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A Combinatorial Kin Discrimination System in Bacillus subtilis.

Nicholas A Lyons1, Barbara Kraigher2, Polonca Stefanic2

  • 1Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, USA.

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Bacillus subtilis uses diverse molecular mechanisms for kin discrimination, enabling cooperation in multicellular bacterial swarms. This genetic variation drives species diversification and stabilizes cooperative behaviors.

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Genetics

Background:

  • Multicellularity relies on cooperation, which is vulnerable to exploitation.
  • Kin discrimination is a known mechanism to protect cooperation in Bacillus subtilis swarms.
  • The molecular basis for Bacillus subtilis kin discrimination remained largely unknown.

Purpose of the Study:

  • To identify the molecular mechanisms and genetic factors underlying kin recognition in Bacillus subtilis.
  • To investigate the genetic diversity and evolutionary basis of kin discrimination in this bacterium.

Main Methods:

  • Genetic analyses
  • Transcriptomic analyses
  • Bioinformatic analyses
  • Genome-wide analyses

Main Results:

  • Identified numerous genes involved in cell-surface modification and antimicrobial production/response.
  • Observed significant interstrain variation in gene expression and mutation phenotypes related to kin discrimination.
  • Discovered substantial diversity in antimicrobial genes, often acquired through horizontal gene transfer.
  • Demonstrated a dynamic interplay of kin discrimination genes creating a strict relatedness threshold for cooperation.

Conclusions:

  • Kin discrimination in Bacillus subtilis is mediated by a diverse set of genes with interstrain variation.
  • Antimicrobial genes, likely acquired via horizontal gene transfer, play a key role in kin recognition.
  • The combinatorial effect of these genes stabilizes multicellular cooperation and promotes species diversification.