Reverse genetic screen identifies malaria parasite genes required for gametocyte-to-sporozoite development in its mosquito host
Ukegbu, C. V.; Gomes, A. R.; Giorgalli, M.; Campos, M.; Bailey, A. J.; Besson, T. R.; Billker, O.; Vlachou, D.; Christophides, G. K.
Show abstract
Malaria remains one of the most devastating infectious diseases. Reverse genetic screens offer a powerful approach to identify genes and molecular processes governing malaria parasite biology. However, sexual reproduction and complex regulation of gene expression and genotype-phenotype associations in the mosquito have hampered the development of screens in this key part of the parasite lifecycle. We designed a genetic approach in the rodent parasite Plasmodium berghei, which in conjunction with barcode sequencing allowed us to overcome the fertilization roadblock and screen for gametocyte-expressed genes required for parasite infection of the mosquito Anopheles coluzzii. The results confirmed previous findings, validating our approach for scaling up, and identified new genes required for ookinete motility and mosquito midgut infection and for sporozoite development and oocyst egress and salivary gland infection. Our findings can assist efforts to study malaria transmission biology and develop new interventions to control disease transmission.
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