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Inferring a population structure for Staphylococcus epidermidis from multilocus sequence typing data.

M Miragaia1, J C Thomas, I Couto

  • 1Laboratório de Genética Molecular, Instituto de Technologia Química e Biológica, Universidade Nova de Lisboa (ITQB/UNL), Portugal.

Journal of Bacteriology
|January 16, 2007
PubMed
Summary
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Staphylococcus epidermidis exhibits high genetic diversity with nine globally disseminated epidemic clones. Recombination and mobile genetic element transfer, including SCCmec, drive rapid evolution in this important human pathogen.

Area of Science:

  • Microbiology
  • Epidemiology
  • Population Genetics

Background:

  • Staphylococcus epidermidis is a significant human pathogen with poorly understood population structure and global epidemiology.
  • Mechanisms driving clonal diversification and their relative importance remain unclear.

Purpose of the Study:

  • To investigate the population structure and global epidemiology of Staphylococcus epidermidis.
  • To characterize mobile genetic elements, specifically SCCmec, associated with methicillin resistance.

Main Methods:

  • Multilocus sequence typing (MLST) was employed to analyze 217 S. epidermidis isolates from diverse origins.
  • The eBURST algorithm was used to analyze MLST data and identify clonal lineages.
  • Mobile element SCCmec, carrying methicillin resistance genes, was characterized.

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Main Results:

  • MLST revealed 74 distinct sequence types, indicating high genetic diversity.
  • Nine epidemic clonal lineages were identified, with one lineage (clonal complex 2) dominating (74% of isolates).
  • SCCmec was acquired at least 56 times, and recombination was found to be twice as frequent as point mutations in driving allele diversification.

Conclusions:

  • Staphylococcus epidermidis possesses an epidemic population structure with globally distributed clonal lineages.
  • Frequent transfer of mobile genetic elements, including SCCmec, contributes to the rapid evolution and diversification of S. epidermidis.