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Mutations in Bacillus subtilis can lead to rare twin spore formation. Genetic control over this process, termed partial penetrance, offers insights into developmental evolution and the emergence of new traits.

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Area of Science:

  • Microbiology
  • Developmental Biology
  • Evolutionary Biology

Background:

  • Developmental processes typically yield uniform outcomes in isogenic populations.
  • Partial penetrance, where mutations affect individuals differently, is a known phenomenon but poorly understood.
  • The mechanisms governing alternative cell fates and their frequency evolution remain unclear.

Purpose of the Study:

  • To investigate stochastic cell fate determination in Bacillus subtilis sporulation mutants.
  • To understand how genetic networks control partial penetrance and alternative fates.
  • To explore the evolutionary potential of developmental pathways.

Main Methods:

  • Analysis of Bacillus subtilis sporulation mutants with altered intercompartmental signaling.
  • Genetic manipulation of chromosome replication and septation.
  • Time-lapse microscopy to observe sporulation dynamics in B. subtilis and Clostridium oceanicum.

Main Results:

  • Identified a stochastic process controlling multiple alternative cell fates in B. subtilis mutants.
  • Demonstrated genetic control over the penetrance of these mutant fates, including rare twin spore formation.
  • Showed that combined signaling and replication perturbations synergistically increase twin spore penetrance.
  • Observed similar twin sporulation in wild-type Clostridium oceanicum, suggesting conserved mechanisms.

Conclusions:

  • Stochasticity in cell fate determination can facilitate developmental evolution.
  • Partial penetrance allows for the initial expression of novel traits at low frequencies.
  • Genetic parameter adjustments can stabilize and increase the penetrance of new developmental outcomes.
  • This study provides a model for understanding evolutionary transitions between developmental states.