A Molecular Analysis of Fecal and Mucosal Bacterial Communities in Irritable Bowel Syndrome

Dig Dis Sci. 2009 Aug 20. [Epub ahead of print]

A Molecular Analysis of Fecal and Mucosal Bacterial Communities in Irritable Bowel Syndrome.

Codling C, O'Mahony L, Shanahan F, Quigley EM, Marchesi JR. Alimentary Pharmabiotic Centre, Department of Medicine, Cork University Hospital, Cork, Ireland.

PURPOSE: The objectives of this study were, firstly, to determine the diversity of the host's gut microbiota in irritable bowel syndrome (IBS) using a culture-independent method (DGGE of the 16S rRNA gene) and, secondly, to examine mucosal biopsies of IBS patients and compare them to their own fecal microbiota.

METHODS: The diversity of the dominant microbiota in the fecal material of IBS patients was compared to a healthy control group. In addition, we compared the mucosal and fecal microbiota of IBS patients.

RESULTS: Statistical analysis of the mean similarity data for these groups indicated a significant difference (P < 0.001) between IBS (n = 47) and healthy controls (n = 33) with significantly more variation in the gut microbiota of healthy volunteers than that of IBS patients. The average intra-individual similarity between the mucosa and luminal microbiota was 84%, which indicates that different communities were present at the two sites. This difference, however, is similar to that previously described between these two niches in control subjects. The average inter-individual similarity of the bacterial communities on the mucosa and in the lumen of IBS was not significantly different (P > 0.05).

CONCLUSIONS: IBS impacts equally on both bacterial communities in the IBS host and a significant difference in the gut microbiota exists between fecal samples from IBS patients and healthy controls. The reason for this difference is unclear and various possible explanations are available, but much more work is required to determine the underlying reason for this observation.

PMID: 19693670 [PubMed - as supplied by publisher]

{mosgoogle}

{mos_sb_discuss:11}

Set as favorite

Bookmark

Email this

Comments (1) Add Comment

Subscribe to this comment's feed

Show/hide comments

...
written by Maff, August 24, 2009

This study indicates with a high degree of statistical significance (reliability) that differences exist between the gut microflora of irritable bowel syndrome (IBS) patients and healthy people. This adds to a growing body of evidence suggesting disturbances in the balance of bacteria and other organisms in the intestines of IBS patients may play a role in their illness.

See 'Gut Dysbiosis' section of our main Irritable Bowel syndrome (IBS) page.