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. 1992 Aug;30(8):2092–2096. doi: 10.1128/jcm.30.8.2092-2096.1992

DNA polymorphisms in methicillin-susceptible and methicillin-resistant strains of Staphylococcus aureus.

M J Carles-Nurit 1, B Christophle 1, S Broche 1, A Gouby 1, N Bouziges 1, M Ramuz 1
PMCID: PMC265449  PMID: 1354223

Abstract

Restriction fragment length polymorphisms in methicillin-susceptible and methicillin-resistant (MRSA) strains of Staphylococcus aureus isolated in the same hospital over a 4-month period were studied by using SmaI and ApaI digestion of genomic DNA and pulsed-field gel electrophoresis. Each of the 20 methicillin-susceptible strains had a unique SmaI pattern, but the 27 MRSA strains showed only seven SmaI patterns. More than half of the SmaI fragments in all of these seven patterns were identical, as were those in the patterns from two unrelated MRSA strains. Digestion with ApaI, which cuts staphylococcus DNA into at least twice as many fragments, confirmed the results obtained with SmaI. Lastly, the plasmid contents of MRSA strains showing identical SmaI and ApaI electrophoretic patterns were not identical. These results are interpreted as supporting the hypothesis that all MRSA strains arose from a single clone and emphasize the need to use several methods in epidemiological investigations of MRSA outbreaks.

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