Replicative Aging in Pathogenic Fungi

Area of Science:

• Mycology
• Cellular Biology
• Infectious Diseases

Background:

• Pathogenic yeasts including *Candida albicans*, *Candida auris*, *Candida glabrata*, and *Cryptococcus neoformans* cause systemic infections.
• These yeasts undergo replicative aging, a process involving asymmetric cell division, similar to *Saccharomyces cerevisiae*.
• Replicative aging in pathogenic fungi is linked to increased virulence and resistance.

Purpose of the Study:

• To review techniques for studying replicative aging in pathogenic fungi.
• To summarize phenotypic changes associated with yeast aging and virulence.
• To highlight the implications of aging for fungal persistence and antifungal resistance.

Main Methods:

• Adaptation of techniques pioneered in *Saccharomyces cerevisiae* to study aging in pathogenic yeasts.
• Analysis of asymmetric cell division in mother yeast cells.
• Phenotypic characterization of aged yeast cells.

Main Results:

• Aging leads to distinct phenotypic changes in yeast cells with each asymmetric division.
• Older yeast cells exhibit increased resistance to antifungals and phagocytosis.
• These age-related changes contribute to the persistence of pathogenic yeasts.

Conclusions:

• Replicative aging is a significant factor in the virulence of pathogenic fungi.
• Understanding yeast aging mechanisms can inform strategies against fungal infections.
• Phenotypic variations due to aging enhance the survival of pathogenic yeasts in host environments.