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The 'Amoeboid Predator-Fungal Animal Virulence' Hypothesis
Arturo Casadevall1, Man Shun Fu2, Allan J Guimaraes3
1Department of Molecular Microbiology and Immunology, Johns Hopkins School of Public Health, Baltimore, MD 21205, USA. Acasade1@jhu.edu.
Abstract:
The observation that some aspects of amoeba-fungal interactions resemble animal phagocytic cell-fungal interactions, together with the finding that amoeba passage can enhance the virulence of some pathogenic fungi, has stimulated interest in the amoeba as a model system for the study of fungal virulence. Amoeba provide a relatively easy and cheap model system where multiple variables can be controlled for the study of fungi-protozoal (amoeba) interactions. Consequently, there have been significant efforts to study fungal⁻amoeba interactions in the laboratory, which have already provided new insights into the origin of fungal virulence as well as suggested new avenues for experimentation. In this essay we review the available literature, which highlights the varied nature of amoeba-fungal interactions and suggests some unsolved questions that are potential areas for future investigation. Overall, results from multiple independent groups support the 'amoeboid predator⁻fungal animal virulence hypothesis', which posits that fungal cell predation by amoeba can select for traits that also function during animal infection to promote their survival and thus contribute to virulence.
Insights
Amoeba interactions with fungi can enhance fungal virulence, suggesting amoeba are a valuable model for studying how fungi infect animals. This research explores fungal-protozoal interactions and their implications for virulence.
Area of Science:
- Microbiology
- Pathogenesis Research
- Evolutionary Biology
Background:
- Fungal virulence mechanisms are not fully understood.
- Amoeba-fungal interactions share similarities with host immune cell-fungal interactions.
- Amoeba passage can increase the virulence of pathogenic fungi.
Purpose of the Study:
- To review the literature on amoeba-fungal interactions.
- To explore the utility of amoeba as a model system for studying fungal virulence.
- To investigate the 'amoeboid predator-fungal animal virulence hypothesis'.
Main Methods:
- Literature review of existing studies on amoeba-fungal interactions.
- Analysis of experimental data on fungal virulence after amoeba passage.
- Synthesis of findings to support or refute the proposed virulence hypothesis.
Main Results:
- Amoeba serve as a cost-effective and controllable model for studying fungal virulence.
- Fungal-protozoal interactions offer insights into the evolution of fungal pathogenicity.
- Evidence supports the 'amoeboid predator-fungal animal virulence hypothesis'.
Conclusions:
- Amoeba-fungal interactions provide a valuable model for understanding fungal virulence.
- Predation by amoeba can select for fungal traits that enhance virulence in animal hosts.
- Further research into these interactions can reveal new strategies for combating fungal infections.