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Higher dormant bacteria in Staphylococcus epidermidis biofilms correlate with altered gene expression, particularly in oxidation-reduction and metabolism. This finding impacts understanding biofilm inflammatory potential.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Immunology

Background:

  • The proportion of dormant bacteria in Staphylococcus epidermidis biofilms influences their inflammatory potential.
  • Previous studies indicated reduced murine macrophage activation in biofilms with higher dormant bacterial percentages.

Purpose of the Study:

  • To identify key transcriptomic differences between S. epidermidis biofilms with varying proportions of dormant bacteria.
  • To elucidate the molecular mechanisms underlying the relationship between bacterial dormancy and biofilm inflammatory profiles.

Main Methods:

  • Utilized an in vitro model to modulate dormant bacteria proportions in S. epidermidis biofilms using magnesium.
  • Employed RNA-sequencing to analyze differential gene expression.
  • Conducted detailed analysis of gene interactions and biological processes.

Main Results:

  • Identified significant differential expression in 147 genes.
  • Biological processes related to oxidation-reduction and acetyl-CoA metabolism were prominently affected.
  • Gene set enrichment linked translation processes to dormant bacteria proportions.
  • Upregulated transcription of oxidation-reduction related mRNAs was associated with higher dormancy.

Conclusions:

  • Bacterial dormancy in S. epidermidis biofilms is associated with distinct transcriptomic profiles, particularly involving redox and metabolic pathways.
  • These transcriptomic changes may explain the altered inflammatory potential of biofilms with varying dormancy levels.
  • Magnesium's role in inducing dormancy appears independent of medium pH or magnesium transport genes.