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Research Project: Countermeasures to Control and Eradicate Foreign Animal Diseases of Swine

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Title: Evaluation in swine of a recombinant Georgia 2010 African Swine Fever Virus lacking the I8L Gene

item VUONO, ELIZABETH - University Of Mississippi
item RAMIREZ-MEDINA, ELIZABETH - University Of Connecticut
item RAI, AYUSHI - Oak Ridge Institute For Science And Education (ORISE)
item Pruitt, Sarah
item SILVA, EDIANE - University Of Kansas
item Espinoza, Nallely
item VELAZQUEZ-SALINAS, LAURO - University Of Kansas
item Zhu, James
item Borca, Manuel
item Gladue, Douglas

Submitted to: Viruses
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 12/20/2020
Publication Date: 12/29/2020
Citation: Vuono, E., Ramirez-Medina, E., Rai, A., Pruitt, S.E., Silva, E., Espinoza, N.N., Velazquez-Salinas, L., Zhu, J.J., Borca, M.V., Gladue, D.P. 2020. Evaluation in swine of a recombinant Georgia 2010 African Swine Fever Virus lacking the I8L Gene. Viruses.

Interpretive Summary: African swine fever virus (ASFV) causes a devastating disease in swine, called African swine fever (ASF), that is currently spreading across Europe and Asia. There is no available vaccine for ASF, and currently only experimental live attenuated vaccines are derived from deletions of individual genes in the ASFV genome. In this study we a delete a gene in ASFV, that that has never been deleted before and did not alter the pathogenesis of ASFV. We identified two cellular proteins that bind this gene giving insight into how ASFV interacts with cells.

Technical Abstract: The African swine fever (ASF) pandemic is currently affecting pigs throughout Eurasia, resulting in significant swine production losses. The causative agent, ASF virus (ASFV), is a large, structurally complex virus with a genome encoding more than 160 genes. The function of most of those genes remain unknown. Here we present the previously uncharacterized ASFV gene I8L, the first gene in the genome. Kinetic studies of virus RNA transcription demonstrated that the I8L gene is transcribed as a late virus protein. Essentiality of I8L to virus replication was evaluated by developing a recombinant ASFV lacking the gene (ASFV-G-'I8L). In primary swine macrophage cell cultures ASFV-G-'I8L showed similar replication kinetics as the parental highly virulent field isolate Georgia2007 (ASFV-G). Domestic pigs experimentally infected with ASFV-G-'I8L presented with a clinical disease undistinguishable from that caused by ASFV-G, demonstrating that MGF360-1L is not involved in virulence in swine, the natural host of ASFV.