title: High prevalence and fixation of Plasmodium vivax dhfr/dhps mutations related to sulfadoxine/pyrimethamine resistance in French Guiana.
abstract: Plasmodium vivax isolates from French Guiana were studied for the presence of mutations associated with sulfadoxine/pyrimethamine (SP) drug resistance. Ninety-six blood samples were collected from 2000 to 2005 from symptomatic malaria patients. SP drug resistance was predicted by determining point mutations in the dihydrofolate reductase (pvdhfr) and dihydropteroate synthase (pvdhps) genes. All samples showed mutant genotypes in both genes with a prevalence > 90% for the 58R, 117N, 382C, and 383G. A new mutation (116G) in pvdhfr was found at a frequency of 3.3%. Six different pvdhfr/dhps multilocus genotypes were observed with the predominance of the quintuple mutant-type 58R/117N/173L-382C/383G (59.3%). No significant differences were observed between the prevalence of haplotypes and the year of collection. Our results indicate that, in this area, the fixation of SP drug-resistant parasites in the P. vivax population is stable.
authors: University Lyon 1, Malaria Research Unit, Lyon, France.
authors: Céline
authors: C
authors: Barnadas
authors: Lise
authors: L
authors: Musset
authors: Eric
authors: E
authors: Legrand
authors: Magali
authors: M
authors: Tichit
authors: Sébastien
authors: S
authors: Briolant
authors: Thierry
authors: T
authors: Fusai
authors: Christophe
authors: C
authors: Rogier
authors: Christiane
authors: C
authors: Bouchier
authors: Stéphane
authors: S
authors: Picot
authors: Didier
authors: D
authors: Ménard
mesh_terms: D000818:Animals; D000962:Antimalarials / Q000494:pharmacology*; D004094:Dihydropteroate Synthase / Q000235:genetics*; D004338:Drug Combinations; D004351:Drug Resistance; D009154:Mutation; D010966:Plasmodium vivax / Q000187:drug effects* / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide; D011739:Pyrimethamine / Q000494:pharmacology*; D013413:Sulfadoxine / Q000494:pharmacology*; D013762:Tetrahydrofolate Dehydrogenase / Q000235:genetics*
chemical_list: D000962:Antimalarials; D004338:Drug Combinations; C001205:fanasil, pyrimethamine drug combination; D013413:Sulfadoxine; D013762:Tetrahydrofolate Dehydrogenase; D004094:Dihydropteroate Synthase; D011739:Pyrimethamine