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Article
Plasmid Replicon Typing of Commensal and Pathogenic Escherichia coli Isolates
Applied and Environmental Microbiology
  • Timothy J. Johnson, Iowa State University
  • Yvonne Wannemuehler, Iowa State University
  • Sara J. Johnson, Iowa State University
  • Catherine M. Logue, North Dakota State University
  • David G. White, United States Food and Drug Administration
  • Curt Doetkott, North Dakota State University
  • Lisa K. Nolan, Iowa State University
Document Type
Article
Publication Date
3-1-2007
DOI
10.1128/​AEM.02171-06
Abstract
Despite the critical role of plasmids in horizontal gene transfer, few studies have characterized plasmid relatedness among different bacterial populations. Recently, a multiplex PCR replicon typing protocol was developed for classification of plasmids occurring in members of the Enterobacteriaceae. Here, a simplified version of this replicon typing procedure which requires only three multiplex panels to identify 18 plasmid replicons is described. This method was used to screen 1,015 Escherichia coli isolates of avian, human, and poultry meat origin for plasmid replicon types. Additionally, the isolates were assessed for their content of several colicin-associated genes. Overall, a high degree of plasmid variability was observed, with 221 different profiles occurring among the 1,015 isolates examined. IncFIB plasmids were the most common type identified, regardless of the source type of E. coli. IncFIB plasmids occurred significantly more often in avian pathogenic E. coli (APEC) and retail poultry E. coli (RPEC) than in uropathogenic E. coli (UPEC) and avian and human fecal commensal E. coliisolates (AFEC and HFEC, respectively). APEC and RPEC were also significantly more likely than UPEC, HFEC, and AFEC to possess the colicin-associated genescvaC, cbi, and/or cma in conjunction with one or more plasmid replicons. The results suggest that E. coli isolates contaminating retail poultry are notably similar to APEC with regard to plasmid profiles, with both generally containing multiple plasmid replicon types in conjunction with colicin-related genes. In contrast, UPEC and human and avian commensal E. coli isolates generally lack the plasmid replicons and colicin-related genes seen in APEC and RPEC, suggesting limited dissemination of such plasmids among these bacterial populations.
Comments

This article is from Applied and Environmental Microbiology 73, no. 6 (March 2007): 1976–1983, doi:10.1128/AEM.02171-06.

Copyright Owner
American Society for Microbiology
Language
en
Date Available
May 6, 2013
File Format
application/pdf
Citation Information
Timothy J. Johnson, Yvonne Wannemuehler, Sara J. Johnson, Catherine M. Logue, et al.. "Plasmid Replicon Typing of Commensal and Pathogenic Escherichia coli Isolates" Applied and Environmental Microbiology Vol. 73 Iss. 6 (2007) p. 1976 - 1983
Available at: http://works.bepress.com/lisa_nolan/23/