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Ethanolamine is a valuable nutrient source that impacts Clostridium difficile pathogenesis.

Kathryn L Nawrocki1, Daniela Wetzel1, Joshua B Jones1

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Clostridium difficile utilizes ethanolamine (EA) as a nutrient source, contrary to other pathogens. Disrupting EA metabolism in C. difficile increased virulence and disease severity in a hamster model.

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Area of Science:

  • Microbiology
  • Gastroenterology
  • Pathogen Metabolism

Background:

  • Clostridium difficile is a significant gastrointestinal pathogen causing diarrheal disease.
  • Limited understanding exists regarding host factors and metabolites crucial for C. difficile intestinal growth.
  • Ethanolamine (EA) is a known nutrient and virulence factor signaling molecule for other enteric pathogens.

Purpose of the Study:

  • To investigate the role of ethanolamine (EA) in C. difficile growth.
  • To determine the function of the predicted ethanolamine utilization (eut) gene cluster (CD1907-CD1925) in C. difficile.
  • To assess the impact of EA metabolism on C. difficile virulence in a host model.

Main Methods:

  • Targeted mutagenesis was employed to disrupt genes within the C. difficile eut cluster.
  • Ethanolamine utilization was assessed in vitro.
  • The effect of eut gene disruption on disease outcome was evaluated using a hamster infection model.

Main Results:

  • The eut gene cluster is essential for C. difficile growth using ethanolamine as a primary nutrient.
  • Disruption of the eut cluster impaired C. difficile's ability to utilize ethanolamine.
  • Inability to metabolize ethanolamine led to increased virulence and accelerated disease onset in hamsters.

Conclusions:

  • Ethanolamine serves as a critical nutrient source for C. difficile within the host.
  • Unlike other pathogens, C. difficile metabolism of ethanolamine appears to delay disease onset.
  • Targeting ethanolamine metabolism could be a potential strategy for C. difficile infection control.