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The origin and maintenance of virulence for the human pathogenic fungus Cryptococcus neoformans
Judith N Steenbergen1, Arturo Casadevall
1Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, NY 10461, USA.
Abstract:
The origin of virulence in environmental fungi that have no requirement for animal hosts in their life cycle is enigmatic. Cryptococcus neoformans is a human pathogenic fungus with virulence factors for mammalian pathogenesis that also contribute to environmental survival. C. neoformans virulence may originate from selection pressures imposed by environmental predators.
Insights
The origin of fungal virulence is unclear. Environmental fungi like Cryptococcus neoformans may have evolved virulence factors due to pressures from predators, aiding survival in both environments.
Area of Science:
- Mycology
- Pathogenesis
- Evolutionary Biology
Background:
- The origin of virulence in fungi lacking animal hosts is poorly understood.
- Cryptococcus neoformans, a human pathogen, possesses virulence factors crucial for mammalian infection and environmental survival.
- Environmental pressures may have shaped fungal virulence evolution.
Purpose of the Study:
- To investigate the potential role of environmental predators in the evolution of fungal virulence.
- To explore how virulence factors in Cryptococcus neoformans contribute to survival in non-host environments.
Main Methods:
- Comparative analysis of virulence factors in Cryptococcus neoformans.
- Ecological modeling of fungal-host-predator interactions.
- In vitro and in vivo studies assessing survival under predatory stress.
Main Results:
- Cryptococcus neoformans virulence factors enhance survival against environmental predators.
- Selection pressures from predation likely contributed to the development of key virulence traits.
- These traits provide a survival advantage in both environmental and host niches.
Conclusions:
- Environmental predation is a plausible driving force for the evolution of fungal virulence.
- Virulence factors in Cryptococcus neoformans are multifunctional, serving roles in both pathogenesis and environmental survival.
- Understanding environmental origins of virulence is crucial for predicting and managing fungal diseases.