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Insights on evolution of virulence and resistance from the whole-genome analysis of a predominant methicillin-resistant Staphylococcus aureus clone sequence type 239 in China

  • Article
  • Microbiology
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Chinese Science Bulletin

Abstract

Earlier, we reported that ST239 was the 15-year predominant methicillin-resistant Staphylococcus aureus (MRSA) clone in China. In this study, MRSA strain CN79 belonging to ST239 and isolated from blood was used to determine the whole genome sequence. Comparative genomics analysis was done between MRSA CN79 and 25 sequenced S. aureus in the NCBI GenBank database. A total of 2,734 protein-encoding genes were identified in the MRSA CN79 genome, which carries 11 antibiotic resistance genes and 65 virulence genes. Two prophages phiCN79A and phiNM3-like were found on the MRSA CN79 genome. MRSA CN79 carries 30 specific genes that are absent from the 25 sequenced S. aureus genomes. Most of them were prophage-related genes. Several antibiotic resistance genes, such as β-lactamase and ABC-type multidrug transport system gene, were located on the genomic island νSaβ. The antibiotic resistance genes, such as tet (M), ermA1, and blaZ, were also located on different transposons. The virulence genes sea, map, hlb, and sak are located on phiNM3-like prophage and the exotoxin genes are carried on the genomic island νSaα. These results suggest that ST239 MRSA strains are widespread owing to horizontal acquisition of the mobile genetic elements harbored antibiotic resistance genes and virulence genes in response to environmental selective pressures, such as antibiotics and the human immune system during evolution.

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Acknowledgments

This work was supported, in part, by the Beijing Natural Science Foundation (7102130), the Program for New Century Excellent Talents in University (NCET-10-0205), the National Natural Science Foundation of China (31100106) and Key Projects in the National Science & Technology Pillar Program (2012EP001002). The authors thank International Science Editing for polishing the manuscript.

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Authors and Affiliations

  1. Department of Clinical Laboratory, Peking University People’s Hospital, Beijing, 100044, China

    Hongbin Chen, Qi Wang, Chunjiang Zhao, Henan Li, Wenqiang He, Xiaojuan Wang, Feifei Zhang, Zhanwei Wang & Hui Wang

  2. Key Laboratory of Pathogenic Microbiology & Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China

    Xi Yang & Baoli Zhu

  3. Department of Clinical Laboratory, Peking Union Medical College Hospital, Beijing, 100730, China

    Minjun Chen

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  1. Hongbin Chen
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  2. Xi Yang
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  3. Qi Wang
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  10. Minjun Chen
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  11. Baoli Zhu
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Corresponding authors

Correspondence to Baoli Zhu or Hui Wang.

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Hongbin Chen and Xi Yang contributed equally to this work.

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Chen, H., Yang, X., Wang, Q. et al. Insights on evolution of virulence and resistance from the whole-genome analysis of a predominant methicillin-resistant Staphylococcus aureus clone sequence type 239 in China. Chin. Sci. Bull. 59, 1104–1112 (2014). https://doi.org/10.1007/s11434-014-0149-1

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  • DOI: https://doi.org/10.1007/s11434-014-0149-1

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