OBJECTIVE: To investigate the distribution and patterns of pfcrt and pfmdr1 polymorphisms in Plasmodium falciparum (P. falciparum) isolates collected from the malaria endemic area of Thailand along Thai-Myanmar border. METHODS: Dried blood spot samples were collected from 172 falciparum malaria patients prior received treatment. The samples were extracted using chelex to obtain parasite DNA. PCR-RFLP was employed to detect pfcrt mutation at codons 76, 220, 271, 326, 356 and 371, and the pfmdr1 mutation at codon 86. Pfmdr1 gene copy number was determined by SYBR Green I real-time PCR. RESULTS: Mutant alleles of pfcrt and wild type allele of pfmdr1 were found in almost all samples. Pfmdr1 gene copy number in isolates collected from all areas ranged from 1.0 to 5.0 copies and proportion of isolates carrying>1 gene copies was 38.1%. The distribution and patterns of pfcrt and pfmdr1 mutations were similar in P. falciparum isolates from all areas. However, significant differences in both number of pfmdr1 copies and prevalence of isolates carrying>1 gene copies were observed among isolates collected from different areas. The median pfmdr1 copy number in P. falciparum collected from Kanchanaburi and Mae Hongson were 2.5 and 2.0, respectively and more than half of the isolates carried>1 gene copies. CONCLUSIONS: The observation of pfmdr1 wild type and increasing of gene copy number may suggest declining of artesunate-mefloquine treatment efficacy in P. falciparum isolates in this border area.
OBJECTIVE: To investigate the distribution and patterns of pfcrt and pfmdr1 polymorphisms in Plasmodium falciparum (P. falciparum) isolates collected from the malaria endemic area of Thailand along Thai-Myanmar border. METHODS: Dried blood spot samples were collected from 172 falciparum malariapatients prior received treatment. The samples were extracted using chelex to obtain parasite DNA. PCR-RFLP was employed to detect pfcrt mutation at codons 76, 220, 271, 326, 356 and 371, and the pfmdr1 mutation at codon 86. Pfmdr1 gene copy number was determined by SYBR Green I real-time PCR. RESULTS: Mutant alleles of pfcrt and wild type allele of pfmdr1 were found in almost all samples. Pfmdr1 gene copy number in isolates collected from all areas ranged from 1.0 to 5.0 copies and proportion of isolates carrying>1 gene copies was 38.1%. The distribution and patterns of pfcrt and pfmdr1 mutations were similar in P. falciparum isolates from all areas. However, significant differences in both number of pfmdr1 copies and prevalence of isolates carrying>1 gene copies were observed among isolates collected from different areas. The median pfmdr1 copy number in P. falciparum collected from Kanchanaburi and Mae Hongson were 2.5 and 2.0, respectively and more than half of the isolates carried>1 gene copies. CONCLUSIONS: The observation of pfmdr1 wild type and increasing of gene copy number may suggest declining of artesunate-mefloquine treatment efficacy in P. falciparum isolates in this border area.
Authors: Sumiti Vinayak; Md Tauqeer Alam; Rithy Sem; Naman K Shah; Augustina I Susanti; Pharath Lim; Sinuon Muth; Jason D Maguire; William O Rogers; Thierry Fandeur; John W Barnwell; Ananias A Escalante; Chansuda Wongsrichanalai; Frederick Ariey; Steven R Meshnick; Venkatachalam Udhayakumar Journal: J Infect Dis Date: 2010-05-15 Impact factor: 5.226
Authors: Fredrick L Eyase; Hoseah M Akala; Luiser Ingasia; Agnes Cheruiyot; Angela Omondi; Charles Okudo; Dennis Juma; Redemptah Yeda; Ben Andagalu; Elizabeth Wanja; Edwin Kamau; David Schnabel; Wallace Bulimo; Norman C Waters; Douglas S Walsh; Jacob D Johnson Journal: PLoS One Date: 2013-05-13 Impact factor: 3.240
Authors: Patrick Reteng; Visia Vrisca; Inka Sukarno; Ilham Habib Djarkoni; Jane Angela Kalangi; George Eduardo Jacobs; Lucky Ronald Runtuwene; Yuki Eshita; Ryuichiro Maeda; Yutaka Suzuki; Arthur Elia Mongan; Sarah Maria Warouw; Junya Yamagishi; Josef Tuda Journal: BMC Res Notes Date: 2017-04-04