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Selection of optimal host strain for molecular pathogenesis studies on Cryptococcus gattii
Sudha Chaturvedi1, Ping Ren, Srinivas D Narasipura
1Mycology Laboratory, Wadsworth Center, New York State Department of Health, Albany, NY 12208-2002, USA. schaturv@wadsworth.org
Mycopathologia
|October 6, 2005
Summary
Cryptococcus gattii strain NIH444 is more virulent and better suited for studying North American fungal infections than strain WM276. NIH444 exhibits robust mating and a genotype linked to recent outbreaks.
Area of Science:
- Mycology
- Infectious Diseases
- Molecular Pathogenesis
Background:
- Cryptococcus gattii (Cg) is an emerging fungal pathogen causing central nervous system infections.
- Strain NIH444 is a North American isolate, while WM276 is an Australian environmental isolate.
- Understanding Cg pathogenesis is crucial for public health.
Purpose of the Study:
- To compare the biological characteristics and pathogenic potential of Cg strains NIH444 and WM276.
- To determine the suitability of NIH444 for molecular pathogenesis studies in North America.
Main Methods:
- Virulence assessment in a mouse model of cryptococcosis.
- Mating assays with Cg MATa strain NIH198.
- Evaluation of filamentation and sporulation (haploid fruiting).
- Genotyping (VGII/AFLP6) and comparative gene sequencing.
Main Results:
- NIH444 demonstrated higher virulence in the mouse model compared to WM276.
- NIH444 exhibited robust mating, whereas WM276 did not.
- WM276 was defective in filamentation and sporulation, unlike NIH444.
- NIH444 shares a genotype (VGII/AFLP6) with recent Canadian outbreak strains.
Conclusions:
- Strain NIH444 is more virulent and biologically relevant for studying North American Cg pathogenesis.
- NIH444's characteristics make it the preferred strain for ongoing research on this continent.