Cited by 160Gut microbiota and healthTryptophan and brain disordersGastrointestinal motility and disorders

Gutted! Unraveling the Role of the Microbiome in Major Depressive Disorder

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Bastiaanssen, Thomaz F. S., Cussotto, Sofia, Claesson, Marcus J., Clarke, Gerard, Dinan, Timothy G., Cryan, John F.·2020·Harvard Review of Psychiatry

Abstract

Microorganisms can be found in virtually any environment. In humans, the largest collection of microorganisms is found in the gut ecosystem. The adult gut microbiome consists of more genes than its human host and typically spans more than 60 genera from across the taxonomic tree. In addition, the gut contains the largest number of neurons in the body, after the brain. In recent years, it has become clear that the gut microbiome is in communication with the brain, through the gut–brain axis. A growing body of literature shows that the gut microbiome plays a shaping role in a variety of psychiatric disorders, including major depressive disorder (MDD). In this review, the interplay between the microbiome and MDD is discussed in three facets. First, we discuss factors that affect the onset/development of MDD that also greatly impinge on the composition of the gut microbiota—especially diet and stressful life events. We then examine the interplay between the microbiota and MDD. We examine evidence suggesting that the microbiota is altered in MDD, and we discuss why the microbiota should be considered during MDD treatment. Finally, we look toward the future and examine how the microbiota might become a therapeutic target for MDD. This review is intended to introduce those familiar with the neurological and psychiatric aspects of MDD to the microbiome and its potential role in the disorder. Although research is in its very early days, with much yet to be the understood, the microbiome is offering new avenues for developing potentially novel strategies for managing MDD.

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Crossref · 10.1097/hrp.0000000000000243

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165 of 165 references verified0 citation errors · 0 not checkable

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Authors
Bastiaanssen, T. F. S., Cussotto, S., Claesson, M. J., Clarke, G., Dinan, T. G., & Cryan, J. F.
Affiliations
University College Cork (IE)
Corresponding author
  • Bastiaanssen, Thomaz F. S.
  • Cussotto, Sofia
Venue
Harvard Review of Psychiatry
Published
2020-01
Volume
28
Issue
1
Pages
26-39
ISSN
  • 1067-3229 (ISSN-L)
  • 1465-7309
OpenAlex
W3000033244
Cited by
159
References
165
Citations by year
2026: 12 · 2025: 17 · 2024: 23 · 2023: 30 · 2022: 23 · 2021: 28 · 2020: 25 · 2017: 1
FWCI
2.54
Type
journal article
Language
en
Open access
Locations
  • Harvard Review of Psychiatry (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Science Foundation Ireland (SFI/12/RC/, 12/RC/2273, 12/RC/, SFI/12/RC/2273.)
  • APC Microbiome Institute (SFI/12/RC/2273)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
  • Life Sciences › Neuroscience › Biological Psychiatry › Tryptophan and brain disorders
  • Health Sciences › Medicine › Gastroenterology › Gastrointestinal motility and disorders
Keywords
gut microbiota, major depressive disorder, gut-brain axis, diet, life events, microbiota alterations, depression treatment, microbiota-targeted therapy, mental illness
MeSH terms
Gastrointestinal Microbiome, Animals, Brain, Depressive Disorder, Major, Major Depressive Disorder, Humans, Probiotics, Gastrointestinal Tract

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