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Research Article

Role of penicillinase plasmids in the stability of the mecA gene in methicillin-resistant Staphylococcus aureus.

K Hiramatsu, E Suzuki, H Takayama, Y Katayama, T Yokota
K Hiramatsu
Department of Microbiology, Faculty of Medicine, Juntendo University, Tokyo, Japan.
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E Suzuki
Department of Microbiology, Faculty of Medicine, Juntendo University, Tokyo, Japan.
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H Takayama
Department of Microbiology, Faculty of Medicine, Juntendo University, Tokyo, Japan.
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Y Katayama
Department of Microbiology, Faculty of Medicine, Juntendo University, Tokyo, Japan.
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T Yokota
Department of Microbiology, Faculty of Medicine, Juntendo University, Tokyo, Japan.
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DOI: 10.1128/AAC.34.4.600
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ABSTRACT

The stability of methicillin resistance (Mcr) in three independent clinical isolates, MR108, MR6, and MR61, of methicillin-resistant Staphylococcus aureus (MRSA) was studied. The Mcr phenotype was stably maintained in the progeny of all three MRSA clones carrying penicillinase plasmids. However, when the clones were tested after elimination of the plasmids, methicillin-susceptible (Mcs) subclones appeared at various frequencies. Seven Mcs subclones were classified into two groups based on their stabilities. Five Mcs subclones, which were derived from homogeneous strains MR108 and MR61, were stably susceptible. They lost penicillin-binding protein 2' production, and moreover, the mecA gene was deleted in four of five subclones. Two subclones were derived from heterogeneous strain MR6. They were very unstable, and more than half of their progeny were Mcr revertants. However, the remainder were stably Mcs and had lost penicillin-binding protein 2' and the mecA gene. We propose that penicillinase plasmids, which are present in most MRSA strains, play an important role in the stability and phenotypic expression of the mecA gene.

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Role of penicillinase plasmids in the stability of the mecA gene in methicillin-resistant Staphylococcus aureus.
K Hiramatsu, E Suzuki, H Takayama, Y Katayama, T Yokota
Antimicrobial Agents and Chemotherapy Apr 1990, 34 (4) 600-604; DOI: 10.1128/AAC.34.4.600

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Role of penicillinase plasmids in the stability of the mecA gene in methicillin-resistant Staphylococcus aureus.
K Hiramatsu, E Suzuki, H Takayama, Y Katayama, T Yokota
Antimicrobial Agents and Chemotherapy Apr 1990, 34 (4) 600-604; DOI: 10.1128/AAC.34.4.600
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