Analysis of Polymorphisms in the Merozoite Surface Protein-3a Gene and Two Microsatellite Loci in Sri Lankan Plasmodium vivax: Evidence of Population Substructure in Sri Lanka

Mette L Schousboe, Rupika S Rajakaruna, Priyanie H Amerasinghe, Flemming Konradsen, Rosalynn Ord, Richard Pearce, Ib C Bygbjerg, Cally Roper, Michael Alifrangis

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Abstract

Abstract. The geographical distribution of genetic variation in Plasmodium vivax samples (N = 386) from nine districts across Sri Lanka is described using three markers; the P. vivax merozoite surface protein-3a (Pvmsp-3a) gene, and the two microsatellites m1501 and m3502. At Pvmsp-3a, 11 alleles were found with an expected heterozygosity (H(e)) of 0.81, whereas at m1501 and m3502, 24 alleles (H(e) = 0.85) and 8 alleles (H(e) = 0.74) were detected, respectively. Overall, 95 unique three locus genotypes were detected among the 279 samples positive at all three loci (H(e) = 0.95). Calculating the pairwise fixation index (F(ST)) revealed statistically significant population structure. The presence of identical 2-loci microsatellite genotypes in a significant proportion of samples revealed local clusters of closely related isolates contributing to strong linkage disequilibrium between marker alleles. The results show evidence of high genetic diversity and possible population substructure of P. vivax populations in Sri Lanka.
OriginalsprogEngelsk
TidsskriftAmerican Journal of Tropical Medicine and Hygiene
Vol/bind85
Udgave nummer6
Sider (fra-til)994-1001
Antal sider8
ISSN0002-9637
DOI
StatusUdgivet - 1 dec. 2011

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