How fungal multidrug transporters mediate hyper resistance through DNA amplification and mutation

Area of Science:

• Biochemistry
• Molecular Biology
• Pharmacology

Background:

• Antifungal resistance is a major clinical challenge.
• ATP-binding cassette (ABC) and major facilitator superfamily (MFS) transporters in the plasma membrane are key mediators of this resistance.
• Understanding the mechanisms of resistance is crucial for developing effective antifungal therapies.

Purpose of the Study:

• To review the diverse mechanisms underlying antifungal resistance mediated by ABC and MFS transporters.
• To highlight recent discoveries in non-traditional resistance pathways.
• To provide a comprehensive overview for researchers and clinicians.

Main Methods:

• Literature review of existing studies on antifungal resistance mechanisms.
• Analysis of genetic and molecular alterations leading to transporter overexpression.
• Examination of novel resistance pathways involving mRNA stability and transporter cooperativity.

Main Results:

• Antifungal resistance is frequently driven by overexpression of ABC and MFS transporters.
• Mechanisms for overexpression include DNA amplification and gain-of-function mutations in transcription factors.
• Emerging resistance mechanisms involve mutations affecting mRNA stability and altered drug-binding cooperativity in transporters like yeast Pdr5.

Conclusions:

• Antifungal resistance is a complex phenomenon involving multiple genetic and molecular mechanisms.
• Transporter overexpression remains a primary driver, facilitated by genetic alterations.
• Novel resistance pathways offer new targets for therapeutic intervention against fungal infections.