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Avirulence of Candida albicans FAS2 mutants in a mouse model of systemic candidiasis
X J Zhao1, G E McElhaney-Feser, M J Sheridan
1Department of Microbiology and Immunology, Georgetown University, Washington, D.C. 20007, USA.
Abstract:
Disruption of both alleles of the Candida albicans FAS2 gene abolishes the ability of the organism to establish infection in a murine model of systemic candidiasis. Within 72 h all mice inoculated with 10(6) CFU of the parental C. albicans strain had died. In contrast, all animals inoculated with the mutant strain CFD2 survived for the course of the experiment (21 days). Animals infected with either mutant strain CFD1 or CFD3, in which only one FAS2 allele was disrupted, also succumbed to infection, but mortality was not observed until 4 days postinfection and survivors remained for up to 20 days postinfection. The results demonstrate that FAS2 is required for successful C. albicans infection.
Insights
The Candida albicans FAS2 gene is essential for causing systemic candidiasis infections in mice. Disrupting this gene prevents the fungus from establishing a fatal infection, highlighting its role in fungal pathogenesis.
Area of Science:
- Mycology
- Infectious Diseases
- Molecular Biology
Background:
- Candida albicans is an opportunistic fungal pathogen responsible for a range of infections.
- The FAS2 gene, encoding a key enzyme in fatty acid synthesis, has a poorly understood role in C. albicans virulence.
- Understanding virulence factors is crucial for developing targeted antifungal therapies.
Purpose of the Study:
- To investigate the role of the Candida albicans FAS2 gene in the development of systemic candidiasis.
- To determine if FAS2 is essential for fungal survival and pathogenesis in a murine model.
Main Methods:
- Generation of C. albicans mutant strains with disrupted FAS2 alleles (CFD1, CFD2, CFD3).
- Inoculation of a murine model of systemic candidiasis with parental and mutant strains.
- Monitoring of animal survival rates and time to mortality post-infection.
Main Results:
- Mice infected with the parental C. albicans strain showed 100% mortality within 72 hours.
- Mice infected with the CFD2 mutant (both FAS2 alleles disrupted) exhibited no mortality throughout the 21-day experiment.
- Mice infected with CFD1 or CFD3 mutants (single FAS2 allele disruption) experienced delayed mortality, with survivors lasting up to 20 days.
Conclusions:
- The FAS2 gene is indispensable for Candida albicans to establish and maintain infection in a murine model of systemic candidiasis.
- Complete disruption of FAS2 abolishes fungal virulence, suggesting fatty acid synthesis is critical for pathogenesis.
- Targeting FAS2 could represent a novel strategy for treating invasive candidiasis.