Volume 85, Issue 1
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



dihydrofolate reductase () and dihydropteroate synthase () genes are reliable molecular markers for antifolate resistance. The . ATPase 6 () gene has been proposed to be a potential marker for artemisinin resistance. In our previous clinical study, we showed that artesunate-sulfadoxine-pyrimethamine is highly effective against uncomplicated malaria in Yaoundé, Cameroon. In the present study, , , and mutations in isolates obtained from children treated with artesunate-sulfadoxine-pyrimethamine were determined. All 61 isolates had wild-type 263, 623, and 769 alleles, and 11 (18%) had a single E431K substitution. Three additional mutations, E643Q, E432K, and E641Q, were detected. The results did not indicate any warning signal of serious concern (i.e., no parasites were seen with quintuple -, DHFR Ile164Leu, or mutations), as confirmed by the high clinical efficacy of artesunate-sulfadoxine-pyrimethamine. Further studies are required to identify a molecular marker that reliably predicts artemisinin resistance.


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  • Received : 20 Sep 2010
  • Accepted : 09 Mar 2011
  • Published online : 01 Jul 2011

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