Germain, Arnaud, Levine, Susan M, Hanson, Maureen R · Proteomes · 2021 · DOI
Researchers measured 4,790 different proteins in the blood of 20 ME/CFS patients and 20 healthy people to look for differences that might explain the disease. They found that 19 proteins were significantly different between the two groups, particularly involving pathways related to immune function and cell communication. Using these protein patterns, they were able to distinguish ME/CFS patients from healthy controls with high accuracy, suggesting proteins in blood could potentially help diagnose ME/CFS.
ME/CFS currently lacks objective biomarkers for diagnosis, relying entirely on symptom-based criteria. This study identifies candidate blood proteins that could form the basis for a diagnostic test and reveals specific biological pathways disrupted in ME/CFS, potentially pointing toward future treatment targets. Understanding the molecular basis of the disease is essential for developing therapies beyond symptom management.
This pilot study does not prove that the identified proteins cause ME/CFS or that measuring them would be practical for routine clinical diagnosis—findings must be validated in larger, more diverse cohorts. The study design cannot establish whether proteomic changes are primary disease drivers or secondary consequences of illness. The study is limited to females and cannot confirm whether findings generalize to male ME/CFS patients.
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
Germain, Arnaud, Levine, Susan M, & Hanson, Maureen R (2021). In-Depth Analysis of the Plasma Proteome in ME/CFS Exposes Disrupted Ephrin-Eph and Immune System Signaling.. Proteomes. https://doi.org/10.3390/proteomes9010006
BibTeX
@article{mecfsatlas-germain-2021-depth-analysis,
author = {Germain, Arnaud and Levine, Susan M and Hanson, Maureen R},
title = {In-Depth Analysis of the Plasma Proteome in ME/CFS Exposes Disrupted Ephrin-Eph and Immune System Signaling.},
journal = {Proteomes},
year = {2021},
doi = {10.3390/proteomes9010006},
note = {PubMed: 33572894},
url = {https://www.mecfsatlas.com/evidence/germain-2021-depth-analysis},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-30. https://www.mecfsatlas.com/evidence/germain-2021-depth-analysis
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