Publication: Genetic diversity among Plasmodium vivax isolates along the Thai–Myanmar border of Thailand
Issued Date
2016
Valid Date
2017-11-10
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eng
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Mahidol University
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BioMed Central
Bibliographic Citation
Malaria Journal. Vol.15, (2016), 75
Suggested Citation
Sarunya Maneerattanasak, Panita Gosi, Srivicha Krudsood, Jarinee Tongshoob, Lanteri, Charlotte A., Georges Snounou, Srisin Khusmith Genetic diversity among Plasmodium vivax isolates along the Thai–Myanmar border of Thailand. Malaria Journal. Vol.15, (2016), 75. doi:10.1186/s12936-016-1136-6 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/3103
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Title
Genetic diversity among Plasmodium vivax isolates along the Thai–Myanmar border of Thailand
Abstract
Background: Knowledge of the population genetics and transmission dynamics of Plasmodium vivax is crucial in
predicting the emergence of drug resistance, relapse pattern and novel parasite phenotypes, all of which are relevant
to the control of vivax infections. The aim of this study was to analyse changes in the genetic diversity of P. vivax genes
from field isolates collected at different times along the Thai–Myanmar border.
Methods: Two hundred and fifty-four P. vivax isolates collected during two periods 10 years apart along the Thai–
Myanmar border were analysed. The parasites were genotyped by nested-PCR and PCR–RFLP targeting selected
polymorphic loci of Pvmsp1, Pvmsp3α and Pvcsp genes.
Results: The total number of distinguishable allelic variants observed for Pvcsp, Pvmsp1, and Pvmsp3α was 17, 7
and 3, respectively. High genetic diversity was observed for Pvcsp (HE = 0.846) and Pvmsp1 (HE = 0.709). Of the 254
isolates, 4.3 and 14.6 % harboured mixed Pvmsp1 and Pvcsp genotypes with a mean multiplicity of infection (MOI) of
1.06 and 1.15, respectively. The overall frequency of multiple genotypes was 16.9 %. When the frequencies of allelic
variants of each gene during the two distinct periods were analysed, significant differences were noted for Pvmsp1
(P = 0.018) and the Pvcsp (P = 0.033) allelic variants.
Conclusion: Despite the low malaria transmission levels in Thailand, P. vivax population exhibit a relatively high
degree of genetic diversity along the Thai–Myanmar border of Thailand, in particular for Pvmsp1 and Pvcsp, with
indication of geographic and temporal variation in frequencies for some variants. These results are of relevance to
monitoring the emergence of drug resistance and to the elaboration of measures to control vivax malaria.