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Open Access Highly Accessed Research article

Comparative genomics of Escherichia coli isolated from patients with inflammatory bowel disease

Rebecca Munk Vejborg1, Viktoria Hancock1, Andreas M Petersen2, Karen A Krogfelt3 and Per Klemm1*

Author Affiliations

1 Microbial Genomics and Antibiotic Resistance Group, DTU Food, Technical University of Denmark, DK-2800 Lyngby, Denmark

2 Department of Gastroenterology, Hvidovre University Hospital, DK-2650 Hvidovre, Denmark

3 Department of Bacteriology, Mycology and Parasitology, Statens Serum Institut, DK-2300 Copenhagen S, Denmark

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BMC Genomics 2011, 12:316  doi:10.1186/1471-2164-12-316

Published: 15 June 2011

Abstract

Background

Inflammatory bowel disease (IBD) is used to describe a state of idiopathic, chronic inflammation of the gastrointestinal tract. The two main phenotypes of IBD are Crohn's disease (CD) and ulcerative colitis (UC). The major cause of IBD-associated mortality is colorectal cancer. Although both host-genetic and exogenous factors have been found to be involved, the aetiology of IBD is still not well understood. In this study we characterized thirteen Escherichia coli strains from patients with IBD by comparative genomic hybridization employing a microarray based on 31 sequenced E. coli genomes from a wide range of commensal and pathogenic isolates.

Results

The IBD isolates, obtained from patients with UC and CD, displayed remarkably heterogeneous genomic profiles with little or no evidence of group-specific determinants. No IBD-specific genes were evident when compared with the prototypic CD isolate, LF82, suggesting that the IBD-inducing effect of the strains is multifactorial. Several of the IBD isolates carried a number of extraintestinal pathogenic E. coli (ExPEC)-related virulence determinants such as the pap, sfa, cdt and hly genes. The isolates were also found to carry genes of ExPEC-associated genomic islands.

Conclusions

Combined, these data suggest that E. coli isolates obtained from UC and CD patients represents a heterogeneous population of strains, with genomic profiles that are indistinguishable to those of ExPEC isolates. Our findings indicate that IBD-induction from E. coli strains is multifactorial and that a range of gene products may be involved in triggering the disease.

Keywords:
Inflammatory bowel disease; Escherichia coli; Urinary tract infections; LF82