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Related Experiment Videos

Global gene expression in Staphylococcus aureus biofilms.

Karen E Beenken1, Paul M Dunman, Fionnuala McAleese

  • 1Department of Microbiology and Immunology, University of Arkansas for Medical Sciences, 4301 W. Markham, Little Rock, AR 72205, USA.

Journal of Bacteriology
|July 3, 2004
PubMed
Summary

Staphylococcus aureus biofilm formation is impacted by the sarA regulator, but not the ica locus. Biofilm lifestyle involves distinct gene expression, including adaptation to low pH for persistence.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genomics

Background:

  • The staphylococcal accessory regulator (sarA) influences Staphylococcus aureus biofilm formation in vitro.
  • Previous studies indicated sarA's role in biofilm development, but its in vivo significance and the role of the ica locus required further investigation.

Purpose of the Study:

  • To investigate the in vivo role of sarA and the ica locus in Staphylococcus aureus biofilm formation using a murine catheter model.
  • To identify genes and transcriptional changes associated with Staphylococcus aureus persistence within biofilms.

Main Methods:

  • A murine model of catheter-based biofilm formation was used to assess sarA and ica mutants.
  • Transcriptional profiling of Staphylococcus aureus harvested from biofilms was performed using a custom Affymetrix GeneChip, comparing it to planktonic cultures.

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Main Results:

  • The sarA mutant showed reduced biofilm formation in vivo, confirming its importance.
  • The ica locus mutation had minimal impact on biofilm formation both in vitro and in vivo.
  • Transcriptional analysis revealed 48 induced and 84 repressed genes in biofilms compared to planktonic cultures.
  • Gene expression changes suggest an adaptive response to low pH for biofilm persistence.

Conclusions:

  • The sarA gene is crucial for Staphylococcus aureus biofilm formation in vivo.
  • Biofilm lifestyle in Staphylococcus aureus involves significant transcriptional reprogramming, distinct from planktonic growth.
  • Adaptation to low pH is a key factor for Staphylococcus aureus survival within biofilms.