Abstract
Sexual reproduction is prevalent in eukaryotic organisms and plays a critical role in the evolution of new traits and in the generation of genetic diversity. Environmental factors often have a direct impact on the occurrence and frequency of sexual reproduction in fungi. The regulatory effects of atmospheric relative humidity (RH) on sexual reproduction and pathogenesis in plant fungal pathogens and in soil fungi have been extensively investigated. However, the knowledge of how RH regulates the lifecycles of human fungal pathogens is limited. In this study, we report that low atmospheric RH promotes the development of mating projections and same-sex (homothallic) mating in the human fungal pathogen Candida albicans. Low RH causes water loss in C. albicans cells, which results in osmotic stress and the generation of intracellular reactive oxygen species (ROS) and trehalose. The water transporting aquaporin Aqy1, and the G-protein coupled receptor Gpr1 function as cell surface sensors of changes in atmospheric humidity. Perturbation of the trehalose metabolic pathway by inactivating trehalose synthase or trehalase promotes same-sex mating in C. albicans by increasing osmotic or ROS stresses, respectively. Intracellular trehalose and ROS signal the Hog1-osmotic and Hsf1-Hsp90 signaling pathways to regulate the mating response. We, therefore, propose that the cell surface sensors Aqy1 and Gpr1, intracellular trehalose and ROS, and the Hog1-osmotic and Hsf1-Hsp90 signaling pathways function coordinately to regulate sexual mating in response to low atmospheric RH conditions in C. albicans.
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Acknowledgements
This work was supported by the National Key Research and Development Program of China (2021YFC2300400), the National Natural Science Foundation of China (31930005 and 32170194), and Shanghai Municipal Science and Technology Major Project (HS2021SHZX001). This work was also supported by the National Institutes of Health (NIH) National Institute of General Medical Sciences (NIGMS) award R35GM124594, and by the Kamangar family in the form of an endowed chair to C.J.N. The content is the sole responsibility of the authors and does not represent the views of the funders. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results. We thank all members of the Huang and Nobile labs for feedback on the manuscript.
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Compliance and ethics Clarissa J. Nobile is a cofounder of BioSynesis, Inc., a company developing diagnostics and therapeutics for biofilm infections. The other authors declare that they have no conflict of interest.
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Li, C., Tao, L., Guan, G. et al. Atmospheric humidity regulates same-sex mating in Candida albicans through the trehalose and osmotic signaling pathways. Sci. China Life Sci. 66, 1915–1929 (2023). https://doi.org/10.1007/s11427-023-2309-1
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DOI: https://doi.org/10.1007/s11427-023-2309-1