Polymorphic amplified typing sequences provide a novel approach to Escherichia coli O157:H7 strain typing.

Journal of Clinical Microbiology
Indira T KudvaStephen B Calderwood

Abstract

Escherichia coli O157:H7 (O157) strains are commonly typed by pulsed-field gel electrophoresis (PFGE) following digestion of genomic DNA with the restriction enzyme XbaI. We have shown that O157 strains differ from each other by a series of discrete insertions or deletions, some of which contain recognition sites for XbaI, suggesting that these insertions and deletions are responsible for the differences in PFGE patterns. We have devised a new O157 strain typing protocol, polymorphic amplified typing sequences (PATS), based on this information. We designed PCR primer pairs to amplify genomic DNA flanking each of 40 individual XbaI sites in the genomes of two O157 reference strains. These primer pairs were tested with 44 O157 isolates, 2 each from 22 different outbreaks of infection. Thirty-two primer pairs amplified identical fragments from all 44 isolates, while eight primer pairs amplified regions that were polymorphic between isolates. The isolates could be differentiated solely on the basis of which of the eight polymorphic amplicons was detected. PATS correctly identified 21 of 22 outbreak pairs as being identical or highly related, whereas PFGE correctly identified 14 of the 22 outbreak pairs as being identical or highly ...Continue Reading

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Citations

Jan 16, 2003·Trends in Microbiology·Michael L KotewiczThomas A Cebula
Jun 4, 2005·Applied and Environmental Microbiology·Lilach SomerYechezkel Kashi
Jul 31, 2009·Journal of Clinical Microbiology·Tadasuke OokaTetsuya Hayashi
May 29, 2007·Microbiology·Michael L KotewiczThomas A Cebula
Oct 7, 2004·Applied and Environmental Microbiology·Gerry P SchambergerFrancisco Diez-Gonzalez

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