Cited by 433Gut microbiota and healthGastrointestinal motility and disordersMicroscopic Colitis

Alterations in composition and diversity of the intestinal microbiota in patients with diarrhea‐predominant irritable bowel syndrome

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Carroll, I. M., Ringel‐Kulka, T., Siddle, J. P., Ringel, Y.·2012·Neurogastroenterology & Motility

Abstract

Background The intestinal microbiota has been implicated in the pathophysiology of irritable bowel syndrome (IBS). Due to the variable resolutions of techniques used to characterize the intestinal microbiota, and the heterogeneity of IBS, the defined alterations of the IBS intestinal microbiota are inconsistent. We analyzed the composition of the intestinal microbiota in a defined subgroup of IBS patients (diarrhea‐predominant IBS, D‐IBS) using a technique that provides the deepest characterization available for complex microbial communities. Methods Fecal DNA was isolated from 23 D‐IBS patients and 23 healthy controls (HC). Variable regions V1–V3 and V6 of the 16S rRNA gene were amplified from all samples. PCR products were sequenced using 454 high throughput sequencing. The composition, diversity and richness of microbial communities were determined and compared between D‐IBS and HC using the quantitative insights into microbial ecology pipeline. Key Results The contribution of bacterial groups to the composition of the intestinal microbiota differed between D‐IBS and HC. D‐IBS patients had significantly higher levels of Enterobacteriaceae (P = 0.03), and lower levels of Fecalibacterium genera (P = 0.04) compared to HC. β‐Diversity values demonstrated significantly lower levels of UniFrac distances in HC compared to D‐IBS patients. The richness of 16S rRNA sequences was significantly decreased in D‐IBS patients (P < 0.04). Conclusions & Inferences Our 16S rRNA sequence data demonstrates a community‐level dysbiosis in D‐IBS. The altered composition of the intestinal microbiota in D‐IBS is associated with significant increases in detrimental and decreases in beneficial bacterial groups, and a reduction in microbial richness.

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Crossref · 10.1111/j.1365-2982.2012.01891.x

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  • The colonic microbiome is altered in patients with IBS compared with healthy controls.

    “others have shown that the colonic microbiome is altered in patients with IBS, when compared with healthy controls. 15 - 18”

    From Efficacy of Probiotics in Irritable Bowel Syndrome: Systematic Review and Meta-analysis (2023) · cites this paper as [16]

    The Discussion reports differences in intestinal microbiota between diarrhea-predominant IBS patients and healthy controls. But this study analyzed fecal samples from that IBS subgroup, so it does not directly establish the claim for the colonic microbiome in IBS patients generally (Discussion; page unavailable). (LLM, conf=0.84)

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  • Emerging data support the existence of dysbiosis in a subset of IBS: a decreased complexity in composition, temporary instability, and changes in the mucosa-associated microbiota, with an increase in Bacteroides and Clostridia and a reduction in Bifidobacterium.

    “Nonetheless, emerging data support the existence of dysbiosis in a subset of IBS [59] : a decreased complexity in composition [60] , temporary instability [61] , and changes in the mucosa-associated microbiota, with an increase in Bacteroides and Clostridia and a reduction in Bifidobacterium [62] .”
  • Recent studies using advanced molecular biology techniques have demonstrated quantitative alterations of specific bacterial groups in patients with IBS compared with healthy controls.

    “Recent studies using these advanced molecular biology techniques have demonstrated quantitative alterations of specific bacterial groups (33, 34, 81, 85, 142, 154) and reduced diversity in gut microbial populations in patients with IBS compared with healthy controls (33, 40).”

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Authors
Carroll, I. M., Ringel‐Kulka, T., Siddle, J. P., & Ringel, Y.
Affiliations
University of North Carolina at Chapel Hill (US)
Corresponding author
Ringel, Y.
Venue
Neurogastroenterology & Motility
Publisher
Wiley
Published
2012-02-20
Volume
24
Issue
6
Pages
521
ISSN
  • 1350-1925 (ISSN-L)
  • 1365-2982
OpenAlex
W1487811474
Cited by
425
References
63
Citations by year
2026: 12 · 2025: 18 · 2024: 28 · 2023: 30 · 2022: 39 · 2021: 40 · 2020: 33 · 2019: 35 · 2018: 30 · 2017: 32 · 2016: 31 · 2015: 27 · 2014: 37 · 2013: 25 · 2012: 7
FWCI
12.33
Type
journal article
Language
en
Open access
Locations
  • Neurogastroenterology & Motility (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • National Institute of Diabetes and Digestive and Kidney Diseases (R03DK084294, DK075621, K23DK075621, K01DK092330, DK084294)
  • National Center for Research Resources (UL1RR025747)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
  • Health Sciences › Medicine › Gastroenterology › Gastrointestinal motility and disorders
  • Health Sciences › Medicine › Epidemiology › Microscopic Colitis
Keywords
diarrhea-predominant irritable bowel syndrome, gut microbiota, dysbiosis, microbial diversity, microbial richness, Enterobacteriaceae, 16S rRNA gene sequencing
MeSH terms
Adult, Aged, Diarrhea, DNA, Bacterial, Feces, Female, Humans, Intestines, Male, Middle Aged, Irritable Bowel Syndrome, Metagenome

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