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Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations
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Multilevel selection analysis of a microbial social trait.

Laura de Vargas Roditi1, Kerry E Boyle, Joao B Xavier

  • 1Program in Computational Biology, Memorial Sloan-Kettering Cancer Center, New York, NY, USA.

Molecular Systems Biology
|August 21, 2013
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Summary

Cooperation in microbes evolves when group benefits outweigh costs, but regulated gene expression is a more reliable strategy than constitutive cooperation. This research clarifies conditions favoring microbial social traits.

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Area of Science:

  • Microbial ecology
  • Evolutionary biology
  • Behavioral genetics

Background:

  • Microbial cooperation is often explained by group benefits.
  • Multilevel selection models highlight that group benefits alone do not guarantee cooperation's evolution.
  • Understanding the precise conditions for cooperation is crucial.

Purpose of the Study:

  • To define the specific conditions favoring the evolution of microbial cooperation.
  • To analyze a microbial social trait, swarming in *Pseudomonas aeruginosa*, using multilevel selection theory.
  • To investigate the role of gene expression regulation in the evolution of cooperation.

Main Methods:

  • Utilized the multilevel partition of the Price equation.
  • Employed a laboratory model system (*Pseudomonas aeruginosa* swarming).
  • Parameterized a population dynamics model using competition experiments with manipulated expression levels to alter the cost-to-benefit ratio of swarming.

Main Results:

  • Multilevel selection can favor costly swarming cooperation due to population expansion.
  • Constitutive cooperation is only favored by natural selection at high relatedness due to high costs and diminishing returns.
  • Regulated expression of cooperative genes offers a more robust strategy, providing benefits without excessive costs or diminishing returns.

Conclusions:

  • Regulated expression of cooperative traits is a more effective strategy for microbial cooperation than constitutive expression.
  • Strong group selection does not automatically lead to the emergence of microbial cooperation.
  • The cost-benefit ratio and relatedness are critical factors in the evolution of microbial cooperation.