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Mechanically-driven phase separation in a growing bacterial colony.

Pushpita Ghosh1, Jagannath Mondal2, Eshel Ben-Jacob3

  • 1Center for Theoretical Biological Physics, Rice University, Houston, TX 77005;

Proceedings of the National Academy of Sciences of the United States of America
|April 15, 2015
PubMed
Summary
This summary is machine-generated.

Bacterial growth and biofilm formation are influenced by mechanical forces and self-produced extracellular polymeric substances (EPSs). These interactions drive self-organization, aggregation, and pattern formation in growing bacterial colonies.

Keywords:
biofilmsdepletion interactionextracellular polymeric substancemechanical interactionphase separation

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Area of Science:

  • Microbiology
  • Biophysics
  • Computational Biology

Background:

  • Bacterial biofilms are complex structures crucial for microbial communities.
  • Extracellular polymeric substances (EPSs) play a key role in biofilm architecture.
  • Mechanical interactions within dense bacterial systems influence morphology.

Purpose of the Study:

  • To investigate the role of mechanical interactions and EPSs in bacterial self-organization.
  • To model the growth and pattern formation of bacterial colonies on a substrate.
  • To understand how EPSs affect colony morphology and nutrient dynamics.

Main Methods:

  • Particle-based modeling approach.
  • Simulation of nonmotile rod-shaped bacterial cells.
  • Modeling of cell growth, division, nutrient consumption, and EPS production.
  • Inclusion of mechanical repulsive forces and depletion attraction.

Main Results:

  • Mechanical interactions are shown to control collective bacterial behavior.
  • Non-adsorbing EPSs induce bacterial aggregation via depletion attraction.
  • EPSs lead to phase-separated patterns in growing colonies.
  • EPSs suppress branching formation compared to simulations without EPS.

Conclusions:

  • Mechanical forces and EPSs are critical for bacterial self-organization and pattern formation.
  • EPSs significantly alter colony morphology and growth dynamics.
  • The interplay between mechanics, nutrient diffusion, and EPS concentration governs colony development.