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The spore differentiation pathway in the enteric pathogen Clostridium difficile.

Fátima C Pereira1, Laure Saujet, Ana R Tomé

  • 1Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, ITQB-UNL, Estação Agronómica Nacional, Oeiras, Portugal.

Plos Genetics
|October 8, 2013
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Summary

Endospore formation in Clostridium difficile shows key differences from Bacillus subtilis, with less strict sequential activation of sigma factors and signaling pathways. This suggests a more flexible, yet conserved, ancient bacterial development program.

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Area of Science:

  • Bacterial development and differentiation
  • Microbial pathogenesis
  • Molecular biology and gene regulation

Background:

  • Endosporulation is a bacterial survival strategy producing highly resistant spores.
  • In Bacillus subtilis, cell-type-specific sigma factors (σF, σE, σG, σK) regulate sequential gene expression during endosporulation.
  • Endospores are crucial for the infectious cycle of the intestinal pathogen Clostridium difficile.

Purpose of the Study:

  • To investigate the function and regulation of sporulation sigma factors in Clostridium difficile.
  • To compare the endosporulation pathway in C. difficile with the well-established model in Bacillus subtilis.
  • To understand deviations and conserved aspects of this ancient bacterial developmental program.

Main Methods:

  • Morphological characterization of mutants lacking specific sporulation sigma factors.
  • Utilized a fluorescence reporter for single-cell gene expression analysis.
  • Comparative analysis between Clostridium difficile and Bacillus subtilis endosporulation pathways.

Main Results:

  • Identified deviations from the B. subtilis paradigm in C. difficile sigma factor activity.
  • Demonstrated partial independence of σE from σF, σG from σE, and σK from σG.
  • Showed that σK is not strictly required for heat-resistant spore formation, indicating reduced temporal segregation and signaling pathway dependence.

Conclusions:

  • The temporal segregation and cell-cell signaling requirements for sigma factor activation are reduced in Clostridium difficile compared to Bacillus subtilis.
  • Despite differences, the core endosporulation regulatory network, centered on sigma factors, appears conserved evolutionarily.
  • This study highlights the adaptability of this ancient bacterial program in different species.