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Exploring genetic polymorphisms among Plasmodium vivax isolates from the Thai-Myanmar borders using circumsporozoite protein (pvcsp) and ookinete surface protein (pvs25) encoding genes

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Abstract

Plasmodium vivax malaria cases remain high along the Thai-Myanmar and Thai-Cambodia borders. Plasmodium vivax circumsporozoite protein (pvcsp) and Plasmodium vivax ookinete surface protein (pvs25) genes are promising molecular markers of the genetic diversity of P. vivax. This study investigated the genetic diversity of pvcsp and pvs25 in P. vivax isolates collected from the Thai-Myanmar border. The DNA samples were amplified, and the genotypes were analyzed by PCR–RFLP and DNA sequencing. Pvcsp genotypes, VK210, VK247, and mixed types, were found in 203 (91.9%), 15 (6.8%), and 3 (1.3%) of the isolates, respectively. Twenty-four allelic variants were observed, of which a high prevalence of VK210E and VK247E were reported. Two pvcsp variants, VK210C and VK210M showed significantly higher parasite density (46,234 (1154–144,000) vs. 25,606 (1373–68,878), respectively). The genetic diversity of pvcsp along the Thai-Myanmar border during 2002–2015 showed dynamic changes with both positive and negative selection. The frequency and distribution of pvcsp pattern might be changed over time and might be other factors contributing to gene selection. Three amino acid substitutions of pvs25, i.e., E97Q, I130T, and Q131K, were investigated with frequencies of 10 (4.5%), 221 (100%), and 204 (92.3%) isolates, respectively. There was no association between parasite density and pvs25 polymorphisms. The frequency of pvs25 polymorphism was similar to that previously reported, with the absence of random mutation. In conclusion, the genetic variation of pvcsp was changed over times whereas the genetic diversity of pvs25 was limited; these variations would be helpful for further vaccine development against P. vivax malaria.

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Data availability

All relevant data is enclosed within the manuscript. The DNA sequences are available on request.

Abbreviations

EGF:

Epidermal growth factor

GPI:

Glycosyl phosphatidyl inositol

Hd :

Haplotype diversity

P. falciparum :

Plasmodium falciparum

P. vivax :

Plasmodium vivax

PCR:

Polymerase chain reaction

PCR-RFLP:

Polymerase chain reaction-restriction fragment length polymorphism

Pvcsp :

Plasmodium vivax circumsporozoite protein

Pvs25 :

Plasmodium vivax ookinete surface protein

TBV:

Transmission-blocking vaccines

WBC:

White blood cell count

WHO:

The World Health Organization

π:

Nucleotide diversity

References

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Acknowledgements

This study was supported by Chulabhorn International College of Medicine (CICM) of Thammasat University. We thank Dr. Kridsada Sirisabhabhorn for supporting DNA samples and the Drug Discovery and Development Center, Thammasat University, for supporting facilitators during the COVID-19 situation.

Funding

Kesara Na-Bangchang is supported by the National Research Council of Thailand under the Research Team Promotion grant (grant number NRCT 820/2563), Thailand Science Research and Fundamental Fund, and Thammasat University (Center of Excellence in Pharmacology and Molecular Biology of Malaria and Cholangiocarcinoma).

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Authors

Contributions

BAG was the principal investigator of the study and drafted the first version of the manuscript. KN and WC designed the study and revised the manuscript. All authors reviewed, provided intellectual inputs, and approved this manuscript.

Corresponding author

Correspondence to Wanna Chaijaroenkul.

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Ethics approval

Approval of the study protocol was obtained from the Ethics Committee for Research in Human Subjects, Ministry of Public Health of Thailand (Number 3/52–293).

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Not applicable.

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Not applicable.

Competing interests

The authors declare no competing interests.

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Section Editor: Tobili Sam-Yellowe

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Guled, B.A., Na-Bangchang, K. & Chaijaroenkul, W. Exploring genetic polymorphisms among Plasmodium vivax isolates from the Thai-Myanmar borders using circumsporozoite protein (pvcsp) and ookinete surface protein (pvs25) encoding genes. Parasitol Res 123, 91 (2024). https://doi.org/10.1007/s00436-023-08104-x

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  • DOI: https://doi.org/10.1007/s00436-023-08104-x

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