Engineering a High-Fidelity CRISPR-Cas13d System for Targeted RNA Depletion in Plasmodium falciparum
Functional genomics in Plasmodium falciparum is severely constrained by the evolutionary absence of an endogenous RNA interference pathway and the requirement for time-consuming direct target locus modification by conventional conditional genetic engineering systems. To overcome these limitations, we established a programmable post-transcriptional gene silencing system in P. falciparum using…
In a significant advancement for malaria research, scientists have developed a precise RNA-depletion system targeting Plasmodium falciparum, the parasite responsible for the most lethal form of malaria. This innovative approach, utilizing a high-fidelity Cas13d (HF-RfxCas13d), addresses limitations encountered in functional genomics due to the parasite's evolutionary lack of an endogenous RNA interference pathway.
By strategically integrating the HF-RfxCas13d expression cassette at the dispensable pfs47 locus, researchers created a stable transgenic line with constitutive cytosolic expression of HF-RfxCas13d. This development allowed for gene silencing without compromising the parasite's ability to grow and reproduce within host erythrocytes.
The researchers employed CRISPR-SpyCas9 to introduce single or dual guide RNAs (gRNAs) targeting three endogenous loci—ap4, ap2-exp, and ap2-g. This approach led to substantial mRNA depletion (ranging from 41% to 76%) of the targeted genes, offering a powerful tool for functional genomics in P. falciparum.
The system's application to the master transcriptional regulator of gametocytogenesis (ap2-g) showcased its potential. Depletion of ap2-g functionally impaired sexual differentiation in committed parasites, resulting in a notable 70% reduction in Sexual Conversion Rate. This breakthrough could accelerate the identification of potential drug targets and streamline malaria research efforts, providing a scalable and non-locus-modifying addition to the genetic toolbox for studying P. falciparum.
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