Genetic diversity of Plasmodium knowlesi among human and long-tailed macaque populations in Peninsular Malaysia: The utility of microsatellite markers

被引:8
|
作者
Huddin, Afiqah Saleh [1 ]
Yusuf, NoorAzian Md [1 ]
Abd Razak, Mohd Ridzuan Mohd [2 ]
Salim, Nurhainis Ogu [1 ]
Hisam, Shamilah [1 ]
机构
[1] Inst Med Res, Infect Dis Res Ctr, Parasitol Unit, Jalan Pahang, Kuala Lumpur 50588, Malaysia
[2] Herbal Med Res Ctr, Bioassay Unit, Jalan Pahang, Kuala Lumpur 50588, Malaysia
关键词
Malaria; Plasmodium knowlesi; Microsatellites; Genetic diversity; Allele distribution; Genetic differentiation; HUMAN INFECTIONS; MALARIA; FALCIPARUM; TRAVELER;
D O I
10.1016/j.meegid.2019.103952
中图分类号
R51 [传染病];
学科分类号
100401 ;
摘要
It has been discovered that Plasmodium knowlesi (P. knowlesi) is transmitted from macaque to man. Thus, the aim of the present study was to determine P. knowlesi genetic diversity in both human (n = 147) and long-tailed macaque (n = 26) samples from high- and low-endemicity localities. Genotyping was performed using seven neutral microsatellite loci markers. The size of the alleles, multiplicity of infection (MOI), mean number of alleles (Na), expected heterozygosity (H-E), linkage disequilibrium (LD), and genetic differentiation (F-ST) were determined. In highly endemic P. knowlesi localities, the MOI for human and long-tailed macaque isolates was 1.04 and 1.15, respectively, while the Na was 11.14 and 7.86, respectively. Based on the allele frequency distribution for all loci, and with F-ST < 0.1, no genetic differentiation was seen between human and long-tailed macaque. In localities characterised by lower P. knowlesi endemicity, the MOI for human and long-tailed macaque isolates was 1.05 and 1.11, respectively, while the Na was 6.14 and 2.71, respectively. Further molecular analysis of the allele frequencies indicated that there was a significant genetic differentiation in human P. knowlesi isolates as compared to long-tailed macaque isolates, with a very low fixation index (F-ST = 0.016, p < .05) based on multiple loci analysis. Our results further indicate that, in Peninsular Malaysia, humans are mostly affected by P. knowlesi of a single genotype, while long-tailed macaque tend to acquire polyclonal infections, which supports the assumption that there is a higher rate of transmission among long-tailed macaque. Understanding the genetic diversity of P. knowlesi isolates can provide invaluable information for characterising patterns of the population structure and the migration rate of P. knowlesi in peninsular Malaysia.
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页数:9
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