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Robust inducible Cre recombinase activity in the human malaria parasite P lasmodium falciparum enables efficient gene deletion within a single asexual erythrocytic growth cycle

Christine R. Collins, Sujaan Das, Eleanor H. Wong and 7 more

Molecular Microbiology · 2013

doi:10.1111/mmi.12206

Abstract

Summary Asexual blood stages of the malaria parasite, which cause all the pathology associated with malaria, can readily be genetically modified by homologous recombination, enabling the functional study of parasite genes that are not essential in this part of the life cycle. However, no widely applicable method for conditional mutagenesis of essential asexual blood‐stage malarial genes is available, hindering their functional analysis. We report the application of the DiCre conditional recombinase system to P lasmodium falciparum , the causative agent of the most dangerous form of malaria. We show that DiCre can be used to obtain rapid, highly regulated site‐specific recombination in P . falciparum , capable of excising loxP ‐flanked sequences from a genomic locus with close to 100% efficiency within the time‐span of a single erythrocytic growth cycle. DiCre ‐mediated deletion of the SERA5 3' UTR failed to reduce expression of the gene due to the existence of alternative cryptic polyadenylation sites within the modified locus. However, we successfully used the system to recycle the most widely used drug resistance marker for P . falciparum , human dihydrofolate reductase, in the process producing constitutively DiCre ‐expressing P . falciparum clones that have broad utility for the functional analysis of essential asexual blood‐stage parasite genes.

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