Simonato, Manuela, Dall'Acqua, Stefano, Zilli, Caterina et al. · Biomedicines · 2021 · DOI
This study compared blood samples from 40 people with ME/CFS to 40 healthy people to look for biological differences. Researchers found that ME/CFS patients had different levels of certain molecules related to immune function, gut health, and how the body uses the amino acid tryptophan. These differences were independent of each other, suggesting multiple biological pathways may be disrupted in ME/CFS.
This study supports the hypothesis that ME/CFS involves dysregulation across multiple independent biological systems—immune, intestinal, and metabolic—rather than a single mechanism. Identifying distinct biomarker signatures could enable better patient stratification for personalized treatment approaches and help researchers understand disease heterogeneity.
This cross-sectional study cannot establish causation; the observed biomarker changes may be consequences rather than causes of ME/CFS. The lack of correlation between different biomarker categories does not prove they are completely independent—shared upstream causes could still exist. Results are descriptive and require validation in larger, longitudinal cohorts before informing clinical practice.
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
Simonato, Manuela, Dall'Acqua, Stefano, Zilli, Caterina, Sut, Stefania, Tenconi, Romano, Gallo, Nicoletta, et al. (2021). Tryptophan Metabolites, Cytokines, and Fatty Acid Binding Protein 2 in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome.. Biomedicines. https://doi.org/10.3390/biomedicines9111724
BibTeX
@article{mecfsatlas-simonato-2021-tryptophan-metabolites,
author = {Simonato, Manuela and Dall'Acqua, Stefano and Zilli, Caterina and Sut, Stefania and Tenconi, Romano and Gallo, Nicoletta and Sfriso, Paolo and Sartori, Leonardo and Cavallin, Francesco and Fiocco, Ugo and Cogo, Paola and Agostinis, Paolo and Aldovini, Anna and Bruttomesso, Daniela and Marcolongo, Renzo and Comai, Stefano and Baritussio, Aldo},
title = {Tryptophan Metabolites, Cytokines, and Fatty Acid Binding Protein 2 in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome.},
journal = {Biomedicines},
year = {2021},
doi = {10.3390/biomedicines9111724},
note = {PubMed: 34829952},
url = {https://www.mecfsatlas.com/evidence/simonato-2021-tryptophan-metabolites},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-27. https://www.mecfsatlas.com/evidence/simonato-2021-tryptophan-metabolites
Contribute
Private, reviewed by a human. Not a public comment thread.