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Whole Genome Sequencing of Candida glabrata for Detection of Markers of Antifungal Drug Resistance
Published on: December 28, 2017
Fungal echinocandin resistance
Louise A Walker1, Neil A R Gow, Carol A Munro
1School of Medical Sciences, University of Aberdeen, Aberdeen, AB25 2ZD, UK.
Fungal Genetics and Biology : FG & B
|September 23, 2009
Summary
Echinocandins fight fungal infections by inhibiting beta-(1,3)-glucan synthesis. Fungal resistance emerges from mutations in Fks1 or compensatory chitin upregulation, decreasing drug susceptibility.
Area of Science:
- Mycology
- Biochemistry
- Pharmacology
Background:
- Echinocandins are a novel class of antifungal drugs.
- They inhibit beta-(1,3)-glucan synthesis, a key fungal cell wall component.
- Fungal resistance mechanisms are critical to understand for effective treatment.
Purpose of the Study:
- To investigate mechanisms of fungal resistance to echinocandins.
- To explore both genetic and physiological alterations contributing to resistance.
- To understand how fungi adapt to echinocandin therapy.
Main Methods:
- Analysis of spontaneous mutations in Fks1 hot spot regions.
- Isolation and characterization of echinocandin-resistant fungal strains with unaltered FKS1.
- Investigation of cell wall compensatory mechanisms, including chitin synthesis.
Main Results:
- Spontaneous mutations in Fks1 hot spot regions confer reduced echinocandin sensitivity.
- Fungal strains with wild-type FKS1 also exhibit decreased echinocandin sensitivity.
- Echinocandin treatment can induce compensatory upregulation of chitin synthesis, strengthening the cell wall.
Conclusions:
- Fungal resistance to echinocandins can result from stable genetic mutations or reversible physiological adaptations.
- Understanding these dual resistance mechanisms is crucial for developing strategies against echinocandin-tolerant fungi.
- Compensatory chitin synthesis represents a significant physiological resistance pathway.
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