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Plasmodium  parasites, the causative agent of malaria infections, rapidly evolve drug resistance and escape detection by the human immune response via the incredible mutability of its genome. Understanding the genetic mechanisms by which  Plasmodium  parasites develop antimalarial resistance is essential to understanding why most drugs fail in the clinic and designing the next generation of therapies. A systematic genomic analysis of 262  Plasmodium falciparum  clones with stable in vitro resistance to 37 diverse compounds with potent antimalarial activity was undertaken with the main goal of identifying new drug targets. Despite several challenges inherent to this method of in vitro drug resistance generation followed by whole genome sequencing, the study was able to identify a likely drug target or resistance gene for every compound for which resistant parasites could be generated. Known and novel  P falciparum  resistance mediators were discovered along with several new promising antimalarial drug targets. Surprisingly, gene amplification events contributed to one-third of the drug resistance acquisition events. The study can serve as a model for drug discovery and resistance analyses in other similar microbial pathogens amenable to in vitro culture.

Exploration of the Plasmodium falciparum Resistome and Druggable Genome Reveals New Mechanisms of Drug Resistance and Antimalarial Targets