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Bacterial Mucosa-associated Microbiome in Inflamed and Proximal Noninflamed Ileum of Patients With Crohn's Disease.
Olaisen, Maya; Flatberg, Arnar; Granlund, Atle van Beelen; Røyset, Elin Synnøve; Martinsen, Tom Christian; Sandvik, Arne Kristian; Fossmark, Reidar.
Affiliation
  • Olaisen M; Department of Clinical and Molecular Medicine, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway.
  • Flatberg A; Department of Gastroenterology and Hepatology, St. Olav's Hospital, Trondheim University Hospital, Norway.
  • Granlund AVB; Department of Clinical and Molecular Medicine, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway.
  • Røyset ES; Department of Clinical and Molecular Medicine, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway.
  • Martinsen TC; Centre of Molecular Inflammation Research, Norwegian University of Science and Technology, Trondheim, Norway.
  • Sandvik AK; Department of Clinical and Molecular Medicine, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway.
  • Fossmark R; Department of Pathology, St. Olav's Hospital, Trondheim University Hospital, Norway.
Inflamm Bowel Dis ; 27(1): 12-24, 2021 01 01.
Article in En | MEDLINE | ID: mdl-32448900
BACKGROUND: Microbiota is most likely essential in the pathogenesis of Crohn's disease (CD). Fecal diversion after ileocecal resection (ICR) protects against CD recurrence, whereas infusion of fecal content triggers inflammation. After ICR, the majority of patients experience endoscopic recurrence in the neoterminal ileum, and the ileal microbiome is of particular interest. We have assessed the mucosa-associated microbiome in the inflamed and noninflamed ileum in patients with CD. METHODS: Mucosa-associated microbiome was assessed by 16S rRNA sequencing of biopsies sampled 5 and 15 cm orally of the ileocecal valve or ileocolic anastomosis. RESULTS: Fifty-one CD patients and forty healthy controls (HCs) were included in the study. Twenty CD patients had terminal ileitis, with endoscopic inflammation at 5 cm, normal mucosa at 15 cm, and no history of upper CD involvement. Crohn's disease patients (n = 51) had lower alpha diversity and separated clearly from HC on beta diversity plots. Twenty-three bacterial taxa were differentially represented in CD patients vs HC; among these, Tyzzerella 4 was profoundly overrepresented in CD. The microbiome in the inflamed and proximal noninflamed ileal mucosa did not differ according to alpha diversity or beta diversity. Additionally, no bacterial taxa were differentially represented. CONCLUSIONS: The microbiome is similar in the inflamed and proximal noninflamed ileal mucosa within the same patients. Our results support the concept of CD-specific microbiota alterations and demonstrate that neither ileal sublocation nor endoscopic inflammation influence the mucosa-associated microbiome.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Crohn Disease / Gastrointestinal Microbiome / Ileitis / Ileum / Intestinal Mucosa Type of study: Observational_studies / Risk_factors_studies Limits: Adolescent / Adult / Female / Humans / Male Language: En Journal: Inflamm Bowel Dis Journal subject: GASTROENTEROLOGIA Year: 2021 Document type: Article Affiliation country: Norway Country of publication: United kingdom

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Crohn Disease / Gastrointestinal Microbiome / Ileitis / Ileum / Intestinal Mucosa Type of study: Observational_studies / Risk_factors_studies Limits: Adolescent / Adult / Female / Humans / Male Language: En Journal: Inflamm Bowel Dis Journal subject: GASTROENTEROLOGIA Year: 2021 Document type: Article Affiliation country: Norway Country of publication: United kingdom