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Trends in drug resistance codons in Plasmodium falciparum dihydrofolate reductase and dihydropteroate synthase genes in Kenyan parasites from 2008 to 2012
- 作者:Dennis W Juma (1)
Angela A Omondi (1) Luiser Ingasia (1) Benjamin Opot (1) Agnes Cheruiyot (1) Redemptah Yeda (1) Charles Okudo (1) Jelagat Cheruiyot (1) Peninnah Muiruri (1) Bidii Ngalah (1) Lorna J Chebon (1) Fredrick Eyase (1) Jacob Johnson (1) Wallace D Bulimo (1) Hoseah M Akala (1) Ben Andagalu (1) Edwin Kamau (1)
1. Global Emerging Infections Surveillance (GEIS) Program ; United States Army Medical Research Unit-Kenya (USAMRU-K) ; Kenya Medical Research Institute (KEMRI) - Walter Reed Project ; Kisumu and Nairobi ; Kenya
- 关键词:Malaria ; Plasmodium falciparum dihydrofolate reductase ; Plasmodium falciparum dihydropteroate synthase
- 刊名:Malaria Journal
- 出版年:2014
- 出版时间:December 2014
- 年:2014
- 卷:13
- 期:1
- 全文大小:439 KB
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- 刊物主题:Parasitology; Infectious Diseases; Tropical Medicine;
- 出版者:BioMed Central
- ISSN:1475-2875
文摘
Background Sulphadoxine-pyrimethamine (SP), an antifolate, was replaced by artemether-lumefantrine as the first-line malaria drug treatment in Kenya in 2004 due to the wide spread of resistance. However, SP still remains the recommended drug for intermittent preventive treatment in pregnant women and infants (IPTP/I) owing to its safety profile. This study assessed the prevalence of mutations in dihydrofolate reductase (Pfdhfr) and dihydropteroate synthase (Pfdhps) genes associated with SP resistance in samples collected in Kenya between 2008 and 2012. Methods Field isolates collected from Kisumu, Kisii, Kericho and Malindi district hospitals were assessed for genetic polymorphism at various loci within Pfdhfr and Pfdhps genes by sequencing. Results Among the Pfdhfr mutations, codons N51I, C59R, S108N showed highest prevalence in all the field sites at 95.5%, 84.1% and 98.6% respectively. Pfdhfr S108N prevalence was highest in Kisii at 100%. A temporal trend analysis showed steady prevalence of mutations over time except for codon Pfdhps 581 which showed an increase in mixed genotypes. Triple Pfdhfr N51I/C59R/S108N and double Pfdhps A437G/ K540E had high prevalence rates of 86.6% and 87.9% respectively. The Pfdhfr/Pfdhps quintuple, N51I/C59R/S108N/A437G/K540E mutant which has been shown to be the most clinically relevant marker for SP resistance was observed in 75.7% of the samples. Conclusion SP resistance is still persistently high in western Kenya, which is likely due to fixation of key mutations in the Pfdhfr and Pfdhps genes as well as drug pressure from other antifolate drugs being used for the treatment of malaria and other infections. In addition, there is emergence and increasing prevalence of new mutations in Kenyan parasite population. Since SP is used for IPTP/I, molecular surveillance and in vitro susceptibility assays must be sustained to provide information on the emergence and spread of SP resistance.
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