Artemisinin resistance phenotypes and K13 inheritance in a Plasmodium falciparum cross and Aotus model.

Journal Article (Journal Article)

Concerns about malaria parasite resistance to treatment with artemisinin drugs (ARTs) have grown with findings of prolonged parasite clearance t 1/2 s (>5 h) and their association with mutations in Plasmodium falciparum Kelch-propeller protein K13. Here, we describe a P. falciparum laboratory cross of K13 C580Y mutant with C580 wild-type parasites to investigate ART response phenotypes in vitro and in vivo. After genotyping >400 isolated progeny, we evaluated 20 recombinants in vitro: IC50 measurements of dihydroartemisinin were at similar low nanomolar levels for C580Y- and C580-type progeny (mean ratio, 1.00; 95% CI, 0.62-1.61), whereas, in a ring-stage survival assay, the C580Y-type progeny had 19.6-fold (95% CI, 9.76-39.2) higher average counts. In splenectomized Aotus monkeys treated with three daily doses of i.v. artesunate, t 1/2 calculations by three different methods yielded mean differences of 0.01 h (95% CI, -3.66 to 3.67), 0.80 h (95% CI, -0.92 to 2.53), and 2.07 h (95% CI, 0.77-3.36) between C580Y and C580 infections. Incidences of recrudescence were 57% in C580Y (4 of 7) versus 70% in C580 (7 of 10) infections (-13% difference; 95% CI, -58% to 35%). Allelic substitution of C580 in a C580Y-containing progeny clone (76H10) yielded a transformant (76H10C580Rev ) that, in an infected monkey, recrudesced regularly 13 times over 500 d. Frequent recrudescences of ART-treated P. falciparum infections occur with or without K13 mutations and emphasize the need for improved partner drugs to effectively eliminate the parasites that persist through the ART component of combination therapy.

Full Text

Duke Authors

Cited Authors

  • Sá, JM; Kaslow, SR; Krause, MA; Melendez-Muniz, VA; Salzman, RE; Kite, WA; Zhang, M; Moraes Barros, RR; Mu, J; Han, PK; Mershon, JP; Figan, CE; Caleon, RL; Rahman, RS; Gibson, TJ; Amaratunga, C; Nishiguchi, EP; Breglio, KF; Engels, TM; Velmurugan, S; Ricklefs, S; Straimer, J; Gnädig, NF; Deng, B; Liu, A; Diouf, A; Miura, K; Tullo, GS; Eastman, RT; Chakravarty, S; James, ER; Udenze, K; Li, S; Sturdevant, DE; Gwadz, RW; Porcella, SF; Long, CA; Fidock, DA; Thomas, ML; Fay, MP; Sim, BKL; Hoffman, SL; Adams, JH; Fairhurst, RM; Su, X-Z; Wellems, TE

Published Date

  • December 2018

Published In

Volume / Issue

  • 115 / 49

Start / End Page

  • 12513 - 12518

PubMed ID

  • 30455312

Pubmed Central ID

  • PMC6298093

Electronic International Standard Serial Number (EISSN)

  • 1091-6490

International Standard Serial Number (ISSN)

  • 0027-8424

Digital Object Identifier (DOI)

  • 10.1073/pnas.1813386115


  • eng