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Candida albicans Mds3p, a conserved regulator of pH responses and virulence identified through insertional
Dana A Davis1, Vincent M Bruno, Lucio Loza
1Department of Microbiology and Integrated Program in Cellular, Molecular, and Biophysical Studies, Columbia University, New York, New York 10032, USA.
Abstract:
Candida albicans is a commensal fungus that causes diverse infections after antibiotic use or immune debilitation. Gene discovery has been limited because the organism is an asexual diploid. We have developed a strategy that yields random homozygous insertion mutants. The strategy has permitted identification of several prospective essential genes. Many of these genes are homologous to nonessential Saccharomyces cerevisiae genes, and some have no S. cerevisiae homolog. These findings may expand the range of antifungal drug targets. We have also identified new genes required for pH-dependent filamentation, a trait previously associated with virulence. One newly identified gene, MDS3, is required for expression in alkaline media of two filamentation-associated genes, HWP1 and ECE1, but is not required for expression of other pH-response genes. In S. cerevisiae, the two MDS3 homologs are required for growth in alkaline media, thus arguing that Mds3p function in adaptation to external pH changes is conserved. Epistasis tests show that Mds3p contributes to virulence and alkaline pH responses independently of the well-characterized Rim101p pH-response pathway.
Insights
Researchers developed a new method to identify essential genes in Candida albicans, a fungus causing infections. This discovery offers potential new antifungal drug targets and insights into fungal virulence.
Area of Science:
- Mycology
- Molecular Biology
- Antimicrobial Research
Background:
- Candida albicans is a common fungus causing infections, especially after antibiotic use or in immunocompromised individuals.
- Discovering essential genes in this asexual diploid organism has been challenging, limiting antifungal drug development.
- Understanding gene function is crucial for identifying new therapeutic targets against Candida albicans.
Purpose of the Study:
- To develop a novel strategy for generating homozygous insertion mutants in Candida albicans.
- To identify essential genes and novel genes involved in pH-dependent filamentation.
- To explore potential new antifungal drug targets and understand virulence factors.
Main Methods:
- Developed a strategy for creating random homozygous insertion mutants in Candida albicans.
- Utilized gene homology analysis with Saccharomyces cerevisiae.
- Performed epistasis tests to analyze gene function in virulence and pH response pathways.
Main Results:
- Successfully generated homozygous insertion mutants, identifying several prospective essential genes.
- Discovered new genes, including MDS3, crucial for pH-dependent filamentation and virulence.
- Found that Mds3p function in alkaline adaptation is conserved and acts independently of the Rim101p pathway.
Conclusions:
- The new mutant generation strategy is effective for gene discovery in Candida albicans.
- Identified essential genes and novel virulence factors, expanding potential antifungal drug targets.
- MDS3 plays a significant role in Candida albicans' adaptation to alkaline environments and virulence.
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