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Screening of an E. coli O157:H7 bacterial artificial chromosome library by comparative genomic hybridisation to identify genomic regions contributing to growth in bovine gastrointestinal mucus and epithelial cell colonizationn

By Jianing eBai, Jianing eBai, Sean P McAteer, Edith ePaxton, Arvind eMahajan, David eGally and Jai J Tree


Enterohemorrhagic E. coli (EHEC) O157:H7 can cause serious gastrointestinal and systemic disease in humans following direct or indirect exposure to the bacterium excreted in ruminant feces. The main colonization site of EHEC O157:H7 in cattle is the terminal rectum where the bacteria intimately attach to the epithelium and multiply in the intestinal mucus. This study aimed to identify genomic regions of EHEC O157:H7 that contribute to colonization and multiplication at this site. A bacterial artificial chromosome (BAC) library was generated from a derivative of the sequenced E. coli O157:H7 Sakai strain. The library contains 1152 clones averaging 150 kbp. To verify the library, clones containing a complete locus of enterocyte effacement (LEE) were identified by DNA hybridization. In line with a previous report, these did not confer a type III secretion capacity to the K-12 host strain. However, conjugation of one of the BAC clones into a strain containing a partial LEE deletion restored type III secretion. 384 clones from the library were tested in two different assays; one involved three rounds of adherence assays to bovine primary rectal epithelial cells while the other competed the clones over three rounds of growth in bovine rectal mucus. The input strain DNA was then compared with the selected strains using comparative DNA hybridization (CGH) on an E. coli microarray. The adherence assay enriched for pO157 DNA indicating the importance of this plasmid for colonization of rectal epithelial cells. The mucus assay enriched for multiple regions involved in carbohydrate utilization, including hexuronate uptake, indicating that these regions provide a competitive growth advantage in bovine mucus. This BAC-CGH approach provides a positive selection screen that complements negative selection transposon-based screens. As demonstrated, this may be of particular use for identifying genes with redundant functions such as adhesion and carbon metabolism

Topics: Comparative Genomic Hybridization, Mucus, Bacterial Artifical Chromosome, EHEC, Locus of Enterocyte Effacement, sugar utilization, Microbiology, QR1-502
Publisher: Frontiers Media S.A.
Year: 2011
DOI identifier: 10.3389/fmicb.2011.00168
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