Surface morphology differences in Clostridium difficile spores, based on different strains and methods of...

Area of Science:

• Microbiology
• Infectious Diseases

Background:

• Clostridium difficile infections are a major healthcare concern, often spread via contaminated environments.
• Previous work suggested C. difficile spore surface architecture influences adherence.
• Spore surface variations may explain differences in C. difficile environmental persistence.

Purpose of the Study:

• To investigate the diversity of C. difficile spore surface morphology.
• To determine the impact of production and purification methods on spore structure.
• To correlate spore surface morphology with protein composition and hydrophobicity.

Main Methods:

• Scanning electron microscopy (SEM) to visualize spore surface morphotypes.
• Production and purification of spores from clinical isolates and C. difficile mutants.
• Sonication as a purification step.
• Assessment of spore hydrophobicity.

Main Results:

• Identified three distinct spore morphotypes: smooth, bag-like, and "pineapple-like".
• Spore morphotype frequency varied by host strain and production/purification methods.
• Sonication significantly altered spore appearance and properties.
• Mutants lacking CotE or BclA showed no SEM-detectable structural changes but had altered hydrophobicity.

Conclusions:

• C. difficile spore morphology exhibits significant variation among clinical isolates.
• Production and purification methods, especially sonication, profoundly impact spore structure and properties.
• Standardized methodologies are essential for reproducible research and understanding C. difficile spore behavior.