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• W2156106543 abstract "Using genetically matched azole-susceptible (AS) and azole-resistant (AR) clinical isolates of Candida albicans , we recently demonstrated that CDR1 overexpression in AR isolates is due to its enhanced transcriptional activation and mRNA stability. This study examines the molecular mechanisms underlying enhanced CDR1 mRNA stability in AR isolates. Mapping of the 3′ untranslated region (3′ UTR) of CDR1 revealed that it was rich in adenylate/uridylate (AU) elements, possessed heterogeneous polyadenylation sites, and had putative consensus sequences for RNA-binding proteins. Swapping of heterologous and chimeric lacZ – CDR1 3′ UTR transcriptional reporter fusion constructs did not alter the reporter activity in AS and AR isolates, indicating that cis -acting sequences within the CDR1 3′ UTR itself are not sufficient to confer the observed differential mRNA decay. Interestingly, the poly(A) tail of the CDR1 mRNA of AR isolates was ∼35–50 % hyperadenylated as compared with AS isolates. C. albicans poly(A) polymerase ( PAP1 ), responsible for mRNA adenylation, resides on chromosome 5 in close proximity to the mating type-like ( MTL ) locus. Two different PAP1 alleles, PAP1-a/PAP1-α , were recovered from AS ( MTL-a/MTL-α ), while a single type of PAP1 allele ( PAP1-α ) was recovered from AR isolates ( MTL-α/MTL-α ). Among the heterozygous deletions of PAP1-a (Δ pap1-a/PAP1-α ) and PAP1-α ( PAP1-a/ Δ pap1-α ), only the former led to relatively enhanced drug resistance, to polyadenylation and to transcript stability of CDR1 in the AS isolate. This suggests a dominant negative role of PAP1-a in CDR1 transcript polyadenylation and stability. Taken together, our study provides the first evidence, to our knowledge, that loss of heterozygosity at the PAP1 locus is linked to hyperadenylation and subsequent increased stability of CDR1 transcripts, thus contributing to enhanced drug resistance." @default.
• W2156106543 created "2016-06-24" @default.
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• W2156106543 date "2010-02-01" @default.
• W2156106543 modified "2023-10-16" @default.
• W2156106543 title "PAP1 [poly(A) polymerase 1] homozygosity and hyperadenylation are major determinants of increased mRNA stability of CDR1 in azole-resistant clinical isolates of Candida albicans" @default.
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• W2156106543 doi "https://doi.org/10.1099/mic.0.035154-0" @default.
• W2156106543 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19910410" @default.
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