences of illness. Additionally, findings require validation in independent cohorts before clinical application.
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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Primary citation
Whistler, Toni, Taylor, Renee, Craddock, R Cameron, Broderick, Gordon, Klimas, Nancy, & Unger, Elizabeth R (2006). Gene expression correlates of unexplained fatigue.. Pharmacogenomics. https://doi.org/10.2217/14622416.7.3.395
BibTeX
@article{mecfsatlas-whistler-2006-gene-expression,
author = {Whistler, Toni and Taylor, Renee and Craddock, R Cameron and Broderick, Gordon and Klimas, Nancy and Unger, Elizabeth R},
title = {Gene expression correlates of unexplained fatigue.},
journal = {Pharmacogenomics},
year = {2006},
doi = {10.2217/14622416.7.3.395},
note = {PubMed: 16610950},
url = {https://www.mecfsatlas.com/evidence/whistler-2006-gene-expression},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-30. https://www.mecfsatlas.com/evidence/whistler-2006-gene-expression
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