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Characterization of a novel staphylococcal cassette chromosome composite island from community-associated MRSA isolated in aged care facilities in Western Australia

Wilson, L.K., Coombs, G.W., Christiansen, K., Grubb, W.B. and O'Brien, F.G. (2016) Characterization of a novel staphylococcal cassette chromosome composite island from community-associated MRSA isolated in aged care facilities in Western Australia. Journal of Antimicrobial Chemotherapy, 71 (12). pp. 3372-3375.

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Link to Published Version: http://dx.doi.org/10.1093/jac/dkw317
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Abstract

Background: In Western Australia (WA), clonal complex 5, ST835, community-associated (CA) MRSA is isolated almost exclusively from aged care facilities. In WA four different staphylococcal cassette chromosome (SCC) mec (SCCmec) elements have been identified in this ST, indicating high genetic activity in the SCCmec region.

Objectives: To investigate the SCC region of ST835 CA-MRSAWA MRSA-40 and determine the distribution of an SCCsorbitol element found within the region.

Results: The SCC region contained a composite island, SCCmec(WA MRSA-40)-CI, that was composed of three elements, Psi SCCpls, SCCsorbitol and SCCmecV(T) (5C2&5). This is the first time that a sorbitol operon has been reported in an SCC element.

Conclusions: Generation of SCCmecWA MRSA-40-CI has involved multiple genetic events and recombination with CoNS has occurred during evolution of the SCC elements. While Staphylococcus aureus is renowned for its ability to utilize mobile genetic elements to disseminate antimicrobial resistance, the SCC region of WA MRSA-40 shows that this clone has also utilized SCC elements to acquire extra virulence and possibly adapt to a niche environment.

Publication Type: Journal Article
Murdoch Affiliation: School of Veterinary and Life Sciences
Publisher: Oxford University Press on behalf of the British Society for Antimicrobial Chemotherapy
URI: http://researchrepository.murdoch.edu.au/id/eprint/35646
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