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Updated: Jun 27, 2025
Whole Genome Sequencing of Candida glabrata for Detection of Markers of Antifungal Drug Resistance
Published on: December 28, 2017
Molecular mechanisms governing antifungal drug resistance
Yunjin Lee1, Nicole Robbins1, Leah E Cowen1
1Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1M1 Canada.
Abstract:
Fungal pathogens are a severe public health problem. The leading causative agents of systemic fungal infections include species from the Candida, Cryptococcus, and Aspergillus genera. As opportunistic pathogens, these fungi are generally harmless in healthy hosts; however, they can cause significant morbidity and mortality in immunocompromised patients. Despite the profound impact of pathogenic fungi on global human health, the current antifungal armamentarium is limited to only three major classes of drugs, all of which face complications, including host toxicity, unfavourable pharmacokinetics, or limited spectrum of activity. Further exacerbating this issue is the growing prevalence of antifungal-resistant infections and the emergence of multidrug-resistant pathogens. In this review, we discuss the diverse strategies employed by leading fungal pathogens to evolve antifungal resistance, including drug target alterations, enhanced drug efflux, and induction of cellular stress response pathways. Such mechanisms of resistance occur through diverse genetic alterations, including point mutations, aneuploidy formation, and epigenetic changes given the significant plasticity observed in many fungal genomes. Additionally, we highlight recent literature surrounding the mechanisms governing resistance in emerging multidrug-resistant pathogens including Candida auris and Candida glabrata. Advancing our knowledge of the molecular mechanisms by which fungi adapt to the challenge of antifungal exposure is imperative for designing therapeutic strategies to tackle the emerging threat of antifungal resistance.
Insights
Pathogenic fungi pose a significant public health threat, with resistance to antifungal drugs growing. Understanding fungal resistance mechanisms is crucial for developing new treatments against these opportunistic infections.
Area of Science:
- Medical Mycology
- Antimicrobial Resistance
- Molecular Biology
Background:
- Fungal pathogens like Candida, Cryptococcus, and Aspergillus cause severe infections, particularly in immunocompromised individuals.
- Current antifungal drugs have limitations including toxicity, poor pharmacokinetics, and a narrow spectrum of activity.
- Antifungal resistance and the emergence of multidrug-resistant strains are escalating global health concerns.
Purpose of the Study:
- To review the diverse strategies employed by fungal pathogens to develop antifungal resistance.
- To highlight mechanisms of resistance in emerging multidrug-resistant pathogens such as Candida auris.
- To emphasize the need for advancing knowledge on fungal adaptation to antifungal exposure for therapeutic development.
Main Methods:
- Review of current literature on fungal resistance mechanisms.
- Analysis of genetic alterations (point mutations, aneuploidy, epigenetic changes) contributing to resistance.
- Focus on specific pathogens like Candida auris and Candida glabrata.
Main Results:
- Fungal pathogens utilize mechanisms such as drug target alteration, enhanced drug efflux, and stress response pathways to resist antifungals.
- Genetic plasticity in fungal genomes facilitates the evolution of resistance.
- Emerging multidrug-resistant pathogens present a significant challenge due to complex resistance profiles.
Conclusions:
- Understanding the molecular basis of fungal antifungal resistance is essential for combating infections.
- Developing novel therapeutic strategies requires in-depth knowledge of how fungi adapt to antifungal drugs.
- Continued research is imperative to address the growing threat of antifungal resistance in clinical settings.
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