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Biolistic Transformation of a Fluorescent Tagged Gene into the Opportunistic Fungal Pathogen Cryptococcus neoformans
Published on: March 19, 2015
mRNA decay: an adaptation tool for the environmental fungal pathogen Cryptococcus neoformans
Amanda L M Bloom1, Jay Leipheimer1, John C Panepinto1
1Witebsky Center for Microbial Pathogenesis and Immunology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, The State University of New York, Buffalo, NY, USA.
Abstract:
Fungi are ubiquitous in the environment and humans constantly encounter them in the soil, air, water, and food. The vast majority of these interactions are inconsequential. However, in the context of immunodeficiency precipitated by HIV infection, hematologic malignancy, or transplantation, a small subset of fungi can cause devastating, systemic infection. The most deadly of the opportunistic environmental fungi, Cryptococcus neoformans, is estimated to cause hundreds of thousands of deaths per year, mostly in the context of HIV co-infection. The cellular processes that mediate adaptation to the host environment are of great interest as potential novel therapeutic targets. One such cellular process important for host adaptation is mRNA decay, which mediates the specific degradation of subsets of functionally related mRNAs in response to stressors relevant to pathogenesis, including human core body temperature, carbon limitation, and reactive oxygen stress. Thus, for C. neoformans, host adaptation requires mRNA decay to mediate rapid transcriptome remodeling in the face of stressors encountered in the host. Several nodes of stress-responsive signaling that govern the stress-responsive transcriptome also control the decay rate of mRNAs cleared from the ribosome during stress, suggesting an additional layer of coupling between mRNA synthesis and decay that allows C. neoformans to be a successful pathogen of humans. WIREs RNA 2017, 8:e1424. doi: 10.1002/wrna.1424 For further resources related to this article, please visit the WIREs website.
Insights
Cryptococcus neoformans uses mRNA decay to adapt to host environments, remodeling its transcriptome to survive stressors like heat and nutrient limitation. This process is crucial for its success as a human pathogen.
Area of Science:
- Mycology
- Molecular Biology
- Pathogenesis
Background:
- Fungi are common environmental microbes, but some, like Cryptococcus neoformans, cause severe systemic infections in immunocompromised individuals.
- Cryptococcus neoformans is a leading cause of fungal deaths, particularly in HIV co-infected patients.
- Understanding fungal adaptation mechanisms is key to developing new antifungal therapies.
Purpose of the Study:
- To investigate the role of mRNA decay in Cryptococcus neoformans adaptation to host-relevant stressors.
- To identify cellular processes that facilitate fungal survival and pathogenesis.
Main Methods:
- Analysis of mRNA decay pathways in Cryptococcus neoformans.
- Studying the impact of environmental stressors on fungal gene expression and mRNA turnover.
- Investigating the link between stress-responsive signaling and mRNA decay.
Main Results:
- mRNA decay is essential for Cryptococcus neoformans to rapidly remodel its transcriptome in response to host stressors.
- Stressors such as human body temperature, carbon limitation, and oxidative stress trigger specific mRNA decay pathways.
- Coordination between mRNA synthesis and decay pathways enhances fungal pathogenicity.
Conclusions:
- mRNA decay is a critical cellular process for Cryptococcus neoformans' adaptation and survival within the human host.
- Targeting mRNA decay pathways could offer novel therapeutic strategies against invasive fungal infections.
- The coupling of mRNA synthesis and decay provides a regulatory layer enabling fungal pathogenesis.
