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Updated: Jun 18, 2026
Biolistic Transformation of a Fluorescent Tagged Gene into the Opportunistic Fungal Pathogen Cryptococcus neoformans
Published on: March 19, 2015
Going green in Cryptococcus neoformans: the recycling of a selectable drug marker
Raunak D Patel1, Jennifer K Lodge, Lorina G Baker
1Department of Molecular Microbiology, Washington University School of Medicine, 660 S. Euclid Avenue, Saint Louis, MO 63110, USA.
Abstract:
Cryptococcus neoformans is an opportunistic fungal pathogen that primarily affects immunocompromised individuals. Reverse genetics is commonly used to identify and characterize genes involved in a variety of cellular processes. In C. neoformans there is a limited set of positive selectable markers available to make gene deletions or other genetic manipulations. This has hampered the application of reverse genetics in this organism. We have adapted the Bacteriophage P1 Cre-loxP system for use in C. neoformans and successfully excised and reused the same drug marker, G418, to make two sequential gene deletions, lac1Delta and cap59Delta, in the same strain. This tool will allow investigators to make multiple sequential gene deletions in the same strain, which should facilitate the analysis of multigene families.
Insights
Researchers adapted the Cre-loxP system for Cryptococcus neoformans, enabling sequential gene deletions. This new tool facilitates the study of fungal pathogens by allowing reuse of drug markers, simplifying genetic analysis.
Area of Science:
- Medical Mycology
- Molecular Biology
- Genetics
Background:
- Cryptococcus neoformans is an opportunistic fungal pathogen affecting immunocompromised individuals.
- Reverse genetics is crucial for understanding gene function in C. neoformans.
- Limited selectable markers hinder genetic manipulation in C. neoformans.
Purpose of the Study:
- To adapt the Bacteriophage P1 Cre-loxP system for C. neoformans.
- To enable sequential gene deletions and marker reuse in C. neoformans.
- To facilitate the genetic analysis of C. neoformans.
Main Methods:
- Adaptation of the Cre-loxP recombination system.
- Sequential gene deletion using the G418 drug marker.
- Genetic manipulation in C. neoformans strains.
Main Results:
- Successful excision and reuse of the G418 drug marker.
- Two sequential gene deletions (lac1Δ and cap59Δ) were achieved in the same strain.
- Demonstrated the utility of the Cre-loxP system in C. neoformans.
Conclusions:
- The adapted Cre-loxP system is a valuable tool for C. neoformans research.
- This system simplifies multiple sequential gene deletions, aiding in multigene family analysis.
- Facilitates advanced reverse genetics studies in this important fungal pathogen.
