Journal
CANADIAN JOURNAL OF MICROBIOLOGY
Volume 56, Issue 4, Pages 308-316Publisher
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/W10-010
Keywords
Escherichia coli O2; Escherichia coli O28ac; O-antigen; multiplex PCR detection; virulence genes
Ask authors/readers for more resources
The O-antigen gene clusters of Escherichia coli serogroups O2 and O28ac were sequenced, and PCR assays were developed to identify strains belonging to these 2 serogroups. Sixteen and 8 open reading frames were mapped to these loci in E. coli O2:H4 U 9-41 and E. coli O28ac:H25 96-3286, respectively. The wzx (O-antigen flippase) and wzy (O-antigen polymerase) genes in the E. coli O2 and O28ac O-antigen gene clusters were selected as targets for PCR assays for their identification. PCR assays targeting the wzx and wzy genes were specific for these serogroups, with one exception. Escherichia coli serogroup 042 strains gave positive results with wzx and wzy PCR assays targeting E. coli O28ac, and antiserum raised against 042 cross-reacted with serogroup O28ac strains. The O-antigen gene cluster of a strain of E. coli serogroup 042 was sequenced, and there were only 3 nt differences between the O-antigen gene clusters of the O28ac and 042 strains. Multiplex PCR assays targeting the O2 wzx gene, the stx(1), stx(2), hly, eae, and saa genes, and the O28ac wzx, ial, ipaC, and ipaH genes were developed for detecting Shiga toxin-producing E. coli O2 strains and enteroinvasive E. coli O28ac strains, respectively. The O2 and O28ac wzx and wry genes can be used as diagnostic markers in PCR assays for rapid identification of these serogroups as an alternative to serotyping, and the multiplex PCR assays targeting serogroup-specific genes in combination with virulence genes can be used to identify and to detect pathogenic serogroup O2 and O28ac strains.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available