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• W4387221415 abstract "ABSTRACT Candida auris is an emerging yeast pathogen of major concern because of its ability to cause hospital outbreaks of invasive candidiasis and to develop resistance to antifungal drugs. A majority of C. auris isolates are resistant to fluconazole, a first-line treatment of invasive candidiasis. Mechanisms of azole resistance are multiple, including mutations in the target gene ERG11 and activation of the transcription factors Tac1b and Mrr1, which control the drug transporters Cdr1 and Mdr1, respectively. In this study, we investigated the role the transcription factor Upc2, which is known to regulate the ergosterol biosynthesis pathway and azole resistance in other Candida spp. Genetic deletion and hyperactivation of Upc2 by epitope tagging in C. auris resulted in drastic increased and decreased susceptibility to azoles, respectively. This effect was conserved in strains with genetic hyperactivation of Tac1b or Mrr1. Reverse transcription PCR analyses showed that Upc2 regulates ERG11 expression and also activates the Mrr1/Mdr1 pathway. We showed that upregulation of MDR1 by Upc2 could occur independently from Mrr1. The impact of UPC2 deletion on MDR1 expression and azole susceptibility in a hyperactive Mrr1 background was stronger than that of MRR1 deletion in a hyperactive Upc2 background. While Upc2 hyperactivation resulted in a significant increase of expression of TAC1b , CDR1 expression remained unchanged. Taken together, our results showed that Upc2 is crucial for azole resistance in C. auris , via regulation of the ergosterol biosynthesis pathway and activation of the Mrr1/Mdr1 pathway. Notably, Upc2 is a very potent and direct activator of Mdr1." @default.
• W4387221415 created "2023-10-01" @default.
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• W4387221415 date "2023-09-29" @default.
• W4387221415 modified "2023-10-18" @default.
• W4387221415 title "Upc2-mediated mechanisms of azole resistance in Candida auris" @default.
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• W4387221415 doi "https://doi.org/10.1101/2023.09.29.560137" @default.
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