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• W4236688425 abstract "Abstract Fungi can tolerate extremely high doses of ionizing radiation compared with most other eukaryotes, a phenomenon encompassing both the recovery from acute exposure and the growth of melanized fungi in chronically contaminated environments. This observation has led to the use of fungi in radiobiology studies, with the goal of finding novel resistance mechanisms that could assist fields such as nuclear medicine and space biology. As photonic (x-ray and γ-ray) exposure is the most widely available method for irradiation, little work has been done examining how fungi (other than budding yeast) respond to irradiation by ionizing particles (e.g. protons), although particle irradiation may cause distinct cellular damage, and it is more relevant to environmental exposure profiles. Here, we expand on a previous study of the melanized yeast Exophiala dermatitidis responding to γ-radiation exposure by characterizing the phenotypic and transcriptomic response to irradiation by three different ionizing particles: protons, deuterons, and α-particles. No significant difference in survival was observed between these strains under any condition, suggesting that melanin does not impart protection to acute irradiation to these particles. The transcriptomic response during recovery to particle exposure was similar to that observed after γ-irradiation, with DNA repair and replication genes upregulated, and genes involved in translation and ribosomal biogenesis being heavily repressed, indicating an attenuation of cell growth. However, a comparison of global gene expression showed clear clustering into particle and γ-radiation groups. The response elicited by particle irradiation was more complex. Compared to the γ-associated response, particle irradiation resulted in greater changes in gene expression, a more diverse set of differentially expressed genes, and a significant induction of gene categories such as autophagy and protein catabolism. Additionally, individual particle responses were analyzed and compared, resulting in the discovery of unique expression signatures and individual genes for each particle type that could be used as radio-nuclide discrimination markers. The strong response we observed here at the gene expression level inprovides insights into the unique types of damage that particle irradiation causes to fungal cells, allowing for future dissection of radiation source-specific resistance mechanisms." @default.
• W4236688425 created "2022-05-12" @default.
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• W4236688425 date "2020-06-17" @default.
• W4236688425 modified "2023-10-16" @default.
• W4236688425 title "The transcriptomic and phenotypic response of the melanized yeast Exophiala dermatitidis to ionizing particle exposure" @default.
• W4236688425 doi "https://doi.org/10.21203/rs.3.rs-34742/v1" @default.
• W4236688425 hasPublicationYear "2020" @default.
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