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This research was funded by PROCINORTE Project 2023 (INIFAP-CENID-SAI SIGI 154626612) and the Spanish Ministry of Science and Innovation (grant reference PID2022-136312OB-I00 to F.R.).

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Cloning and Expression of a Truncated Form of the p72 Protein of the African Swine Fever Virus (ASFV) for Application in an Efficient Indirect ELISA System

Publicat a:Pathogens. 14 (6): 542- - 2025-05-29 14(6), DOI: 10.3390/pathogens14060542

Autors: Cuevas-Romero, Julieta Sandra; Zavala-Ocampo, Perla Lucero; Pina-Pedrero, Sonia; Ganges, Llilianne; Muñoz-Aguilera, Adriana; Garcia-Cambron, Jose Bryan; Rodriguez, Fernando; Ambagala, Aruna; Cerriteño-Sanchez, Jose Luis

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African swine fever (ASF) is a disease that affects both domestic and wild swine. It was recently reported in the Dominican Republic and Haiti (2021), representing a substantial risk to America. The goal of this study was to produce a truncated form of the ASF-p72 recombinant protein based on the ASF strain genotype II (Georgia 2017) as well as to develop and validate a sensitive and specific ASF indirect-ELISA (iELISA) for early detection of ASF. The truncated ASF-p72 recombinant protein was successfully expressed in E. coli BL21/DE3 cells using the pET-SUMO plasmid. Bioinformatics analysis showed 100% homology among the new isolates of ASFV from genotype II. The ASF-p72-truncated protein was used to develop an iELISA, which had a high sensitivity (88%) and strong specificity (97%); the concordance index kappa was K = 0.872, indicating nearly perfect agreement compared to the WOAH confirmatory immunoperoxidase test. The validation results utilizing the reference sera panel from the OIE-ASF Reference Laboratory show the excellent detection capabilities of ASF antibodies up to a 1:1000 serum dilution. The inter-assay coefficient of variation (CV 10.4%) and intra-assay CV (2.8%) data show that the assay is precise and reproducible. This biotechnology advancement can be used to conduct future epidemiological research for ASF surveillance in ASF-free American countries.

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