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Kim Suyoung,Kim Se Hyeon,Kweon Eunjoong,Kim Jinmi 한국미생물학회 2023 The journal of microbiology Vol.61 No.4
The morphological switch from the yeast to hyphal form is a key virulence attribute of the opportunistic fungal pathogen, Candida albicans. Our recent report showed that deletion of the newly identified apoptotic factor, CaNma111 or CaYbh3, leads to hyperfilamentation and increased virulence in a mouse infection model. CaNma111 and CaYbh3 are homologs of the pro-apoptotic protease, HtrA2/Omi, and BH3-only protein, respectively. In this study, we examined the effects of CaNMA111 and CaYBH3 deletion mutations on the expression levels of the hypha-specific transcription factors, Cph1 (a hyphal activator), Nrg1 (a hyphal repressor), and Tup1 (a hyphal repressor). The protein levels of Nrg1 were decreased in Caybh3/Caybh3 cells while those of Tup1 were decreased in both Canma111/Canma111 and Caybh3/Caybh3 cells. These effects on Nrg1 and Tup1 proteins were retained during serum-induced filamentation and appear to explain the hyperfilamentation phenotypes of the CaNMA111 and CaYBH3 deletion mutants. Treatment with the apoptosis-inducing dose of farnesol decreased the Nrg1 protein levels in the wild-type strain and more evidently in Canma111/Canma111 and Caybh3/Caybh3 mutant strains. Together, our results suggest that CaNma111 and CaYbh3 are key regulators of Nrg1 and Tup1 protein levels in C. albicans.
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