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• W2590904034 abstract "ABSTRACT Expanding echinocandin use to prevent or treat invasive fungal infections has led to an increase in the number of breakthrough infections due to resistant Candida species. Although it is uncommon, echinocandin resistance is well documented for Candida albicans , which is among the most prevalent bloodstream organisms. A better understanding is needed to assess the cellular factors that promote tolerance and predispose infecting cells to clinical breakthrough. We previously showed that some mutants that were adapted to growth in the presence of toxic sorbose due to loss of one chromosome 5 (Ch5) also became more tolerant to caspofungin. We found here, following direct selection of mutants on caspofungin, that tolerance can be conferred by at least three mechanisms: (i) monosomy of Ch5, (ii) combined monosomy of the left arm and trisomy of the right arm of Ch5, and (iii) an aneuploidy-independent mechanism. Tolerant mutants possessed cell walls with elevated chitin and showed downregulation of genes involved in cell wall biosynthesis, namely, FKS , located outside Ch5, and CHT2 , located on Ch5, irrespective of Ch5 ploidy. Also irrespective of Ch5 ploidy, the CNB1 and MID1 genes on Ch5, which are involved in the calcineurin signaling pathway, were expressed at the diploid level. Thus, multiple mechanisms can affect the relative expression of the aforementioned genes, controlling them in similar ways. Although breakthrough mutations in two specific regions of FKS1 have previously been associated with caspofungin resistance, we found mechanisms of caspofungin tolerance that are independent of FKS1 and thus represent an earlier event in resistance development." @default.
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• W2590904034 date "2017-05-01" @default.
• W2590904034 modified "2023-10-12" @default.
• W2590904034 title "Tolerance to Caspofungin in Candida albicans Is Associated with at Least Three Distinctive Mechanisms That Govern Expression of <i>FKS</i> Genes and Cell Wall Remodeling" @default.
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• W2590904034 doi "https://doi.org/10.1128/aac.00071-17" @default.
• W2590904034 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5404545" @default.
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• W2590904034 hasPublicationYear "2017" @default.
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