Variation in salmonella enterica serovar typhi IncHI1 plasmids during the global spread of resistant typhoid fever

Phan, Minh-Duy, Kidgell, Claire, Nair, Satheesh, Holt, Kathryn E., Turner, Arthur K., Hinds, Jason, Butcher, Philip, Cooke, Fiona J., Thomson, Nicholas R., Titball, Richard, Bhutta, Zulfiqar A., Hasan, Rumina, Dougan, Gordon and Wain, John 2008. Variation in salmonella enterica serovar typhi IncHI1 plasmids during the global spread of resistant typhoid fever. Antimicrobial Agents and Chemotherapy 53 (2) , pp. 716-727. 10.1128/AAC.00645-08

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Abstract

A global collection of plasmids of the IncHI1 incompatibility group from Salmonella enterica serovar Typhi were analyzed by using a combination of DNA sequencing, DNA sequence analysis, PCR, and microarrays. The IncHI1 resistance plasmids of serovar Typhi display a backbone of conserved gene content and arrangement, within which are embedded preferred acquisition sites for horizontal DNA transfer events. The variable regions appear to be preferred acquisition sites for DNA, most likely through composite transposition, which is presumably driven by the acquisition of resistance genes. Plasmid multilocus sequence typing, a molecular typing method for IncHI1 plasmids, was developed using variation in six conserved loci to trace the spread of these plasmids and to elucidate their evolutionary relationships. The application of this method to a collection of 36 IncHI1 plasmids revealed a chronological clustering of plasmids despite their difference in geographical origins. Our findings suggest that the predominant plasmid types present after 1993 have not evolved directly from the earlier predominant plasmid type but have displaced them. We propose that antibiotic selection acts to maintain resistance genes on the plasmid, but there is also competition between plasmids encoding the same resistance phenotype.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Medicine
Subjects:	Q Science > QR Microbiology
Additional Information:	Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0066-4804/ (accessed 24/02/2014)
Publisher:	American Society for Microbiology
ISSN:	0066-4804
Date of First Compliant Deposit:	30 March 2016
Last Modified:	23 May 2023 15:38
URI:	https://orca.cardiff.ac.uk/id/eprint/27255

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