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- W2625753990 abstract "ABSTRACT Aspergillus niger and its related species, known as Aspergillus section Nigri , are ubiquitously distributed across the globe and are often isolated from clinical specimens. In Japan, Aspergillus section Nigri is second most often isolated from clinical specimens following Aspergillus fumigatus . We determined the species of Aspergillus section Nigri isolated in Japan by DNA sequencing of partial β-tubulin genes and investigated drug susceptibility by the CLSI M38-A2 method. The collection contained 20 Aspergillus niger , 59 Aspergillus welwitschiae , and 39 Aspergillus tubingensis strains. Drug susceptibility testing revealed 30 to 55% of A. niger , 6.8 to 18.6% of A. welwitschiae , and 79.5 to 89.7% of A. tubingensis isolates to be less susceptible (so-called resistant) to itraconazole (ITC) and/or voriconazole (VRC) according to the epidemiologic cutoff values (ECVs) proposed for A. niger previously. MIC distributions of ITC or VRC showed no remarkable differences between clinical and environmental isolates. When the cyp51A sequences were compared between susceptible and resistant strains, 18 amino acid mutations were specific for resistant isolates of A. niger and A. tubingensis ; however, none of them were confirmed to be associated with azole resistance. Three nonrelated A. welwitschiae isolates possessed a partial deletion in cyp51A , likely attributable to being more susceptible to azoles than other isolates. One of five ITC-resistant A. tubingensis isolates showed higher expression of cyp51A than did susceptible strains. Our results show that cyp51A point mutations may have no association with azole resistance but that in some cases the overexpression of cyp51A may lead to the azole resistance in these species." @default.
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- W2625753990 date "2017-08-01" @default.
- W2625753990 modified "2023-10-16" @default.
- W2625753990 title "Drug Sensitivity and Resistance Mechanism in Aspergillus Section <i>Nigri</i> Strains from Japan" @default.
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- W2625753990 doi "https://doi.org/10.1128/aac.02583-16" @default.
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