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New selectable markers and single crossover integration for the highly versatile Plasmodium knowlesi transfection
Annemarie v d Wel1, Clemens H M Kocken, Tamarah C Pronk
1Department of Parasitology, Biomedical Primate Research Centre, P.O. Box 3306, 2280 GH, Rijswijk, The Netherlands.
Molecular and Biochemical Parasitology
|January 30, 2004
Summary
New selectable markers enhance Plasmodium knowlesi transfection. Researchers developed positive markers (hdhfr, bsd, neo) and a negative marker (thymidine kinase) for malaria parasite genetic modification, improving research flexibility.
Area of Science:
- Malariology
- Parasitology
- Molecular Biology
Background:
- Plasmodium knowlesi is a versatile malaria parasite transfection system.
- Current limitations include a lack of selectable markers for multiple genetic manipulations.
Purpose of the Study:
- To develop novel positive and negative selectable markers for P. knowlesi.
- To enhance the genetic manipulation capabilities of P. knowlesi.
Main Methods:
- Tested positive selectable markers: human dihydrofolate reductase (hdhfr), blasticidin S deaminase (bsd), and neomycin phosphotransferase II (neo).
- Introduced markers as episomes into P. knowlesi.
- Assessed thymidine kinase as a negative selectable marker.
- Investigated single crossover integration using a linear fragment with the hdhfr marker.
Main Results:
- hdhfr, bsd, and neo conferred drug resistance in P. knowlesi.
- Single crossover integration was achieved with the hdhfr marker.
- Recombinant P. knowlesi expressing thymidine kinase showed high sensitivity to ganciclovir.
Conclusions:
- New positive selectable markers (hdhfr, bsd, neo) and a candidate negative marker (thymidine kinase) expand P. knowlesi transfection capabilities.
- Targeted single crossover integration increases system flexibility.
- P. knowlesi is a highly versatile Plasmodium transfection system.