Diagnosis of human toxoplasmosis by using the recombinant truncated surface antigen 1 of Toxoplasma gondii.
The goal of the present study is to develop an enzyme-linked immunosorbent assay (ELISA) using a truncated surface antigen 1 (SAG1) gene of Toxoplasma gondii for the diagnosis of human toxoplasmosis. The truncated SAG1 gene was highly expressed in Escherichia coli. An ELISA kit based on the purified recombinant truncated SAG1 (rtSAG1) was developed, which was used to detect antibodies against T. gondii in human sera. The results showed that the infection of T. gondii could be detected sensitively and specifically by this serologic method. The positive concordance between rtSAG1-ELISA and Western blot, the gold standard, was 93.9% (31/33). However, the positive concordance between the commercial available ELISA Kit 1 (Haitai, Zhuhai, China) and ELISA Kit 2 (DiaSorin ETI-TOXOK-M reverse Plus, Italy) with Western blot was 79.5% (31/39) and 91.2% (31/34), respectively. Comparatively, the positive concordance of ELISA Kit 1 and 2 with Western blot was lower than rtSAG1-ELISA, in particular, the ELISA Kit 1 (P < 0.01), which indicated that the rtSAG1 protein could be used as the diagnostic antigen for human toxoplasmosis.
Department of Parasitology, Southern Medical University, Guangzhou, People's Republic of China.
Kun
K
Wu
Xiao-Guang
XG
Chen
Hua
H
Li
Hui
H
Yan
Pei-Liang
PL
Yang
Zhao-Rong
ZR
Lun
Xing-Quan
XQ
Zhu
D000818:Animals; D000913:Antibodies, Protozoan / Q000097:blood*; D000953:Antigens, Protozoan / Q000235:genetics; D002681:China; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods; D004926:Escherichia coli / Q000235:genetics; D005260:Female; D015870:Gene Expression; D006801:Humans; D011247:Pregnancy; D015800:Protozoan Proteins / Q000235:genetics; D011817:Rabbits; D011994:Recombinant Proteins / Q000235:genetics; D012680:Sensitivity and Specificity; D014122:Toxoplasma / Q000737:chemistry* / Q000276:immunology*; D014123:Toxoplasmosis / Q000175:diagnosis*
D000913:Antibodies, Protozoan; D000953:Antigens, Protozoan; D015800:Protozoan Proteins; D011994:Recombinant Proteins; C047168:SAG1 antigen, Toxoplasma