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Cheater suppression and stochastic clearance through quorum sensing.

Alexander S Moffett1, Peter J Thomas2, Michael Hinczewski3

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Summary

Quorum sensing can harm bacterial populations by regulating public goods. However, it can stabilize cooperation and reduce extinction risk when public good production is costly.

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Mathematical Biology

Background:

  • Bacterial cooperation is crucial for survival and often regulated by quorum sensing.
  • The evolutionary impact of quorum sensing on bacterial population dynamics and cooperation remains unclear.
  • Unregulated public good production can be exploited by non-producing cheaters.

Purpose of the Study:

  • To investigate the evolutionary consequences of quorum sensing in regulating bacterial public good production.
  • To analyze the effects of quorum sensing on bacterial population dynamics, considering cooperation and cheating.
  • To determine how production costs and growth rates influence quorum sensing efficacy.

Main Methods:

  • Development and analysis of a birth-death model for bacterial population dynamics.
  • Inclusion of public good production, non-producing cheaters, and demographic noise in the model.
  • Mathematical modeling to assess population extinction times and cooperation stability.

Main Results:

  • Quorum sensing can be detrimental to bacterial populations compared to unregulated production when public goods are inexpensive.
  • Demographic noise significantly impacts the consequences of quorum sensing.
  • When public good production is costly, quorum sensing promotes cooperation and reduces extinction risk.

Conclusions:

  • Quorum sensing's effect on bacterial cooperation is context-dependent, influenced by production costs and demographic factors.
  • Quorum sensing can be a "collectively harmful" strategy under certain conditions.
  • Under high production costs, quorum sensing emerges as a beneficial strategy for bacterial populations, enhancing stability and survival.