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 occu...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.展开更多
The trehalose and intracellular glycerol contents of osmotolerant yeast \%Candida krusei\% cells rapidly increased in response to the medium containing NaCl.Addition of NaCl at early exponential phase or steady phase ...The trehalose and intracellular glycerol contents of osmotolerant yeast \%Candida krusei\% cells rapidly increased in response to the medium containing NaCl.Addition of NaCl at early exponential phase or steady phase increased trehalose content only,but the content of extracellular glycerol increased gradually.Development of resistance was accompanied by accumulation of trehalose and was apparently unrelated to intracellular glycerol content which was always low under these conditions.There seems to be an overlap function between trehalose and glycerol in \%Candida krusei\% cells in response to the osmotic conditions.展开更多
基金supported by the National Key Research and Development Program of China(2021YFC2300400)the National Natural Science Foundation of China(31930005 and 32170194)+2 种基金Shanghai Municipal Science and Technology Major Project(HS2021SHZX001)supported by the National Institutes of Health(NIH)National Institute of General Medical Sciences(NIGMS)award R35GM124594by the Kamangar family in the form of an endowed chair to C.J.N.
文摘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.
文摘The trehalose and intracellular glycerol contents of osmotolerant yeast \%Candida krusei\% cells rapidly increased in response to the medium containing NaCl.Addition of NaCl at early exponential phase or steady phase increased trehalose content only,but the content of extracellular glycerol increased gradually.Development of resistance was accompanied by accumulation of trehalose and was apparently unrelated to intracellular glycerol content which was always low under these conditions.There seems to be an overlap function between trehalose and glycerol in \%Candida krusei\% cells in response to the osmotic conditions.
