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Infection and Immunity, August 2003, p. 4674-4683, Vol. 71, No. 8
0019-9567/03/$08.00+0     DOI: 10.1128/IAI.71.8.4674-4683.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Comparative Genomic Indexing Reveals the Phylogenomics of Escherichia coli Pathogens

Muna F. Anjum,1* Sacha Lucchini,2 Arthur Thompson,2 Jay C. D. Hinton,2 and Martin J. Woodward1

Department of Bacterial Diseases, Veterinary Laboratories Agency-Weybridge, New Haw, Addlestone, Surrey KT15 3NB,1 Molecular Microbiology Group, Institute of Food Research, Norwich Research Park, Norwich NR4 7UA, United Kingdom2

Received 27 January 2003/ Returned for modification 29 March 2003/ Accepted 15 May 2003

The Escherichia coli O26 serogroup includes important food-borne pathogens associated with human and animal diarrheal disease. Current typing methods have revealed great genetic heterogeneity within the O26 group; the data are often inconsistent and focus only on verotoxin (VT)-positive O26 isolates. To improve current understanding of diversity within this serogroup, the genomic relatedness of VT-positive and -negative O26 strains was assessed by comparative genomic indexing. Our results clearly demonstrate that irrespective of virulence characteristics and pathotype designation, the O26 strains show greater genomic similarity to each other than to any other strain included in this study. Our data suggest that enteropathogenic and VT-expressing E. coli O26 strains represent the same clonal lineage and that VT-expressing E. coli O26 strains have gained additional virulence characteristics. Using this approach, we established the core genes which are central to the E. coli species and identified regions of variation from the E. coli K-12 chromosomal backbone.

* Corresponding author. Mailing address: Department of Bacterial Diseases, Veterinary Laboratories Agency-Weybridge, New Haw, Addlestone, Surrey KT15 3NB, United Kingdom. Phone: 44 (0)1932 357830. Fax: 44 (0)1932 357268. E-mail: m.anjum{at}vla.defra.gsi.gov.uk.

Editor: F. C. Fang

Infection and Immunity, August 2003, p. 4674-4683, Vol. 71, No. 8
0019-9567/03/$08.00+0     DOI: 10.1128/IAI.71.8.4674-4683.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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