Independent lineages of highly sulfadoxine-resistant Plasmodium falciparum haplotypes, eastern Africa.

Journal Article (Journal Article)

Sulfadoxine-resistant Plasmodium falciparum undermines malaria prevention with sulfadoxine/pyrimethamine. Parasites with a highly resistant mutant dihydropteroate synthase (dhps) haplotype have recently emerged in eastern Africa; they negated preventive benefits of sulfadoxine/pyrimethamine, and might exacerbate placental malaria. We explored emerging lineages of dhps mutant haplotypes in Malawi, the Democratic Republic of the Congo, and Tanzania by using analyses of genetic microsatellites flanking the dhps locus. In Malawi, a triple-mutant dhps SGEG (mutant amino acids are underlined) haplotype emerged in 2010 that was closely related to pre-existing double-mutant SGEA haplotypes, suggesting local origination in Malawi. When we compared mutant strains with parasites from the Democratic Republic of the Congo and Tanzania by multiple independent analyses, we found that SGEG parasites were partitioned into separate lineages by country. These findings support a model of local origination of SGEG dhps haplotypes, rather than geographic diffusion, and have implications for investigations of emergence and effects of parasite drug resistance.

Full Text

Duke Authors

Cited Authors

  • Taylor, SM; Antonia, AL; Harrington, WE; Goheen, MM; Mwapasa, V; Chaluluka, E; Fried, M; Kabyemela, E; Madanitsa, M; Khairallah, C; Kalilani-Phiri, L; Tshefu, AK; Rogerson, SJ; Ter Kuile, FO; Duffy, PE; Meshnick, SR

Published Date

  • July 2014

Published In

Volume / Issue

  • 20 / 7

Start / End Page

  • 1140 - 1148

PubMed ID

  • 24960247

Pubmed Central ID

  • PMC4073871

Electronic International Standard Serial Number (EISSN)

  • 1080-6059

Digital Object Identifier (DOI)

  • 10.3201/eid2007.131720


  • eng

Conference Location

  • United States