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Title: Patient-Specific Bacteroides Genome Variants in Pouchitis

Journal Article · · mBio (Online)
 [1];  [2];  [1];  [2];  [2];  [3];  [4];  [2];  [5];  [2];  [1]
  1. Marine Biological Lab., Woods Hole, MA (United States)
  2. The Univ. of Chicago, Chicago, IL (United States)
  3. Mayo Clinic, Rochester, MN (United States)
  4. The Univ. of Chicago, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Marine Biological Lab., Woods Hole, MA (United States); The Univ. of Chicago, Chicago, IL (United States)

Here, a 2-year longitudinal microbiome study of 22 patients who underwent colectomy with an ileal pouch anal anastomosis detected significant increases in distinct populations of Bacteroides during 9 of 11 patient visits that coincided with inflammation (pouchitis). Oligotyping and metagenomic short-read annotation identified Bacteroides populations that occurred in early samples, bloomed during inflammation, and reappeared after antibiotic treatment. Targeted cultivation of Bacteroides isolates from the same individual at multiple time points and from several patients detected subtle genomic changes, including the identification of rapidly evolving genomic elements that differentiate isogenic strains of Bacteroides fragilis from the mucosa versus lumen. Each patient harbored Bacteroides spp. that are closely related to commonly occurring clinical isolates, including Bacteroides ovatus, B. thetaiotaomicron, B. vulgatus, and B. fragilis, which contained unique loci in different patients for synthesis of capsular polysaccharides. The presence of unique Bacteroides capsular polysaccharide loci within different hosts and between the lumen and mucosa may represent adaptations to stimulate, suppress, and evade host-specific immune responses at different microsites of the ileal pouch.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
University of Chicago; USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1416005
Journal Information:
mBio (Online), Vol. 7, Issue 6; ISSN 2150-7511
Publisher:
American Society for MicrobiologyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

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