Cited by 506Gut microbiota and healthTryptophan and brain disordersGastrointestinal motility and disorders

A systematic review of gut microbiota composition in observational studies of major depressive disorder, bipolar disorder and schizophrenia

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McGuinness, A. J., Davis, J. A., Dawson, S. L., Loughman, A., Collier, F., O’Hely, M., Simpson, C. A., Green, J. +8 more·2022·Molecular Psychiatry

Abstract

The emerging understanding of gut microbiota as ‘metabolic machinery’ influencing many aspects of physiology has gained substantial attention in the field of psychiatry. This is largely due to the many overlapping pathophysiological mechanisms associated with both the potential functionality of the gut microbiota and the biological mechanisms thought to be underpinning mental disorders. In this systematic review, we synthesised the current literature investigating differences in gut microbiota composition in people with the major psychiatric disorders, major depressive disorder (MDD), bipolar disorder (BD) and schizophrenia (SZ), compared to ‘healthy’ controls. We also explored gut microbiota composition across disorders in an attempt to elucidate potential commonalities in the microbial signatures associated with these mental disorders. Following the PRISMA guidelines, databases were searched from inception through to December 2021. We identified 44 studies (including a total of 2510 psychiatric cases and 2407 controls) that met inclusion criteria, of which 24 investigated gut microbiota composition in MDD, seven investigated gut microbiota composition in BD, and 15 investigated gut microbiota composition in SZ. Our syntheses provide no strong evidence for a difference in the number or distribution (α-diversity) of bacteria in those with a mental disorder compared to controls. However, studies were relatively consistent in reporting differences in overall community composition (β-diversity) in people with and without mental disorders. Our syntheses also identified specific bacterial taxa commonly associated with mental disorders, including lower levels of bacterial genera that produce short-chain fatty acids (e.g. butyrate), higher levels of lactic acid-producing bacteria, and higher levels of bacteria associated with glutamate and GABA metabolism. We also observed substantial heterogeneity across studies with regards to methodologies and reporting. Further prospective and experimental research using new tools and robust guidelines hold promise for improving our understanding of the role of the gut microbiota in mental and brain health and the development of interventions based on modification of gut microbiota.

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  1. [10]Van Oudenhove L Crowell MD Drossman DA Halpert AD Keefer L Lackner JM Biopsychosocial Aspects of Functional Gastrointestinal Disorders Gastroenterology. 2016 150 1355 67 PMC8809487 27144624
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Authors
McGuinness, A. J., Davis, J. A., Dawson, S. L., Loughman, A., Collier, F., O’Hely, M., Simpson, C. A., Green, J., Marx, W., Hair, C., Guest, G., Mohebbi, M., Berk, M., Stupart, D., Watters, D., & Jacka, F. N.
Affiliations
  • Barwon Health (AU)
  • The University of Melbourne (AU)
  • Deakin University (AU)
Corresponding author
Jacka, F. N.
Venue
Molecular Psychiatry
Published
2022-02-22
Volume
27
Issue
4
Pages
1920-1935
ISSN
  • 1359-4184 (ISSN-L)
  • 1476-5578
OpenAlex
W4213219820
Cited by
502
References
166
Citations by year
2026: 88 · 2025: 133 · 2024: 130 · 2023: 100 · 2022: 51
FWCI
10.78
Type
journal article
Language
en
Open access
Locations
  • Molecular Psychiatry (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • ResearchOnline at James Cook University (James Cook University) (submittedVersion)
  • Deakin Research Online (Deakin University) (submittedVersion)
  • Figshare (submittedVersion, cc-by)
  • Minerva Access (University of Melbourne) (submittedVersion, cc-by)
Funders
  • Pfizer
  • PA Research Foundation
  • Clifford Craig Foundation
  • Jack Brockhoff Foundation
  • Australian Government
  • European Space Agency
  • Bond University
  • Multiple Sclerosis Australia
  • Australian Academy of Science
  • Australian Rotary Health (1156072)
  • Beyond Blue
  • La Trobe University
  • Deakin University (1156072)
  • RMIT University
  • University of Melbourne (1156072)
  • Swisse Wellness
  • Servier
  • H. Lundbeck A/S
  • Epilepsy Society
  • National Institutes of Health
  • Allergan
  • Medical Research Council
  • National Health and Medical Research Council (1194982, 1156072)
  • Cancer Council Queensland
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, bipolar disorder, schizophrenia, microbial diversity, short-chain fatty acids, butyrate, lactic acid bacteria, glutamate metabolism, GABA metabolism, mental illness, microbial signatures
MeSH terms
Gastrointestinal Microbiome, Bipolar Disorder, Brain, Depressive Disorder, Major, Major Depressive Disorder, Humans, Schizophrenia

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