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Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...
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Characterization of a hypersporulating strain derivative of Clostridioides difficile R20291.

Francisca Cid-Rojas1, Daniel Paredes-Sabja1

  • 1Department of Biology, Texas A&M University, College Station, Texas, USA.

Biorxiv : the Preprint Server for Biology
|December 11, 2025
PubMed
Summary

Researchers discovered a Clostridioides difficile strain with 1000x higher sporulation efficiency. This hypersporulating strain, with genetic mutations, offers a new tool for studying Clostridioides difficile infections (CDI) and developing treatments.

Keywords:
C. difficile sporesR20291exosporiumhypersporulationrsbVspore coatsporulation

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Clostridioides difficile is a Gram-positive, anaerobic pathogen responsible for infections (CDI).
  • C. difficile spores are crucial for disease transmission and recurrence.
  • Studying C. difficile sporulation is challenging due to low and asynchronous yields.

Purpose of the Study:

  • To characterize a novel hypersporulating strain of C. difficile.
  • To investigate the genetic basis for enhanced sporulation efficiency.

Main Methods:

  • Isolation and characterization of a hypersporulating C. difficile strain.
  • Comparative analysis of sporulation efficiency with the parental strain.
  • Whole genome sequencing and genomic analysis.
  • Electron microscopy of spores.

Main Results:

  • A hypersporulating C. difficile strain with 1000-fold increased efficiency was serendipitously isolated.
  • Spores from both parental and hypersporulating strains showed similar ultrastructural features.
  • Genomic analysis revealed a 2356 bp deletion and a missense mutation in rsbV in the hypersporulating strain.
  • The mutation in rsbV may lead to constitutive repression of the SigB-dependent general stress response, derepressing sporulation.

Conclusions:

  • The identified hypersporulating strain provides a valuable tool for C. difficile research.
  • Genetic modifications, particularly in rsbV, are linked to enhanced sporulation.
  • Understanding these mechanisms can inform strategies to control C. difficile infections.