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Molecular markers associated with the increase of chloroquine resistance and disease severity in  Plasmodium vivax  are needed. The objective of this study was to evaluate the expression levels of  pvcrt-o  and  pvmdr-1  genes in a group of patients presenting CQRPv and patients who developed severe complications triggered exclusively by  P. vivax  infection. Two different sets of patients were included to this comprehensive study performed in the Brazilian Amazon: 1) patients with clinically characterized chloroquine-resistant  P. vivax  compared with patients with susceptible parasites from  in   vivo  studies and 2) patients with severe vivax malaria compared with patients without severity. Quantitative real-time PCR was performed to compare the transcript levels of two main transporters genes,  P. vivax  chloroquine resistance transporter ( pvcrt-o ) and the  P. vivax  multidrug resistance transporter ( pvmdr-1 ). Twelve chloroquine resistant cases and other 15 isolates from susceptible cases were included in the first set of patients. For the second set, seven patients with  P. vivax -attributed severe and 10 mild manifestations were included. Parasites from patients with chloroquine resistance presented up to 6.1 (95% CI: 3.8–14.3) and 2.4 (95% CI: 0.53–9.1) fold increase in  pvcrt-o  and  pvmdr-1  expression levels, respectively, compared to the susceptible group. Parasites from the severe vivax group had a 2.9 (95% CI: 1.1–8.3) and 4.9 (95% CI: 2.3–18.8) fold increase in  pvcrt-o  and  pvmdr-1  expression levels as compared to the control group with mild disease. These findings suggest that chloroquine resistance and clinical severity in  P. vivax  infections are strongly associated with increased expression levels of the  pvcrt-o  and  pvmdr-1  genes likely involved in chloroquine resistance.

plos one

Expression Levels of pvcrt-o and pvmdr-1 Are Associated with Chloroquine Resistance and Severe Plasmodium vivax Malaria in Patients of the Brazilian Amazon