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UDP-galactose and acetyl-CoA transporters as Plasmodium multidrug resistance genes

Abstract

A molecular understanding of drug resistance mechanisms enables surveillance of the effectiveness of new antimicrobial therapies during development and deployment in the field. We used conventional drug resistance selection as well as a regime of limiting dilution at early stages of drug treatment to probe two antimalarial imidazolopiperazines, KAF156 and GNF179. The latter approach permits the isolation of low-fitness mutants that might otherwise be out-competed during selection. Whole-genome sequencing of 24 independently derived resistant Plasmodium falciparum clones revealed four parasites with mutations in the known cyclic amine resistance locus (pfcarl) and a further 20 with mutations in two previously unreported P. falciparum drug resistance genes, an acetyl-CoA transporter (pfact) and a UDP-galactose transporter (pfugt). Mutations were validated both in vitro by CRISPR editing in P. falciparum and in vivo by evolution of resistant Plasmodium berghei mutants. Both PfACT and PfUGT were localized to the endoplasmic reticulum by fluorescence microscopy. As mutations in pfact and pfugt conveyed resistance against additional unrelated chemical scaffolds, these genes are probably involved in broad mechanisms of antimalarial drug resistance.

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Figure 1: Selection of imidazolopiperazine-resistant mutants.
Figure 2: Characterization of resistance mutations.
Figure 3: CRISPR/Cas9 mutation validation and localization of PfUGT and PfACT.
Figure 4: GNF179-resistant mutants display poor fitness.
Figure 5: Cross resistance against a panel of imidazolopiperazine analogues and unrelated antimalarial compounds.

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Acknowledgements

M.Y.L. is supported by the Economic Development Board—Industrial Postgraduate Programme (EDB-IPP) scholarship. G.L. is supported by an A.P. Giannini Post-Doctoral Fellowship. Work at UCSD was supported by grants from the National Institutes of Health (NIH; R01 AI090141 and R01 AI103058) to E.A.W. D.A.F. acknowledges support from the Medicines for Malaria Venture. B.M. and L.R. are supported by the Singapore Immunology Network under the Agency for Science, Technology and Research (A*STAR, Singapore). R.W. is a Research Associate at the National Fund for Scientific Research FNRS-FRS (Belgium). The authors thank C. Jensen (Leiden University Medical Center, Netherlands) for the donation of the P. berghei ANKA strain.

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M.Y.-X.L., G.L., M.C.S.L., E.A.W. and P.B. designed the experiments. M.Y.-X.L., G.L., M.C.S.L., C.R., B.H.T., V.C., B.F.T., A.C., M.N., B.M., E.D.C. and L.L. performed the experiments. Modelling work was performed by R.W. M.Y.-X.L., G.L., M.C.S.L., C.R., V.C., M.N., E.D.C. and P.G. analysed the data. G.M.C.B., P.C.-L.H., L.R., D.A.F. and T.T.D. contributed support. M.Y.-X.L., G.L., M.C.S.L., B.K.S.Y., D.A.F., E.A.W. and P.B. wrote and proofread the manuscript. E.A.W. and P.B. gave technical support and conceptual advice. The manuscript was edited by all authors.

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Correspondence to Elizabeth A. Winzeler or Pablo Bifani.

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Lim, MX., LaMonte, G., Lee, M. et al. UDP-galactose and acetyl-CoA transporters as Plasmodium multidrug resistance genes. Nat Microbiol 1, 16166 (2016). https://doi.org/10.1038/nmicrobiol.2016.166

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