Vladutiu, Georgirene D, Natelson, Benjamin H · Muscle & nerve · 2004 · DOI
This study looked at a specific gene called ACE that helps control muscle function and found that Gulf War veterans with chronic fatigue had different versions of this gene compared to healthy veterans. Specifically, veterans with a certain genetic pattern (called DD) were much more likely to develop severe, long-lasting fatigue that doctors couldn't easily explain. This suggests that genetics may play a role in who develops ME/CFS, at least in this group of veterans.
This study provides genetic evidence that ME/CFS may have biological roots involving muscle metabolism genes, particularly in individuals exposed to Gulf War stressors. Identifying genetic risk factors could help develop better diagnostic and treatment approaches and may explain why some people develop ME/CFS while others do not.
This study does not prove that the ACE gene directly causes ME/CFS—it only shows an association in Gulf War veterans. The finding does not generalize to all ME/CFS patients, since the association was not found in nonveterans with CFS/ICF. It remains unclear whether this genetic variant is a causal risk factor or merely a marker associated with vulnerability in the context of Gulf War exposure.
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 →
The first block is for the primary paper and is the citation you should use in research work. The atlas-snapshot line only applies if you are specifically referring to this atlas’s reading of the paper on the date shown.
Primary citation
Vladutiu, Georgirene D & Natelson, Benjamin H (2004). Association of medically unexplained fatigue with ACE insertion/deletion polymorphism in Gulf War veterans.. Muscle & nerve. https://doi.org/10.1002/mus.20055
BibTeX
@article{mecfsatlas-vladutiu-2004-association-medically,
author = {Vladutiu, Georgirene D and Natelson, Benjamin H},
title = {Association of medically unexplained fatigue with ACE insertion/deletion polymorphism in Gulf War veterans.},
journal = {Muscle & nerve},
year = {2004},
doi = {10.1002/mus.20055},
note = {PubMed: 15221876},
url = {https://www.mecfsatlas.com/evidence/vladutiu-2004-association-medically},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-25. https://www.mecfsatlas.com/evidence/vladutiu-2004-association-medically
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