A microbial signature for Crohn's disease

• Published in: Gut Vol. 66; no. 5; pp. 813 - 822
• Main Authors: Pascal, Victoria, Pozuelo, Marta, Borruel, Natalia, Casellas, Francesc, Campos, David, Santiago, Alba, Martinez, Xavier, Varela, Encarna, Sarrabayrouse, Guillaume, Machiels, Kathleen, Vermeire, Severine, Sokol, Harry, Guarner, Francisco, Manichanh, Chaysavanh
• Format: Journal Article
• Language: English
• Published: England BMJ Publishing Group LTD 01.05.2017; BMJ Publishing Group
• Series: Original article
• Subjects: Adolescent; Adult; Aged; Anorexia; Belgium; Bioinformatics; Biomarkers; Blood; Case-Control Studies; Colitis, Ulcerative - microbiology; Colorectal cancer; Crohn Disease - diagnosis; Crohn Disease - microbiology; Crohn's disease; Dysbiosis - microbiology; E coli; Endoscopy; Epidemiology; Feces - chemistry; Feces - microbiology; Female; Gastrointestinal Microbiome; Germany; Humans; Inflammatory Bowel Disease; Intestinal microflora; Irritable bowel syndrome; Leukocyte L1 Antigen Complex - analysis; Life Sciences; Longitudinal Studies; Male; Medical screening; Microbiomes; Microbiota; Microorganisms; Middle Aged; Prospective Studies; RNA, Bacterial - analysis; RNA, Ribosomal, 16S - analysis; Smoking; Spain; Studies; United Kingdom; Young Adult; United Kingdom > UK; Belgium; Spain; INFLAMMATORY BOWEL DISEASE; INTESTINAL BACTERIA
• ISSN: 0017-5749; 1468-3288; 1468-3288
• DOI: 10.1136/gutjnl-2016-313235

ObjectiveA decade of microbiome studies has linked IBD to an alteration in the gut microbial community of genetically predisposed subjects. However, existing profiles of gut microbiome dysbiosis in adult IBD patients are inconsistent among published studies, and did not allow the identification of microbial signatures for CD and UC. Here, we aimed to compare the faecal microbiome of CD with patients having UC and with non-IBD subjects in a longitudinal study.DesignWe analysed a cohort of 2045 non-IBD and IBD faecal samples from four countries (Spain, Belgium, the UK and Germany), applied a 16S rRNA sequencing approach and analysed a total dataset of 115 million sequences.ResultsIn the Spanish cohort, dysbiosis was found significantly greater in patients with CD than with UC, as shown by a more reduced diversity, a less stable microbial community and eight microbial groups were proposed as a specific microbial signature for CD. Tested against the whole cohort, the signature achieved an overall sensitivity of 80% and a specificity of 94%, 94%, 89% and 91% for the detection of CD versus healthy controls, patients with anorexia, IBS and UC, respectively.ConclusionsAlthough UC and CD share many epidemiologic, immunologic, therapeutic and clinical features, our results showed that they are two distinct subtypes of IBD at the microbiome level. For the first time, we are proposing microbiomarkers to discriminate between CD and non-CD independently of geographical regions.