Korean J Parasitol.  2014 Apr;52(2):143-149.

Probability of Antibody Formation against Circumsporozoite Protein of Plasmodium vivax among Korean Malaria Patients

Affiliations
  • 1Department of Parasitology, College of Medicine, The Catholic University of Korea, Seoul 137-701, Korea.
  • 2GenBody Inc., Cheonan 330-714, Korea.
  • 3Department of Tropical Medicine and Parasitology, Inha University School of Medicine, Incheon 400-712, Korea. tongsookim@inha.ac.kr

Abstract

To evaluate the seroprevalence against circumsporozoite protein (CSP) of Plasmodium vivax in sera of Korean patients, the central repeating domain (CRD) of CSP was cloned and analyzed. From the genomic DNA of patient's blood, 2 kinds of CSPs were identified to belong to a VK210 type, which is the dominant repeating of GDRA(D/A)GQPA, and named as PvCSPA and PvCSPB. Recombinantly expressed his-tagged PvCSPA or PvCSPB in Escherichia coli reacted well against sera of patients in western blot, with the detecting rate of 47.9% (58/121), which included 15 cases positive for PvCSPA, 6 cases positive for PvCSPB, and 37 cases for both. The mixture of PvCSPA and PvCSPB was loaded to a rapid diagnostic test kit (RDT) and applied with the same set of patient sera, which resulted in detection rates of 57.0% (69/121). When the protein sequences of PvCSPA were compared with those of P. vivax in endemic regions of India and Uganda, they were compatibly homologous to PvCSPA with minor mutations. These results suggested that the recombinant PvCSPA and PvCSPB loaded RDT may be a milestone in latent diagnosis which has been a hot issue of domestic malaria and important for radical therapy in overlapped infections with P. falciparum in tropical and subtropical areas. During the biological process of malarial infection, exposure of CSP to antigen-antibody reaction up to 57.0% is the first report in Korea.

Keyword

Plasmodium vivax; central repeating domain; circumsporozoite protein; variant VK210; rapid diagnostic test

MeSH Terms

Amino Acid Sequence
Antibodies, Protozoan/*blood/immunology
Antibody Formation
Antigens, Protozoan/immunology
Base Sequence
Humans
India
Malaria, Vivax/*diagnosis/*epidemiology/immunology
Merozoite Surface Protein 1/genetics/*immunology
Plasmodium vivax/genetics/immunology
Protozoan Proteins/genetics/*immunology
Reagent Kits, Diagnostic
Recombinant Proteins/diagnostic use/immunology
Republic of Korea/epidemiology
Sequence Analysis, DNA
Seroepidemiologic Studies
Uganda
Antibodies, Protozoan
Antigens, Protozoan
Merozoite Surface Protein 1
Protozoan Proteins
Reagent Kits, Diagnostic
Recombinant Proteins
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