Polymorphism of the parasite lactate dehydrogenase gene from Plasmodium vivax Korean isolates

Malaria Journal

Research

Youngjoo Sohn¹  Yoon-Joong Kang²  Sang-Wook Lee³  Hyeong-Woo Lee³  Hyun-Il Shin⁴  Jung-Yeon Kim⁴  Won-Ja Lee⁴ 

[1] Department of Anatomy, College of Korean Medicine, Institute of Korean Medicine, Kyung Hee University, 130-701, Seoul, Republic of Korea;Department of Biomedical Science, Jungwon University, 367-805, Goesan Chungbuk, Republic of Korea;Department of Pathology, College of Medicine, University of Florida, 1275 Center Drive, J-566, Gainesville, USA;Division of Malaria and Parasitic Diseases, National Institute of Health, Korea Centers for Disease Control and Prevention, Osong, 363-951, Republic of Korea;

关键词: Malaria;    Rapid Diagnostic Test;    Vivax Malaria;    Malaria Patient;    Merozoite Surface Protein;   

DOI  :  10.1186/1475-2875-12-166

 received in 2012-11-15, accepted in 2013-05-17,  发布年份 2013

来源: Springer

【 摘 要 】

BackgroundAssaying for the parasitic lactate dehydrogenase (pLDH) is widely used as a rapid diagnostic test (RDT), but the efficacy of its serological effectiveness in diagnosis, that is antibody detection ability, is not known. The genetic variation of Korean isolates was analysed, and recombinant protein pLDH was evaluated as a serodiagnostic antigen for the detection of Plasmodium vivax malaria.MethodsGenomic DNA was purified, and the pLDH gene of P. vivax was amplified from blood samples from 20 patients. The samples came from five epidemic areas: Bucheon-si, Gimpo-si, and Paju-si of Gyeonggi Province, Gangwha-gun of Incheon metropolitan city, and Cheorwon-gun of Gangwon Province, South Korea, from 2010 to 2011. The antigenicity of the recombinant protein pLDH was tested by western blot and enzyme-linked immunosorbent assay (ELISA).ResultsSequence analysis of 20 Korean isolates of P. vivax showed that the open reading frame (ORF) of 951 nucleotides encoded a deduced protein of 316 amino acids (aa). This ORF showed 100% identity with the P. vivax Belem strain (DQ060151) and P. vivax Hainan strain (FJ527750), 89.6% homology with Plasmodium falciparum FCC1_HN (DQ825436), 90.2% homology with Plasmodium berghei (AY437808), 96.8% homology with Plasmodium knowlesi (JF958130), and 90.2% homology with Plasmodium reichenowi (AB122147). A single-nucleotide polymorphism (SNP) at nucleotide 456 (T to C) was also observed in the isolate from Bucheon, but it did not change in the amino acid sequence. The expressed recombinant protein had a molecular weight of approximately 32 kDa, as analysed by sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE) analysis. Of the 40 P. vivax patients, 34 (85.0%) were positive by ELISA.ConclusionsThe pLDH genes of 19 isolates of P. vivax were identical, except one for SNP at nucleotide 456. This observation indicates that this gene is relatively stable. Based on these results, the relationship between antibody production against pLDH and the pattern of disease onset should be investigated further before using pLDH for serodiagnosis.

【 授权许可】

Unknown   
© Shin et al.; licensee BioMed Central Ltd. 2013. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.