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Genetic Polymorphisms in <i xmlns="">Plasmodium vivax</i> Dihydrofolate Reductase and Dihydropteroate Synthase in Isolates from the Philippines, Bangladesh, and Nepal

Genetic Polymorphisms in Plasmodium vivax Dihydrofolate Reductase and Dihydropteroate Synthase in Isolates from the Philippines, Bangladesh, and Nepal

Article information

Korean J Parasito. 2015;53(2):227-232
Publication date (electronic) : 2015 April 22
doi : https://doi.org/10.3347/kjp.2015.53.2.227
1Graduate Program in Bioclinical Sciences, Chulabhorn International College of Medicine, Thammasat University, Pathumthani, Thailand
2Graduate Program in Biomedical Sciences, Faculty of Allied Health Sciences, Thammasat University, Pathumthani, Thailand
3Malaria Research Program, College of Public Health Sciences, Chulalongkorn University, Bangkok, Thailand
4World Health Organization-Nepal/Epidemiology and Disease Control Division (EDCD), DoHS, Teku Kathmandu, Nepal
5Research Institute for Tropical Medicine (RITM), Department of Health (DOH), Muntinlupa, Metro Manila, The Philippines
6Institute of Specific Prophylaxis and Tropical Medicine, Medical University of Vienna, Vienna, Austria
7Center of Excellence in Pharmacology and Molecular Biology of Malaria and Cholangiocarcinoma, Thammasat University, Pathumthani, Thailand
*Corresponding author (kesaratmu@yahoo.com)
Received 2014 November 24; Revised 2015 February 27; Accepted 2015 January 25.

Abstract

Genetic polymorphisms of pvdhfr and pvdhps genes of Plasmodium vivax were investigated in 83 blood samples collected from patients in the Philippines, Bangladesh, and Nepal. The SNP-haplotypes of the pvdhfr gene at the amino acid positions 13, 33, 57, 58, 61, 117, and 173, and that of the pvdhps gene at the positions 383 and 553 were analyzed by nested PCR-RFLP. Results suggest diverse polymorphic patterns of pvdhfr alone as well as the combination patterns with pvdhps mutant alleles in P. vivax isolates collected from the 3 endemic countries in Asia. All samples carried mutant combination alleles of pvdhfr and pvdhps. The most prevalent combination alleles found in samples from the Philippines and Bangladesh were triple mutant pvdhfr combined with single mutant pvdhps allele and triple mutant pvdhfr combined with double wild-type pvdhps alleles, respectively. Those collected from Nepal were quadruple mutant pvdhfr combined with double wild-type pvdhps alleles. New alternative antifolate drugs which are effective against sulfadoxine-pyrimethamine (SP)-resistant P. vivax are required.

Plasmodium vivax, the causative agent of relapsing benign tertian malaria, constitutes the second most common cause of malaria in the world with more than 80 million clinical cases annually [1]. In Nepal, P. vivax is the predominant malaria species, with the prevalence rate of about 80% of the total malaria cases [2]. Drug resistance monitoring was initiated in 1978 where both in vivo and in vitro studies were conducted with primary focus on P. falciparum resistance in Jhapa and Banke districts [2]. Chloroquine-resistant P. falciparum was first reported in the country in 1984 and subsequently resistance was spread to other districts. In 1996-1997, sulfadoxine-pyrimethamine (SP) that replaced chloroquine lost its efficacy. In 2000, the late treatment failure rate of P. falciparum cases treated with SP was found to be 57% [2]. For Bangladesh and the Philippines, prevalence rates of P. vivax infection were relatively lower (13 and 25%, respectively) [3]. Chloroquine resistance was first detected in 1970 in the bordering districts of Bangladesh, i.e., Mymensingh district and Chaklapunji Tea Estate in Habigonj district. Subsequently, the prevalence rates (RII+RIII) were increased from 10% in 1979 to 45% in 1987, to 57% in 1992 [4]. The molecular targets of action of sulfadoxine and pyrimethamine are dihydropteroate synthase (dhps) and dihydrofolate reductase (dhfr) enzymes, respectively. SP-resistance is determined by specific point mutations in these 2 parasite genes that cause alterations of key amino acid residues in the active sites of these enzymes and thus reduction in the affinity of the enzyme for the drug [5,6].

In most Asian countries, P. vivax infections are rarely treated with SP, but P. vivax isolates are exposed to SP during treatment of P. falciparum with mixed infections with P. vivax [7-10]. This has caused a progressive selection of SP-resistant alleles in P. vivax isolates [11]. The prevalence of P. vivax dihydrofolate reductase (pvdhfr) and dihydropteroate synthase (pvdhps) mutations have been reported from several malaria endemic countries in Asia including Thailand [12,13], Indonesia [14], Nepal [15], India [16], Afghanistan [17], Iran [18], Papua New Guinea [19], Madagascar [20], and the Philippines [23]. For Nepal, previous reports on pvdhfr mutations were identified at S58R (68%, n=43) followed by S117N/T (54%, n=35) and F57L (11%, n=7). For the Philippines, 1 pattern of pvdhfr combination alleles were found, double (66.7%) mutant allele. The most prevalent pvdhfr and pvdhps combination alleles were double mutant pvdhfr 58R/117N alleles combined with single mutant pvdhps 383G allele (50.0%) and combined with single wild type pvdhps A383 allele (50.0%). In this study, the diversity of pvdhfr and pvdhps mutant alleles in P. vivax isolates collected during 2005-2011 from the Philippines, Bangladesh, and Nepal were investigated. The study is the first report of the polymorphic frequency and pattern of pvdhfr and pvdhps in Bangladesh and first report of the polymorphic frequency and pattern of pvdhps in Nepal.

A total of 83 blood samples with mono-infection of P. vivax were collected from patients attending healthcare facilities in the Philippines in 2005 (33 samples), Bangladesh in 2010 (31 samples), and Nepal in 2011 (19 samples). Approval of the study protocol was obtained from the Ethics Committees of Ministry of Public Health of the Philippines, Bangladesh, and Nepal. Finger-prick blood (200-300 μl) samples were collected onto a filter paper (Whatman No. 3). The dried filter paper samples were stored in the plastic zip bags until analysis. Giemsa-stained thin and thick blood smears were prepared for qualitative and quantitative examination of P. vivax parasitemia under a light microscope. Parasite genomic DNA was extracted from individual dried blood spots on the filter paper using a QIAamp DNA extraction mini-kit (QIAGEN, Valencia, California, USA) and stored at -20˚C until use.

The primers and amplification conditions used for genotyping of pvdhfr were according to that previously reported with modifications [15,21]. All primers and restriction enzymes were obtained from Fermentas (Waltham, Massachusetts, USA) and Biolabs (Ipswich, Massachusetts, USA), respectively. Pvdhfr-OF and pvdhfr-OR primers were used for amplification of the first reaction of pvdhfr. PCR cycling condition was as follow: denaturation at 95˚C for 5 min, followed by 30 cycles of 95˚C for 30 sec, 64˚C for 30 sec, 72˚C for 30 sec, and 72˚C for 5 min.

Amino acid codons 13, 33, 58, and 61

The amplification of point mutations at amino acid codons 13, 33, 58, and 61 was performed using pvdhfr-13F and pvdhfr-13R primers. The PCR cycling condition was as follows: denaturation at 95˚C for 5 min, followed by 25 cycles of 95˚C for 30 sec, 66˚C for 30 sec, 72˚C for 30 sec, and 72˚C for 5 min. The PCR products were digested with restriction enzymes Hae III, Cfr42I (Sac II), Alu I, and Tsp45 I to detect the point mutations I13L, P33L, S58R, and T61M, respectively, and thereafter separated on 3% agarose gel.

Amino acid codons 57 and 173

The amplification of point mutations at amino acid codons 57 and 173 was performed using pvdhfr-F57 and pvdhfr-NR primers. The PCR cycling condition was as follows: denaturation at 95˚C for 5 min, followed by 25 cycles of 95˚C for 30 sec, 66˚C for 30 sec, 72˚C for 30 sec, and 72˚C for 5 min. The PCR products were digested with restriction enzymes Xmn I and Eco130I (Sty I) to detect the point mutations F57I/L and I173L, respectively, and thereafter separated on 3% agarose gel.

Amino acid codons 57 and 117

The amplification of point mutations at amino acid codons 57 and 117 were performed using pvdhfr-OF and pvdhfr-NR primers. The PCR cycling condition was as follows: denaturation at 95˚C for 5 min, followed by 25 cycles of 95˚C for 30 sec, 66˚C for 30 sec, 72˚C for 30 sec, and 72˚C for 5 min. The PCR products were digested with restriction enzymes BsrG I, Pvu II, Bsr I, and BstN I to detect the point mutations F57I and S117T/N, respectively, and thereafter separated on 3% agarose gel.

The primers and amplification conditions used for genotyping of pvdhps were according to that previously reported with modifications [15,18,21]. All primers and restriction enzymes were obtained from Fermentas and Biolabs, respectively. The amplification for first reaction of pvdhps was used pvdhps-OF and pvdhps-OR primers. The PCR cycling condition was as follows: denaturation at 95˚C for 5 min, followed by 25 cycles of 95˚C for 1 min, 58˚C for 2 min, 72˚C for 2 min, and 72˚C for 5 min.

Amino acid codons 383 and 553

The amplification of point mutations at amino acid codons 383 and 553 were performed using pvdhps-NF and pvdhps-NR primers, and pvdhps-553OF and pvdhps-NR primers, respectively. The PCR cycling condition was as follows: denaturation at 95˚C for 5 min, followed by 25 cycles of 95˚C for 1 min, 50˚C for 2 min, 72˚C for 2 min, and 72˚C for 5 min. The PCR products were digested with restriction enzymes Msp I and Msc I to detect the point mutations at positions A383G and A553G, respectively, and separated on 3% agarose gel.

Statistical analysis was performed using the SPSS statistical package (version 11.5 SPSS Inc, Chicago, Illinois, USA). The chi-square test was used to determine the difference in prevalence rates of pvdhfr and pvdhps mutant allele (s) of each SNP in P. vivax isolates collected from the 3 countries in Asia. Statistical significance level was set at P=0.05.

The diversity of mutations in pvdhfr and pvdhps genes of 83 P. vivax isolates collected during 2005-2011 from the Philippines, Bangladesh, and Nepal were investigated in this study. Results from the present study suggest diverse polymorphic patterns of pvdhfr alone as well as the combination patterns with pvdhps mutant alleles in P. vivax isolates collected from the 3 endemic countries in Asia. The polymorphic patterns of pvdhfr and pvdhps genes were highly diverse (Table 1). For pvdhfr, the wild-type I13 and I173 alleles were detected in all samples from the Philippines, Bangladesh, and Nepal. Three mutant alleles, i.e., 58R, 61M, and 117N were observed in samples collected from the Philippines with frequencies ranging from 81.8 to 100%. Eight mutant alleles at 5 amino acid residues, i.e., 33L, 57L, 58R, 58SR, 61M, 117N, 117T, and 117NT were detected in samples from Bangladesh at varying frequencies (32.3-87.1%). Five mutant alleles at 4 amino acid residues, i.e., 33L, 58R, 61M, 117N, and 117NT were observed in samples collected from Nepal with frequencies ranging from 47.4-100%. Significant differences in frequencies of the 4 pvdhfr mutations (33L, 57L, 58R, and 117N) were observed in samples from the 3 Asian counties. For pvdhps, all samples collected from the 3 countries carried wild-type A383 allele. The mutation at 553G allele was found in all samples collected from the Philippines, but not in samples from Bangladesh and Nepal.

The frequencies and patterns of pvdhfr and pvdhps single nucleotide polymorphisms in 83 P. vivax isolates (bold letters indicate mutant amino acids)

In the previous study published in 2011 [15], double mutant pvdhfr allele was commonly detected in P. vivax isolates in Nepal, but the triple and quadruple pvdhfr mutant haplotypes which are associated with a high level of in vivo pyrimethamine resistance were not found. In this study, in addition to single (21.0%), double (31.6%), triple (10.6%), and quadruple (36.8%, 33L/58R/61M/117N) mutant alleles, pvdhfr mutant alleles were found in the 2011 Nepal isolates, and all isolates possessed the mutant 61M allele. No isolate carried any mutant allele of pvdhps, suggesting an increased level of pyrimethamine resistance, but not sulfadoxine in Nepal in 2011.

Only 1 pattern of pvdhfr allele, i.e., double (66.7%, 58R/117N) mutant allele and 2 patterns of pvdhps alleles (50% 383G and 50% A383), was previously reported in the isolates from the Philippines in 2002 [23]. In the current study, 2 patterns of pvdhfr combination alleles, i.e., triple (81.8%) and double (18.2%) mutant alleles were found in 2005, and all isolates possessed the mutant 58R and 117N/T alleles. The most prevalent pvdhfr and pvdhps combination alleles were triple mutant pvdhfr 58R/61M/117N allele combined with single mutant pvdhps 553G allele (78.8%) (Table 2), suggesting increased level of SP resistant P. vivax isolates in the Philippines.

Distribution of pvdhfr and pvdhps combination alleles in 83 P. vivax isolates included in the analyses (bold letters indicate mutant amino acids)

Three patterns of pvdhfr combination alleles were found in samples collected from Bangladesh, i.e., quadruple (32.3%), triple (54.8%, 58R/61M/117N), and double (12.9%) mutant alleles. No mutant pvdhps allele was detected, indicating that P. vivax isolates circulating in Bangladesh possessed high pyrimethamine resistance genotype, but not for the sulfadoxine in 2010.

The mutants pvdhfr 58R and 117N/T were shown to be the dominant alleles in Southeast Asia, i.e., Thailand [12,13,15,22], Vietnam and the Philippines [23], East Timor [24], Myanmar [25], and Indonesia [14]. The mutants pvdhps 383G and 553G alleles were observed at low frequencies in most geographic regions including East Timor [24], Korea [25], Iran [18,21], and Pakistan [17,21], with highest frequency in Thailand [17,21,27]. The diversity of mutations in pvdhfr and pvdhps suggest different intensity of selective pressure resulting from SP uses for treatment of P. falciparum in 3 countries in Asia. This drug should not therefore be used in these countries for treatment of P. vivax infection.

Acknowledgements

The study was supported by The Commission on Higher Education, Ministry of Education of Thailand, The National Research University Project of Thailand (NRU), Office of Higher Education Commission, Thammasat University (Center of Excellence in Pharmacology and Molecular Biology of Malaria and Cholangiocarcinoma), and The Royal Golden Jubilee PhD Programme, Thailand Research Fund - Thammasat University Joint Fund and Graduated Student Grant to P. Thongdee (Grant no. PHD/0365/2552).

Notes

We have no conflict of interest related to this work.

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Article information Continued

Table 1.

The frequencies and patterns of pvdhfr and pvdhps single nucleotide polymorphisms in 83 P. vivax isolates (bold letters indicate mutant amino acids)

Gene Amino acid position SNPs No. of isolates (%) Philippines (n = 33) No. of isolates (%) Bangladesh (n = 31) No. of isolates (%) Nepal (n = 19)
Pvdhfr 13 I (wild-type) 33 (100.0) 31 (100.0) 19 (100.0)
L (mutant) 0 (0.0) 0 (0.0) 0 (0.0)
33 P (wild-type) 33 (100.0) 19 (61.3) 6 (31.6)
L (mutant) 0 (0.0)a 12 (38.7) 13 (68.4)
57 F (wild-type) 33 (100.0) 21 (67.7) 19 (100.0)
I (mutant) 0 (0.0) 0 (0.0) 0 (0.0)
L (mutant) 0 (0.0) 10 (32.3)a 0 (0.0)
58 S (wild-type) 0 (0.0) 4 (12.9) 10 (52.6)
R (mutant) 33 (100.0) 26 (83.9) 9 (47.4)a
S/R (mutant) 0 (0.0) 1 (3.2) 0 (0.0)
61 T (wild-type) 6 (18.2) 5 (16.1) 0 (0.0)
M (mutant) 27 (81.8) 26 (83.9) 19 (100.0)
117 S (wild-type) 0 (0.0) 7 (22.6) 10 (52.6)
N (mutant) 32 (97.0)a 14 (45.2) 8 (42.1)
T (mutant) 1 (3.0) 8 (25.8) 0 (0.0)
N/T (mutant) 0 (0.0) 2 (6.4) 1 (5.3)
173 I (wild-type) 33 (100.0) 31 (100.0) 19 (100.0)
L (mutant) 0 (0.0) 0 (0.0) 0 (0.0)
Pvdhps 383 A (wild-type) 33 (100.0) 31 (100.0) 19 (100.0)
G (mutant) 0 (0.0) 0 (0.0) 0 (0.0)
553 A (wild-type) 0 (0.0) 31 (100.0) 19 (100.0)
G (mutant) 33 (100.0)a 0 (0.0) 0 (0.0)
a

Statistically significant difference from samples collected from the other 2 countries (P<0.01; chi-square test).

Table 2.

Distribution of pvdhfr and pvdhps combination alleles in 83 P. vivax isolates included in the analyses (bold letters indicate mutant amino acids)

Pvdhps
Pvdhfr
Philippines (33) Bangladesh (31) Nepal (19)
A383G A553G I13L P33L F57I/L S58R T61M S117T/N I173L
A G I P F R T N I 6 0 0
A G I P F R M N I 26 0 0
A G I P F R M T I 1 0 0
A A I P F S M S I 0 0 4
A A I P F S M N I 0 2 0
A A I P F R M S I 0 1 0
A A I P F R M T I 0 1 0
A A I P F R M N I 0 10 1
A A I P F R M S,N I 0 1 1
A A I P L R M S I 0 1 0
A A I P L R T T I 0 3 0
A A I L F S M S I 0 1 6
A A I L F R M N I 0 2 7
A A I L F R M T I 0 1 0
A A I L F R M S,N I 0 1 0
A A I L F S,R M T I 0 1 0
A A I L L S M S I 0 1 0
A A I L L R M S I 0 3 0
A A I L L R T T I 0 2 0
Total 33 31 19