Abstract
Toxoplasma gondii is a zoonotic parasite that is very common in livestock. Meat products from livestock infected with T. gondii are one of the important transmission routes of toxoplasmosis. Rapid and reliable diagnosis is a prerequisite for the prevention and control of toxoplasmosis. Neospora caninum and T. gondii are similar in morphology and life history, and there are a large number of cross antigens between them, making clinical diagnosis of toxoplasmosis more difficult. In this study, immunoprecipitation-mass spectrometry (IP-MS) was used to screen for T. gondii–specific antigens, and the specific antigen was cloned and expressed in Escherichia coli. The specific antigen was then used to establish an indirect ELISA diagnostic method. A total of 241 specific antigens of T. gondii and 662 cross antigens between T. gondii and N. caninum were screened by IP-MS. Through bioinformatics analysis and homology comparison, seven proteins were selected for gene cloning and prokaryotic expression, and the most suitable antigen, TgGRA54, was selected to establish an indirect ELISA for T. gondii. Compared with the indirect immunofluorescent antibody test (IFAT), the positive coincidence rate of the ELISA based on rTgGRA54 was 100% (72/72) and the negative coincidence rate was 80.95% (17/21). The indirect ELISA method based on TgGRA54 recombinant protein was established to detect T. gondii antibodies in bovine sera, and the recombinant protein reacted well with T. gondii positive sera from sheep, mouse, and swine, indicating that the recombinant protein is a good diagnostic antigen for T. gondii.
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Data supporting the conclusions of this article are included within the article and its additional files.
Abbreviations
- GRAs :
-
dense granule proteins
- MICs :
-
micronemes
- DMEM :
-
Dulbecco’s modified Eagle’s medium
- HFF :
-
human foreskin fibroblast
- BSA :
-
bovine serum albumin
- DMSO :
-
dimethyl sulfoxide
- CRISPR/Cas9 :
-
clustered regularly interspaced short palindromic repeats/CRISPR associated protein 9
- KEGG :
-
Kyoto Encyclopedia of Genes and Genomes
- GO :
-
Gene Ontology
- IP-MS :
-
Immunoprecipitation-Mass Spectrometry
- WB :
-
western blot
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This work was supported by funds of the National Key Research and Development Program of China (2022YFD1800200) and the Beijing Municipal Natural Science Foundation (6212016).
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J-L conceived the project. Z-XF and H-FL performed the experiments and drafted the manuscript. JL, QL, and L-FW participated in the design of the study and helped to draft the manuscript. Z-PS, X-MW, Y-QP, and Z-FZ participated in the interpretation of the data. All authors read and approved the final manuscript.
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The experiments were performed in strict according to the recommendations of the Guide for the Care and Use of Laboratory Animals of the Ministry of Science and Technology of China. All experimental animal procedures and protocols were approved by the Institutional Animal Care and Use Committee of China Agricultural University.
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Additional file 1
Table S1. The primer sequence of gene cloning. Additional file 2: Figure S1. Expression of recombinant protein. Additional file 3: Figure S2. The result of immunoprecipitation-mass spectrometry analysis. (DOCX 3583 kb)
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Feng, Z., Ling, H., Zhu, Z. et al. Identification of specific antigens between Toxoplasma gondii and Neospora caninum and application of potential diagnostic antigen TgGRA54. Parasitol Res 122, 2557–2566 (2023). https://doi.org/10.1007/s00436-023-07955-8
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DOI: https://doi.org/10.1007/s00436-023-07955-8