Evidence map›Paper›PMID 34047485›Full record

SynthesisBrain and behavior2021

Gut microbiota variations in patients diagnosed with major depressive disorder-A systematic review.

Julie Kristine Knudsen, Caspar Bundgaard-Nielsen, Simon Hjerrild, René Ernst Nielsen, Peter Leutscher, Suzette Sørensen

Abstract readSystematic Review
In one paragraph

Synthesis in Brain and behavior, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 60 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
60citing papers in PubMed, 2 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

60 citing papers in PubMed, 2 syntheses or guidelines pooled it.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors.

Julie Kristine KnudsenCentre for Clinical Research, North Denmark Regional Hospital, Hjoerring, Denmark.ORCID 0000-0002-5528-3592
Caspar Bundgaard-NielsenCentre for Clinical Research, North Denmark Regional Hospital, Hjoerring, Denmark.ORCID 0000-0002-2700-2378
Simon HjerrildPsychosis Research Unit, Aarhus University Hospital, Aarhus, Denmark.ORCID 0000-0001-6673-2798
René Ernst NielsenDepartment of Clinical Medicine, Aalborg University, Aalborg, Denmark.ORCID 0000-0002-7982-6352
Peter LeutscherCentre for Clinical Research, North Denmark Regional Hospital, Hjoerring, Denmark.ORCID 0000-0002-6742-8939
Suzette SørensenCentre for Clinical Research, North Denmark Regional Hospital, Hjoerring, Denmark.ORCID 0000-0002-4201-1168

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

objectiveThe etiology of major depressive disorder (MDD) is multi-factorial and has been associated with a perturbed gut microbiota. Thus, it is therefore of great importance to determine any variations in gut microbiota in patients with MDD.

methodsA systematic literature search was conducted including original research articles based on gut microbiota studies performed in patients with MDD. Demographic and clinical characteristics, applied methodology and observed gut microbiota composition were compared between included studies.

resultsSeventeen studies were included with a total of 738 patients with MDD and 782 healthy controls using different DNA purification methods, sequencing platforms and data analysis models. Four studies found a reduced α-diversity in patients with MDD, while gut microbiota compositions clustered separately according to β-diversity between patients and controls in twelve studies. Additionally, there was an increase in relative abundance of Eggerthella, Atopobium, and Bifidobacterium and a decreased relative abundance of Faecalibacterium in patients with MDD compared with healthy controls.

conclusionGut microbiota differs significantly when comparing patients with MDD and healthy controls, though inconsistently across studies. The heterogeneity in gut microbiota compositions between the studies may be explained by variations in study design.

Indexed as

Gastrointestinal MicrobiomeMajor Depressive DisorderBifidobacteriumHumansResearch Designdepressiongut-brain axismajor depressive disordermicrobiomemicrobiotaunipolar depression

Identifiers

PMID34047485
PMCPMC8323045

What OpenQuestion holds

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.