Interactions with microbial pathogens

Area of Science:

• Microbiology
• Infectious Disease Research
• Model Organism Biology

Background:

• The nematode Caenorhabditis elegans is a versatile model organism for studying host-pathogen interactions.
• A diverse range of bacterial and fungal pathogens, including human pathogens, can infect and cause disease in C. elegans.
• Studying these infections in C. elegans offers insights into infectious disease mechanisms relevant to human health.

Purpose of the Study:

• To highlight the utility of C. elegans as a model host for infectious disease research.
• To catalog the types of pathogens studied using C. elegans.
• To demonstrate how C. elegans screens identify pathogen virulence factors and host resistance mechanisms.

Main Methods:

• Utilizing C. elegans as a host for various bacterial and fungal pathogens.
• Quantifying pathology, primarily through measuring nematode lifespan.
• Performing genetic screens to identify mutant pathogens with reduced virulence or C. elegans mutants resistant to toxins.

Main Results:

• C. elegans is susceptible to a broad spectrum of human pathogens (e.g., Salmonella, Pseudomonas, Staphylococcus, Cryptococcus neoformans).
• Pathogen colonization often occurs in the C. elegans intestine, leading to decreased lifespan.
• Screens have identified novel pathogen virulence factors and host resistance pathways, some with implications for mammalian infections.

Conclusions:

• C. elegans provides a powerful and tractable model system for dissecting infectious disease processes.
• Genetic screens in C. elegans are effective for discovering virulence factors and host defense mechanisms.
• Findings from C. elegans studies contribute to understanding mammalian infectious diseases.