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Related Experiment Video

Updated: Jun 14, 2025

Detection of Toxin Translocation into the Host Cytosol by Surface Plasmon Resonance
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Clostridioides difficile's virulence requires efficient holin-mediated toxin secretion.

Nicholas V DiBenedetto1,2, Marine Oberkampf3, Aline Crouzols3

  • 1Massachusetts Host-Microbiome Center, Department Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.

Iscience
|June 11, 2025
PubMed
Summary
This summary is machine-generated.

The holin-like protein TcdE is crucial for releasing toxins from Clostridioides difficile. Removing TcdE protects mice from lethal infection by preventing toxin secretion.

Keywords:
BacteriologyBiological sciencesMicrobiologyNatural sciences

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Area of Science:

  • Microbiology
  • Pathogen Biology
  • Molecular Mechanisms

Background:

  • Clostridioides difficile causes pseudomembranous colitis via TcdA and TcdB toxins.
  • These toxins lack standard secretion signals, implying alternative release pathways.
  • Potential mechanisms include TcdE-mediated secretion or passive release from cell lysis.

Purpose of the Study:

  • To investigate the role of the holin-like protein TcdE in Clostridioides difficile toxin secretion.
  • To determine the contribution of TcdE to virulence and host disease in vivo.
  • To elucidate the mechanism of toxin release in high-toxin producing strains.

Main Methods:

  • Genetic deletion of the tcdE gene in high toxin-producing C. difficile strains (UK1 and VPI10463).
  • Assessment of toxin secretion levels independently of cell lysis.
  • Infection models using susceptible gnotobiotic mice to evaluate virulence and survival.

Main Results:

  • Deletion of tcdE significantly reduced toxin secretion in both tested strains.
  • Toxin levels were undetectable in mice infected with ΔtcdE mutants.
  • Mice infected with ΔtcdE mutants showed long-term survival despite active toxin gene expression.

Conclusions:

  • The TcdE holin plays a dominant role in Clostridioides difficile toxin secretion in vivo.
  • TcdE-mediated secretion is a conserved, non-lytic mechanism in toxigenic Clostridia.
  • Targeting TcdE represents a potential therapeutic strategy against C. difficile infection.