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. 1994 Oct;32(10):2460–2463. doi: 10.1128/jcm.32.10.2460-2463.1994

Nucleotide sequence analysis of enteropathogenic Escherichia coli (EPEC) adherence factor probe and development of PCR for rapid detection of EPEC harboring virulence plasmids.

J Franke 1, S Franke 1, H Schmidt 1, A Schwarzkopf 1, L H Wieler 1, G Baljer 1, L Beutin 1, H Karch 1
PMCID: PMC264083  PMID: 7814482

Abstract

The 1-kb BamHI-SalI fragment from plasmid pMAR2 termed the enteropathogenic Escherichia coli (EPEC) adherence factor (EAF) probe was cloned in pUC19 and pK18. The nucleotide sequence of this fragment was determined, and a set of primers was designed to amplify a 397-bp region associated with pMAR2 by PCR. An analysis of the whole EAF sequence with database libraries indicated no significant homology to any known genes. However, between bases 701 and 787 of the fragment, an 82.8% homology between the EAF and the insertion sequence IS630 of Shigella sonnei exists. The results of PCR with primers of the EAF sequence demonstrated that all of the 151 EAF probe-positive EPEC strains with localized adherence to HEp-2 cells yielded positive EAF PCR results. In contrast, none of the 277 EAF probe-negative strains reacted to the EAF PCR. In addition, the PCR assay was successfully used to generate vector-free digoxigenin-labeled EAF fragments that gave valid results in colony blot hybridization assays. The EAF PCR appears to be a specific and efficient method for the detection of EPEC strains carrying the EAF plasmids.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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