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Bacterial phylotype alterations in irritable bowel syndrome

January 15, 2010
World Journal of Gastroenterology
A research team from Finland tested the capability of a set of quantitative real-time polymerase chain reaction assays targeting the 16S rRNA gene on a phylotype level to differentiate between irritable bowel syndrome symptom subtypes and healthy controls. The applied assays form a potentially useful set for future studies.

Irritable bowel syndrome (IBS) is a common gastrointestinal functional disorder that can greatly affect the patient's well being. Multiple interacting mechanisms, including alterations in the intestinal microbiota, are suspected to lie behind IBS aetiology.

A research article to be published on December 21, 2009 in the World Journal of Gastroenterology addresses this question. The research team from Finland quantified fourteen bacterial phylotypes which corresponded with bacterial species of the gastrointestinal (GI) tract from faecal samples of IBS patients and healthy controls. In their study, assays for analyzing phylotype specific bacterial alterations in association to IBS were developed and applied.

They found a phylotype with 85% similarity to C. thermosuccinogenes was quantified in significantly different quantities among the diarrhoea-predominant (IBS-D) and control subjects, IBS-D and mixed symptom-subtype (IBS-M) subjects. A phylotype with 94% similarity to R. torques was more prevalent in IBS-D patients' intestinal microbiota than in that of control subjects. A phylotype with 93% similarity to R. torques was associated with control samples when compared with IBS-M. Additionally, a R. bromii-like phylotype was associated with constipation-predominant (IBS-C) patients in comparison to control subjects.

The researchers drew a conclusion that the detected altering phylotypes might be useful as targets in diagnostic, therapeutic and host-microbe interaction studies.

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Journal Reference:

  1. Lyra A, Rinttilä T, Nikkilä J, Krogius-Kurikka L, Kajander K, Malinen E, Mättö J, Mäkelä L, Palva A. Diarrhoea-predominant irritable bowel syndrome distinguishable by 16S rRNA gene phylotype quantification. World Journal of Gastroenterology, 2009; 15 (47): 5936 DOI: 10.3748/wjg.15.5936

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World Journal of Gastroenterology. "Bacterial phylotype alterations in irritable bowel syndrome." ScienceDaily. ScienceDaily, 15 January 2010. <>.
World Journal of Gastroenterology. (2010, January 15). Bacterial phylotype alterations in irritable bowel syndrome. ScienceDaily. Retrieved May 23, 2017 from
World Journal of Gastroenterology. "Bacterial phylotype alterations in irritable bowel syndrome." ScienceDaily. (accessed May 23, 2017).