Genetic diversity of Plasmodium vivax in a hyper-endemic area predominated-by Plasmodium falciparum; A preliminary study

被引:0
|
作者
Dhangadamajhi, G. [1 ]
Rout, B. K. [2 ]
Kar, S. K. [1 ]
Ranjit, M. R. [1 ]
机构
[1] Reg Med Res Ctr ICMR, Bhubaneswar 751023, Orissa, India
[2] SUM Hosp, Bhubaneswar, Orissa, India
关键词
CIRCUMSPOROZOITE PROTEIN; VARIANTS VK210; VK247; POLYMORPHISM; INFECTIONS; MALARIA; MEXICO;
D O I
暂无
中图分类号
R38 [医学寄生虫学]; Q [生物科学];
学科分类号
07 ; 0710 ; 09 ; 100103 ;
摘要
Understanding the genetic diversity, extent and distribution of variant forms of Plasmodium vivax parasites is crucial in the development of effective control measures and in Orissa, a hyperendemic state in the eastern part of India, the polymorphic nature of P. vivax isolates is largely lacking. The result of the study analyzing two highly polymorphic single copy genes for P vivax circumsporozoite protein (pvcs) and P. vivax merozoite surface protein 3 alpha (pvmsp3 alpha) shows that the parasite population is highly heterogenous (33 distinct genotype from 35 isolates) in Orissa. However, the observation of the multiplicity of infection value of 1.34 and high frequency distribution of certain genotype with respect to individual marker (the VK247b allele with a frequency of 0.37; VK210e with 0.25 and VK210c with 0.14) suggests that the parasite population are likely to be under selective pressure and may either be due to preferential production of sporozoites carrying these variants in the available anopheline mosquito species of the state or selection of particular genotypes by host immune pressure. Moreover, although P vivax in South-East Asia indicates an overall predominance of VK210 which is thought to be the best adapted variant of pvcs repeat type, the almost equal prevalence of both repeat type of pvcs; VK210 and VK247 in the present study is unexpected and needs further study for clarification.
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页码:578 / 584
页数:7
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