Isolate Specific Transcriptome Changes Exerted by Isavuconazole Treatment in Candida auris.

Area of Science:

• Mycology
• Antimicrobial Resistance
• Molecular Biology

Background:

• Candida auris is a multidrug-resistant fungus causing global health challenges.
• Limited treatment options necessitate exploring novel therapeutic strategies.
• Combination therapies, such as echinocandin and isavuconazole (ISA), show promise.

Purpose of the Study:

• To investigate the molecular mechanisms of isavuconazole (ISA) action in Candida auris.
• To analyze gene transcription profiles of wild-type (WT) and non-wild type (non-WT) C. auris isolates after ISA exposure.

Main Methods:

• Total RNA sequencing was employed to analyze gene expression.
• Comparison of gene transcription profiles between ISA-treated and untreated C. auris isolates (WT and non-WT).
• Non-WT isolate defined by a tentative epidemiological cut-off value of ≤1 mg/L.

Main Results:

• ISA treatment significantly altered gene expression in both WT and non-WT C. auris isolates.
• Upregulation of genes involved in ergosterol biosynthesis, drug transport (MDR1), and transcriptional regulation (UPC2) was observed.
• WT isolates showed enrichment in genes related to sphingolipid biosynthesis, adhesion, and drug transport, suggesting membrane lipid alterations.

Conclusions:

• Alterations in membrane lipid composition and drug efflux transporter modulation are crucial for ISA susceptibility in WT C. auris.
• Understanding these mechanisms can guide the development of effective combination therapies against C. auris infections.
• This research provides insights into overcoming resistance in this critical fungal pathogen.