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Gene Regulation in Microbial Communities: Quorum Sensing01:28

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Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
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Staphylococcus aureus α-Toxin Effect on Acinetobacter baumannii Behavior.

Jennifer S Fernandez1, Marisel R Tuttobene1,2, Sabrina Montaña3

  • 1Center for Applied Biotechnology Studies, Department of Biological Science, California State University Fullerton, Fullerton, CA 92831, USA.

Biology
|April 23, 2022
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Summary

Staphylococcus aureus secretes molecules that alter Acinetobacter baumannii behavior. This interaction impacts bacterial motility, biofilm formation, and antibiotic resistance, crucial for understanding polymicrobial infections.

Keywords:
Acinetobacter baumanniiStaphylococcus aureuscommensalspolymicrobial infections

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Area of Science:

  • Microbiology
  • Infectious Diseases
  • Bacterial Pathogenesis

Background:

  • Polymicrobial infections present significant treatment challenges, contributing to morbidity and mortality.
  • Gram-negative bacteria can exploit Staphylococcus aureus alpha-toxin effects on host defenses for proliferation.
  • Previous studies suggest S. aureus influences co-infecting pathogen behavior.

Purpose of the Study:

  • To investigate the impact of Staphylococcus aureus secreted molecules on Acinetobacter baumannii behavior.
  • To elucidate the mechanisms by which S. aureus influences A. baumannii motility, biofilm formation, and antibiotic resistance.

Main Methods:

  • Phenotypic analysis of A. baumannii motility and biofilm formation upon exposure to S. aureus cell-free conditioned media (CFCM).
  • Hemolytic activity assays.
  • Transcriptomic analysis (RNA-seq) of A. baumannii exposed to S. aureus CFCM.

Main Results:

  • S. aureus CFCM differentially affected A. baumannii motility; motility decreased with USA300 and LS1 CFCM but increased with USA300 Δhla and LS1 ΔagrA CFCM.
  • A. baumannii exhibited increased biofilm formation and tetracycline resistance in the presence of S. aureus USA300 CFCM.
  • Transcriptomic analysis revealed 463 differentially expressed genes in A. baumannii, related to biofilm, virulence, and antibiotic susceptibility.

Conclusions:

  • Acinetobacter baumannii can sense and respond to molecules secreted by Staphylococcus aureus.
  • These findings highlight inter-species communication in polymicrobial environments and its impact on bacterial virulence and resistance.