Korean J Parasitol.  2014 Dec;52(6):631-637. 10.3347/kjp.2014.52.6.631.

Plasmodium falciparum Genotype Diversity in Artemisinin Derivatives Treatment Failure Patients along the Thai-Myanmar Border

• Congpuong
• Hoonchaiyapoom T
• Inorn K

• KMID: 2069813
• DOI: http://doi.org/10.3347/kjp.2014.52.6.631

Abstract

Genetic characteristics of Plasmodium falciparum may play a role in the treatment outcome of malaria infection. We have studied the association between diversity at the merozoite surface protein-1 (msp-1), msp-2, and glutamate-rich protein (glurp) loci and the treatment outcome of uncomplicated falciparum malaria patients along the Thai-Myanmar border who were treated with artemisinin derivatives combination therapy. P. falciparum isolates were collected prior to treatment from 3 groups of patients; 50 cases of treatment failures, 50 recrudescences, and 56 successful treatments. Genotyping of the 3 polymorphic markers was analyzed by nested PCR. The distribution of msp-1 alleles was significantly different among the 3 groups of patients but not the msp-2 and glurp alleles. The allelic frequencies of K1 and MAD20 alleles of msp1 gene were higher while RO33 allele was significantly lower in the successful treatment group. Treatment failure samples had a higher median number of alleles as compared to the successful treatment group. Specific genotypes of msp-1, msp-2, and glurp were significantly associated with the treatment outcomes. Three allelic size variants were significantly higher among the isolates from the treatment failure groups, i.e., K1270-290, 3D7610-630, G650-690, while 2 variants, K1150-170, and 3D7670-690 were significantly lower. In conclusion, the present study reports the differences in multiplicity of infection and distribution of specific alleles of msp-1, msp-2, and glurp genes in P. falciparum isolates obtained from treatment failure and successful treatment patients following artemisinin derivatives combination therapy.

Keyword

Plasmodium falciparum; msp-1; msp-2; glurp; Thailand

MeSH Terms

Adult
Antigens, Protozoan/genetics
Antimalarials/*therapeutic use
Artemisinins/*therapeutic use
Female
Gene Frequency
*Genetic Variation
Genotype
Humans
Malaria, Falciparum/*drug therapy/*parasitology
Male
Merozoite Surface Protein 1/genetics
Myanmar
Plasmodium falciparum/*classification/*genetics/isolation & purification
Polymerase Chain Reaction
Protozoan Proteins/genetics
Thailand
Treatment Failure
Antigens, Protozoan
Antimalarials
Artemisinins
Merozoite Surface Protein 1
Protozoan Proteins