Site-specific genome editing in Plasmodium falciparum using engineered zinc-finger nucleases.

Nat Methods 2012 Oct 26;9(10):993-8. Epub 2012 Aug 26.

Department of Microbiology & Immunology, Columbia University College of Physicians and Surgeons, New York, New York, USA.

Malaria afflicts over 200 million people worldwide, and its most lethal etiologic agent, Plasmodium falciparum, is evolving to resist even the latest-generation therapeutics. Efficient tools for genome-directed investigations of P. falciparum-induced pathogenesis, including drug-resistance mechanisms, are clearly required. Here we report rapid and targeted genetic engineering of this parasite using zinc-finger nucleases (ZFNs) that produce a double-strand break in a user-defined locus and trigger homology-directed repair. Targeting an integrated egfp locus, we obtained gene-deletion parasites with unprecedented speed (2 weeks), both with and without direct selection. ZFNs engineered against the parasite gene pfcrt, responsible for escape under chloroquine treatment, rapidly produced parasites that carried either an allelic replacement or a panel of specified point mutations. This method will enable a diverse array of genome-editing approaches to interrogate this human pathogen.

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http://dx.doi.org/10.1038/nmeth.2143DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3697006PMC
October 2012
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