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Published in: Malaria Journal 1/2018

Open Access 01-12-2018 | Research

Analysis of polymorphisms in the circumsporozoite protein gene of Plasmodium vivax isolates from Henan Province, China

Authors: Ying Liu, Rui-min Zhou, Ya-lan Zhang, Duo-quan Wang, Su-hua Li, Cheng-yun Yang, Dan Qian, Yu-ling Zhao, Hong-wei Zhang, Bian-li Xu

Published in: Malaria Journal | Issue 1/2018

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Abstract

Background

Plasmodium vivax malaria has historically been a major source of disease in Henan, China. In the 1970s, the morbidity of malaria was highest in the country. With support from the government and the efforts of healthcare personnel, the reported malaria cases have declined dramatically and a national elimination programme was launched in 2010. To achieve the goal, it is essential to study the diversity of autochthonous malaria and transmission of Plasmodium parasites, which will provide baseline data for disease control and management.

Methods

Thirty-two P. vivax isolates from Henan province were collected from 2008 to 2011, and circumsporozoite protein (csp) genes were analysed to estimate the genetic diversity of this parasite.

Results

The assessment of csp sequences indicated that all the isolates were the VK210 type, however, none of them was identical to the VK210 strain. The sequences displayed variations in the central region, and eight sub-types were observed. Among the sub-types, HN7 was the most prevalent (37.5%), followed by HN3 (34.4%). A total of 653 repeat units were discovered in 32 Henan isolates. Nucleotide sequences were grouped in 13 unique repeat nucleotide sequence allotypes that coded for 7 different repeated amino acid allotypes. B (GNGAGGQAA) and D (GDRAAGQPA) were more frequent based on the results; they represented 53.9% (352/653) of the total. In comparison to the basic repeat units of VK210, more than 75% of the central repeat units had at least one non-synonymous nucleotide change.

Conclusions

Recent P. vivax populations in Henan province showed some degree of genetic diversity in csp, with 8 sub-types among 32 samples. Meantime, the results also suggested its relative conserved parasite populations. This could provide interesting baseline data that allow identifying whether potential new cases differ from the parasites already circulating in the area.
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Metadata
Title
Analysis of polymorphisms in the circumsporozoite protein gene of Plasmodium vivax isolates from Henan Province, China
Authors
Ying Liu
Rui-min Zhou
Ya-lan Zhang
Duo-quan Wang
Su-hua Li
Cheng-yun Yang
Dan Qian
Yu-ling Zhao
Hong-wei Zhang
Bian-li Xu
Publication date
01-12-2018
Publisher
BioMed Central
Published in
Malaria Journal / Issue 1/2018
Electronic ISSN: 1475-2875
DOI
https://doi.org/10.1186/s12936-018-2237-1

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