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  • 1.
    Tap, Julien
    et al.
    Danone Nutricia Research, Palaiseau, France / French National Institute for Agricultural Research (INRA) MetaGenoPolis, Jouy en Josas, France.
    Derrien, Muriel
    Danone Nutricia Research, Palaiseau, France.
    Törnblom, Hans
    Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden / Centre for Person-Centered Care, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
    Brazeilles, Rémi
    Danone Nutricia Research, Palaiseau, France.
    Cools-Portier, Stéphanie
    Danone Nutricia Research, Palaiseau, France.
    Doré, Joël
    French National Institute for Agricultural Research (INRA) MetaGenoPolis, Jouy en Josas, France.
    Störsrud, Stine
    Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
    Le Nevé, Boris
    Danone Nutricia Research, Palaiseau, France.
    Öhman, Lena
    University of Skövde, School of Health and Education. Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden / Department of Microbiology and Immunology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
    Simrén, Magnus
    Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden / Centre for Person-Centered Care, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden / Center for Functional GI and Motility Disorders, University of North Carolina, Chapel Hill, North Carolina, USA.
    Identification of an Intestinal Microbiota Signature Associated With Severity of Irritable Bowel Syndrome2017In: Gastroenterology, ISSN 0016-5085, E-ISSN 1528-0012, Vol. 152, no 1, p. 111-123.e8Article in journal (Refereed)
    Abstract [en]

    BACKGROUND & AIMS: We have limited knowledge about the association between the composition of the intestinal microbiota and clinical features of irritable bowel syndrome (IBS). We collected information on the fecal and mucosa-associated microbiota of patients with IBS and evaluated whether these were associated with symptoms.

    METHODS: We collected fecal and mucosal samples from adult patients who met the Rome III criteria for IBS at secondary or tertiary care outpatient clinics in Sweden, as well as from healthy subjects. The exploratory set comprised 149 subjects (110 with IBS and 39 healthy subjects); 232 fecal samples and 59 mucosal biopsy samples were collected and analyzed by 16S ribosomal RNA targeted pyrosequencing. The validation set comprised 46 subjects (29 with IBS and 17 healthy subjects); 46 fecal samples, but no mucosal samples, were collected and analyzed. For each subject, we measured exhaled H2 and CH4, oro-anal transit time, and the severity of psychological and gastrointestinal symptoms. Fecal methanogens were measured by quantitative polymerase chain reaction. Numeric ecology analyses and a machine learning procedure were used to analyze the data.

    RESULTS: Fecal microbiota showed covariation with mucosal adherent microbiota. By using classic approaches, we found no differences in fecal microbiota abundance or composition between patients with vs without IBS. A computational statistical technique-like machine learning procedure allowed us to reduce the 16S ribosomal RNA data complexity into a microbial signature for severe IBS, consisting of 90 bacterial operational taxonomic units. We confirmed the robustness of the intestinal microbial signature for severe IBS in the validation set. The signature was able to discriminate between patients with severe symptoms, patients with mild/moderate symptoms, and healthy subjects. By using this intestinal microbiota signature, we found IBS symptom severity to be associated negatively with microbial richness, exhaled CH4, presence of methanogens, and enterotypes enriched with Clostridiales or Prevotella species. This microbiota signature could not be explained by differences in diet or use of medications.

    CONCLUSIONS: In analyzing fecal and mucosal microbiota from patients with IBS and healthy individuals, we identified an intestinal microbiota profile that is associated with the severity of IBS symptoms.

    TRIAL REGISTRATION NUMBER: NCT01252550.

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