ArticleAMB Express2024
An efficient gene targeting system using Δku80 and functional analysis of Cyp51A in Trichophyton rubrum.
Article in AMB Express, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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4 citing papers in PubMed.
- Treating Onychomycosis with Efinaconazole: Considerations for Diverse Patient Groups.Journal of fungi (Basel, Switzerland) · 2025Review
- Synergistic effects of Cyp51 isozyme-specific azole antifungal agents on fungi with multipleAntimicrobial agents and chemotherapy · 2025Article
- The Significance of Mono- and Dual-Effective Agents in the Development of New Antifungal Strategies.Chemical biology & drug design · 2025Review
- Small GTPase Rac promotes hyphal formation and microconidiogenesis inSmall GTPases · 2024Article
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3 authors.
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Abstract
Trichophyton rubrum is one of the most frequently isolated fungi in patients with dermatophytosis. Despite its clinical significance, the molecular mechanisms of drug resistance and pathogenicity of T. rubrum remain to be elucidated because of the lack of genetic tools, such as efficient gene targeting systems. In this study, we generated a T. rubrum strain that lacks the nonhomologous end-joining-related gene ku80 (Δku80) and then developed a highly efficient genetic recombination system with gene targeting efficiency that was 46 times higher than that using the wild-type strain. Cyp51A and Cyp51B are 14-α-lanosterol demethylase isozymes in T. rubrum that promote ergosterol biosynthesis and are the targets of azole antifungal drugs. The expression of cyp51A mRNA was induced by the addition of the azole antifungal drug efinaconazole, whereas no such induction was detected for cyp51B, suggesting that Cyp51A functions as an azole-responsive Cyp51 isozyme. To explore the contribution of Cyp51A to susceptibility to azole drugs, the neomycin phosphotransferase (nptII) gene cassette was inserted into the cyp51A 3'-untranslated region of Δku80 to destabilize the mRNA of cyp51A. In this mutant, the induction of cyp51A mRNA expression by efinaconazole was diminished. The minimum inhibitory concentration for several azole drugs of this strain was reduced, suggesting that dermatophyte Cyp51A contributes to the tolerance for azole drugs. These findings suggest that an efficient gene targeting system using Δku80 in T. rubrum is applicable for analyzing genes encoding drug targets.
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