RT Journal Article SR Electronic T1 An irritable bowel syndrome subtype defined by species-specific alterations in faecal microbiota JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 997 OP 1006 DO 10.1136/gutjnl-2011-301501 VO 61 IS 7 A1 Ian B Jeffery A1 Paul W O'Toole A1 Lena Öhman A1 Marcus J Claesson A1 Jennifer Deane A1 Eamonn M M Quigley A1 Magnus Simrén YR 2012 UL http://gut.bmj.com/content/61/7/997.abstract AB Background and aims Irritable bowel syndrome (IBS) is a common functional gastrointestinal disorder that may be triggered by enteric pathogens and has also been linked to alterations in the microbiota and the host immune response. The authors performed a detailed analysis of the faecal microbiota in IBS and control subjects and correlated the findings with key clinical and physiological parameters.Design The authors used pyrosequencing to determine faecal microbiota composition in 37 IBS patients (mean age 37 years; 26 female subjects; 15 diarrhoea-predominant IBS, 10 constipation-predominant IBS and 12 alternating-type IBS) and 20 age- and gender-matched controls. Gastrointestinal and psychological symptom severity and quality of life were evaluated with validated questionnaires and colonic transit time and rectal sensitivity were measured.Results Associations detected between microbiota composition and clinical or physiological phenotypes included microbial signatures associated with colonic transit and levels of clinically significant depression in the disease. Clustering by microbiota composition revealed subgroups of IBS patients, one of which (n=15) showed normal-like microbiota composition compared with healthy controls. The other IBS samples (n=22) were defined by large microbiota-wide changes characterised by an increase of Firmicutes-associated taxa and a depletion of Bacteroidetes-related taxa.Conclusions Detailed microbiota analysis of a well-characterised cohort of IBS patients identified several clear associations with clinical data and a distinct subset of IBS patients with alterations in their microbiota that did not correspond to IBS subtypes, as defined by the Rome II criteria.