Journal of Bacteriology, April 2001, p. 2586-2594, Vol. 183, No. 8
0021-9193/01/$04.00+0 DOI: 10.1128/JB.183.8.2586-2594.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Department of Medical Microbiology, St. Bartholomew's and the Royal London School of Medicine and Dentistry,1 Department of Infectious and Tropical Diseases, The London School of Hygiene and Tropical Medicine,4 and Department of Biochemistry, Imperial College of Science Technology and Medicine,6 London, The Sanger Centre, Wellcome Trust Genome Campus, Hinxton,2 and Defence Evaluation and Research Agency, Salisbury,3 United Kingdom, and Oxford-Wellcome Clinical Research Unit, Centre for Tropical Diseases, Cho Quan Hospital, Ho Chi Minh City, Vietnam5
Received 6 November 2000/Accepted 29 January 2001
Population genetic studies suggest that Yersinia pestis, the cause of plague, is a clonal pathogen that has recently emerged from Yersinia pseudotuberculosis. Plasmid acquisition is likely to have been a key element in this evolutionary leap from an enteric to a flea-transmitted systemic pathogen. However, the origin of Y. pestis-specific plasmids remains obscure. We demonstrate specific plasmid rearrangements in different Y. pestis strains which distinguish Y. pestis bv. Orientalis strains from other biovars. We also present evidence for plasmid-associated DNA exchange between Y. pestis and the exclusively human pathogen Salmonella enterica serovar Typhi.
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