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. 1991 Nov;59(11):3869–3875. doi: 10.1128/iai.59.11.3869-3875.1991

Plasmid and chromosomal elements involved in the pathogenesis of attaching and effacing Escherichia coli.

A E Jerse 1, K G Gicquelais 1, J B Kaper 1
PMCID: PMC258970  PMID: 1937746

Abstract

Attaching and effacing (A/E) intestinal lesions are produced by enteropathogenic Escherichia coli (EPEC), enterohemorrhagic E. coli (EHEC), and RDEC-1, a pathogen of weanling rabbits. We recently identified a chromosomal locus (eae[E. coli A/E]) which is required for A/E activity in a wild-type EPEC strain. Sequences homologous to those of an eae gene probe were detected in EPEC, RDEC-1, and EHEC isolates. We report here that the eae gene is chromosomally encoded in all EPEC and EHEC strains tested and in RDEC-1. In addition, the eae probe was found to be 100% sensitive and 98% specific in detecting E. coli of EPEC serogroups that demonstrate A/E activity. Ten percent of E. coli of EPEC serogroups that hybridized with the eae probe and produced A/E activity did not hybridize with the EAF (EPEC adherence factor) probe, a plasmid-associated diagnostic probe which is currently used to identify EPEC. In addition to A/E factors, plasmid-associated adhesins also contribute to the pathogenesis of EPEC and RDEC-1. To further investigate the role of plasmid-associated adherence, a hybrid RDEC-1-EPEC strain containing the adherence plasmid of an EPEC strain in the A/E background of RDEC-1 was constructed. This hybrid strain, unlike the parent RDEC-1 strain, produced A/E lesions on human tissue culture cells, which suggests that the EPEC adherence plasmid provides tissue specificity to the hybrid strain and that the A/E factors of RDEC-1 are not host restricted.

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Selected References

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