Novel determinants of antibiotic resistance: Identification of mutated Loci in Highly methicillin-resistant subpopulations of methicillin-resistant Staphylococcus aureus

Janina Dordel, Choonkeun Kim, Marilyn Chung, María Pardos de la Gándara, Matthew T J Holden, Julian Parkhill, Herminia Garcez Lencastre, Stephen D. Bentley, Alexander Tomasz

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

We identified mutated genes in highly resistant subpopulations of methicillin-resistant Staphylococcus aureus (MRSA) that are most likely responsible for the historic failure of the β-lactam family of antibiotics as therapeutic agents against these important pathogens. Such subpopulations are produced during growth of most clinical MRSA strains, including the four historically early MRSA isolates studied here. Chromosomal DNA was prepared from the highly resistant cells along with DNA from the majority of cells (poorly resistant cells) followed by full genome sequencing. In the highly resistant cells, mutations were identified in 3 intergenic sequences and 27 genes representing a wide range of functional categories. A common feature of these mutations appears to be their capacity to induce high-level β-lactam resistance and increased amounts of the resistance protein PBP2A in the bacteria. The observations fit a recently described model in which the ultimate controlling factor of the phenotypic expression of β-lactam resistance in MRSA is a RelA-mediated stringent response.

Original languageEnglish
Article numbere01000-13
JournalmBio
Volume5
Issue number2
DOIs
Publication statusPublished - 8 Apr 2014

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