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Chaijaroenkul, Wanna; Ward, Stephen A; Mungthin, Mathirut; Johnson, David; Owen, Andrew; Bray, Patrick G; Na-Bangchang, Kesara (2011)
Publisher: BioMed Central
Journal: Malaria Journal
Languages: English
Types: Article
Subjects: qx_135, wc_770, RC955-962, RC109-216, qw_45, Infectious and parasitic diseases, Arctic medicine. Tropical medicine, Research

Classified by OpenAIRE into

mesheuropmc: parasitic diseases

Abstract

Background

Plasmodium falciparum chloroquine resistance (CQR) transporter protein (PfCRT) is known to be the important key of CQR. Recent studies have definitively demonstrated a link between mutations in the gene pfcrt and resistance to chloroquine in P. falciparum. Although these mutations are predictive of chloroquine resistance, they are not quantitatively predictive of the degree of resistance.

Methods

In this study, a total of 95 recently adapted P. falciparum isolates from Thailand were included in the analysis. Parasites were characterized for their drug susceptibility phenotypes and genotypes with respect to pfcrt. From the original 95 isolates, 20 were selected for complete pfcrt sequence analysis.

Results

Almost all of the parasites characterized carried the previously reported mutations K76T, A220S, Q271E, N326S, I356T and R371I. On complete sequencing, isolates were identified with novel mutations at K76A and E198K. There was a suggestion that parasites carrying E198K were less resistant than those that did not. In addition, pfcrt and pfmdr1 gene expression were investigated by real-time PCR. No relationship between the expression level of either of these genes and response to drug was observed.

Conclusion

Data from the present study suggest that other genes must contribute to the degree of resistance once the resistance phenotype is established through mutations in pfcrt.

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