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© Thierry Blisnick & Philippe Bastin, Institut Pasteur
Bloodstream Trypanosoma brucei cell
Publication : Malaria journal

Generation of transgenic rodent malaria parasites by transfection of cell culture-derived merozoites.

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Malaria journal - 01 Aug 2017

Kaiser G, De Niz M, Burda PC, Niklaus L, Stanway RL, Heussler V,

Link to Pubmed [PMID] – 28764716

Link to DOI – 10.1186/s12936-017-1949-y

Malar J 2017 08; 16(1): 305

Malaria research is greatly dependent on and has drastically advanced with the possibility of genetically modifying Plasmodium parasites. The commonly used transfection protocol by Janse and colleagues utilizes blood stage-derived Plasmodium berghei schizonts that have been purified from a blood culture by density gradient centrifugation. Naturally, this transfection protocol depends on the availability of suitably infected mice, constituting a time-based variable. In this study, the potential of transfecting liver stage-derived merozoites was explored. In cell culture, upon merozoite development, infected cells detach from the neighbouring cells and can be easily harvested from the cell culture supernatant. This protocol offers robust experimental timing and temporal flexibility.HeLa cells are infected with P. berghei sporozoites to obtain liver stage-derived merozoites, which are harvested from the cell culture supernatant and are transfected using the Amaxa Nucleofector® electroporation technology.Using this protocol, wild type P. berghei ANKA strain and marker-free PbmCherryHsp70-expressing P. berghei parasites were successfully transfected with DNA constructs designed for integration via single- or double-crossover homologous recombination.An alternative protocol for Plasmodium transfection is hereby provided, which uses liver stage-derived P. berghei merozoites for transfection. This protocol has the potential to substantially reduce the number of mice used per transfection, as well as to increase the temporal flexibility and robustness of performing transfections, if mosquitoes are routinely present in the laboratory. Transfection of liver stage-derived P. berghei parasites should enable generation of transgenic parasites within 8-18 days.

https://pubmed.ncbi.nlm.nih.gov/28764716