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Title: Genetic diversity of Plasmodium vivax in Kolkata, India.
Authors: Kim, Jung-Ryong
Mallika Imwong
มัลลิกา อิ่มวงศ์
Nandy, Amitabha
Kesinee Chotivanich
เกศินี โชติวานิช
Apichart Nontprasert
อภิชาต นนท์ประเสริฐ
Naowarat Tonomsing
Maji, Ardhendu
Addy, Manjulika
Day, Nick P.J.
White, Nicholas J.
Sasithon Pukrittayakamee
ศศิธร ผู้กฤตยาคามี
Mahidol University. Faculty of Tropical Medicine. Department of Clinical Tropical Medicine
Mallika Imwong
Keywords: Gene frequency;Genetic markers;Genotype;Merozoite surface protein 1;Phylogeny;Plasmodium vivax;Polymerase chain reaction;Polymorphism, genetic;Polymorphism, restriction fragment length;Open Access article
Issue Date: 14-Aug-2006
Citation: Kim JR, Imwong M, Nandy A, Chotivanich K, Nontprasert A, Tonomsing N, et al. Genetic diversity of Plasmodium vivax in Kolkata, India. Malar J. 2006 Aug 14;5:71.
Abstract: BACKGROUND: Plasmodium vivax malaria accounts for approximately 60% of malaria cases in Kolkata, India. There has been limited information on the genotypic polymorphism of P. vivax in this malaria endemic area. Three highly polymorphic and single copy genes were selected for a study of genetic diversity in Kolkata strains. METHODS: Blood from 151 patients with P. vivax infection diagnosed in Kolkata between April 2003 and September 2004 was genotyped at three polymorphic loci: the P. vivax circumsporozoite protein (pvcs), the merozoite surface protein 1 (pvmsp1) and the merozoite surface protein 3-alpha (pvmsp3-alpha). RESULTS: Analysis of these three genetic markers revealed that P. vivax populations in Kolkata are highly diverse. A large number of distinguishable alleles were found from three genetic markers: 11 for pvcs, 35 for pvmsp1 and 37 for pvmsp3-alpha. These were, in general, randomly distributed amongst the isolates. Among the 151 isolates, 142 unique genotypes were detected the commonest genotype at a frequency of less than 2% (3/151). The overall rate of mixed genotype infections was 10.6%. CONCLUSION: These results indicate that the P. vivax parasite population is highly diverse in Kolkata, despite the low level of transmission. The genotyping protocols used in this study may be useful for differentiating re-infection from relapse and recrudescence in studies assessing of malarial drug efficacy in vivax malaria.
ISSN: 1475-2875 (electronic)
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