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CS17-7. NS3 of bluetongue virus interferes with the innate antiviral response.

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Article
H

Vitour, D. ; Lara, E. ; Chauveau, E. ; Adam, M. ; Sailleau, Corinne ; Bréard, Emmanuel ; Zientara, Stéphan

CYTOKINE

UMR 1161 Virologie Anses-Inra-Enva, 23 avenue du Général de Gaulle 94704 Maisons-previous termAlfort, France

2011

Article

Bluetongue disease is a major animal health concern transmitted through the bites of Culicoides vectors. Bluetongue virus (BTV), the etiologic agent of the disease, is a dsRNA virus belonging to the genus Orbivirus, into the Reoviridae family. BTV infection triggers the production of type-I interferon (IFN-I) and genomic dsRNA is a strong IFN-I inducer. We recently showed that the RIG-I-like receptor pathway is involved in the innate immune response following BTV dsRNA transfection. Most of viruses have evolved versatile strategies to escape the IFN-I response but nothing is known on the ability of BTV to counteract the innate antiviral response. In this study, we demonstrated that BTV serotype 8 (BTV-8) can dampen the type-I interferon response and that the non structural protein 3 (NS3) is involved in this process. In order to identify viral components involved in this inhibition and to explore its possible link with viral pathogenesis, we performed a yeast-two hybrid screen using NS3 BTV-8 as bait and a human cDNA library as prey. We describe here the result of this screen and discuss its potential link to virulence strength. Amino acids sequences/residues essential for the dedicated interaction will be changed onto the corresponding gene segment in a reverse genetics system to assess whether innate response can be restored at the virus level.
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