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A controllable gene-expression system for the pathogenic fungus Candida glabrata
Hironobu Nakayama1, Miho Izuta1, Shigehisa Nagahashi1
1Department of Mycology, Nippon Roche Research Center,200 Kajiwara, Kamakura, Kanagawa 247,Japan.
Microbiology (Reading, England)
|October 23, 1998
Summary
A novel gene expression control system in Candida glabrata allows researchers to study gene function. Doxycycline-mediated repression of key genes like CgTEF3 and CgTOP2 impacts fungal growth and survival in vivo.
Area of Science:
- Mycology
- Molecular Biology
- Fungal Pathogenesis
Background:
- Understanding gene function is crucial for studying pathogenic fungi like Candida glabrata.
- Existing methods for gene manipulation in C. glabrata have limitations.
Purpose of the Study:
- To establish a tetracycline-inducible system for controlling gene expression in C. glabrata.
- To investigate the physiological roles of CgTEF3 and CgTOP2 using this system.
Main Methods:
- Transformation of C. glabrata with plasmids for tetracycline repressor-transactivator fusion (tetR::GAL4) and a controllable promoter (tetO::ScHOP1).
- Cloning and expression analysis of C. glabrata peptide elongation factor 3 (CgTEF3) and DNA topoisomerase II (CgTOP2) genes.
- Assessment of gene repression effects on fungal growth, mRNA levels, and survival in a mouse infection model.
Main Results:
- Doxycycline effectively repressed CgTEF3 and CgTOP2 gene expression, leading to impaired fungal growth.
- Repression of these genes significantly reduced C. glabrata survival and proliferation in mouse kidneys.
- The gene repression was effective both in vitro and in vivo.
Conclusions:
- The developed tetracycline-inducible system provides a robust tool for functional genomics in C. glabrata.
- CgTEF3 and CgTOP2 are essential for C. glabrata growth and pathogenesis.
- This system is valuable for studying fungal gene function during infection and host-pathogen interactions.