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Major Depressive Disorder · Journal article
Gut Microbes · August 21, 2026
Encouraging direction, but not yet definitive.
This multicenter observational study of 1,269 participants identifies Eggerthella and Hungatella as taxa with evidence for potential causal contribution to MDD using data-driven causal inference methods. The findings replicate previously reported microbiota–depression associations and persist independent of antidepressant medication and body mass index, but causal claims derive from computational analysis of cross-sectional data rather than experimental intervention.
Multicenter observational cohort study with data-driven causal inference analysis. 1,269 MDD patients and healthy controls with microbiome data and in-depth diagnostic assessment for MDD.. Intervention: None; observational study of gut microbiota composition in relation to MDD diagnosis.. Compared with: Healthy controls versus MDD patients.. n = 1,269. Multicenter study; specific centres and countries not stated in source..
Significant difference in relative abundance of four taxa between healthy controls and MDD patients: Eggerthella, Hungatella, Coprobacillus, and Lachnospiraceae FCS020 Data-driven causal inference identified Eggerthella and Hungatella as potential causal contributors to MDD Potential causal effects of Eggerthella and Hungatella on MDD persist beyond the influence of body mass index, suggesting two distinct potential causal pathways
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These findings suggest specific gut bacteria may contribute to depression pathophysiology in humans, potentially opening new mechanistic targets for treatment. However, the cross-sectional design precludes definitive causal claims; intervention studies are needed before clinical application.
A large, well-characterized observational cohort with rigorous causal inference methods identifies specific taxa associated with MDD, but causal claims rest on computational inference from cross-sectional data rather than experimental validation.
As stated by the source record.
Quoted from the source exactly as published.
These findings suggest specific gut bacteria may contribute to depression pathophysiology in humans, potentially opening new mechanistic targets for treatment. However, the cross-sectional design precludes definitive causal claims; intervention studies are needed before clinical application.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
Major Depressive Disorder (MDD) is a highly prevalent, severe mental health condition that constitutes one of the leading causes of disability worldwide. While recent animal studies suggest a causal role of the gut microbiome in the pathophysiology of MDD models, evidence in humans is still unclear due to small sample sizes, inconsistent clinical assessment of MDD diagnosis, and methodological limitations regarding causal inference in cross-sectional data. Here, we explicitly address these shortcomings to investigate the potential causal link between the gut microbiome and MDD: First, we replicate previously reported microbiome-depression associations using one of the largest multicenter MDD cohorts for which microbiome data and in-depth diagnostic assessment are available (N = 1,269 MDD patients and controls). We find a significant difference between healthy controls and MDD patients for the relative abundance of four taxa: Eggerthella, Hungatella, Coprobacillus, and Lachnospiraceae FCS020. Second, we employ state-of-the-art, fully data-driven causal inference tools within Judea Pearl's framework, allowing us to derive model constraints from the data rather than relying on potentially strong, unrealistic assumptions. Using this approach, we found evidence for Eggerthella and Hungatella as potential causal contributors to MDD. Furthermore, we show that the potential causal effects of Eggerthella and Hungatella on MDD persist beyond the influence of body mass index, revealing two distinct potential causal pathways linking the gut microbiome to MDD. Finally, the difference in relative abundance of these taxa between healthy and MDD patients was independent of antidepressant medication. Our study provides the first data-driven evidence for a potential causal role of gut microbiota in the pathophysiology of depression in humans.
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