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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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A genetic switch controls Pseudomonas aeruginosa surface colonization.

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Pseudomonas aeruginosa uses a genetic switch to create specialized cell groups for surface colonization and dispersal. Targeting this HecE pathway can control infections by this opportunistic pathogen.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Infectious Diseases

Background:

  • Efficient colonization of mucosal surfaces is crucial for opportunistic pathogens like Pseudomonas aeruginosa.
  • Mechanisms governing bacterial adaptation for adherence, virulence, and dispersal remain largely unclear.

Purpose of the Study:

  • To identify genetic mechanisms controlling Pseudomonas aeruginosa surface colonization and dispersal.
  • To investigate the role of the hecR-hecE genetic switch in bacterial adaptation.
  • To explore the HecE pathway as a potential therapeutic target.

Main Methods:

  • Identified a stochastic genetic switch, hecR-hecE, exhibiting bimodal expression.
  • Investigated the role of HecE in regulating cyclic diguanylate monophosphate (c-di-GMP) levels.
  • Assessed the impact of HecE expression on bacterial subpopulations and community behavior.
  • Evaluated the HecE pathway as a druggable target.

Main Results:

  • The hecR-hecE switch generates distinct subpopulations: HecE-high cells promote colonization, while HecE-low cells disperse.
  • HecE modulates c-di-GMP levels by inhibiting BifA and stimulating WspR.
  • The proportion of HecE+ cells is influenced by stress factors, balancing biofilm formation and dispersal.
  • The HecE pathway was confirmed as a druggable target for controlling P. aeruginosa surface colonization.

Conclusions:

  • The HecE pathway represents a novel mechanism for balancing growth and dispersal in P. aeruginosa.
  • Targeting this pathway offers a promising strategy to combat mucosal infections caused by this pathogen.
  • Understanding these binary states provides new avenues for controlling P. aeruginosa surface colonization.