Serges Sabukunze,Haorong Gu,Lin Zhao,Honglin Jia,Huanping Guo

Front Vet Sci.2024 Jun 5:11:1423581.doi: 10.3389/fvets.2024.1423581. eCollection 2024.

Abstract

Toxoplasmosis is an important zoonotic disease caused by  Toxoplasma gondii  that can infect almost all warm-blooded animals worldwide, including humans. The high prevalence of  T. gondii  infection and its ability to cause serious harm to humans and animals, especially immunodeficient individuals, make it a key public health issue. Accurate diagnostic tools with high sensitivity are needed for controlling  T. gondii  infection. In the current study, we compared the performance of recombinant SAG2, GRA6, and GRA7 in ELISA for the serological diagnosis of  T. gondii  infection in cats. We further investigated the antigenicity of recombinant dense granule protein 3 (rGRA3), rGRA5, rGRA8, and rSRS29A expressed in a plant-based, cell-free expression system for detecting antibodies in  T. gondii -infected cats. In summary, our data suggest that GRA7 is more sensitive than the other two antigens for the serodiagnosis of  T. gondii  infection in cats, and GRA3 expressed in the cell-free system is also a priming antigen in serological tests for detecting  T. gondii  infection in cats.

Keywords: GRA3; GRA6; GRA7; SAG2; Toxoplasma gondii; cats; serodiagnosis.