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Functional analysis of the latency-related gene of bovine herpesvirus types 1 and 5
Carolina Silvestro1, Clinton Jones2,3, Ana Bratanich4
1Facultad de Ciencias Veterinarias, Cátedra de Virología, Universidad de Buenos Aires, Av Chorroarin 280, CABA Buenos Aires, Argentina.
Abstract:
Bovine herpesvirus type 1 and type 5 (BoHV-1 and BoHV-5) are two alphaherpesviruses that affect cattle with two different syndromes. While BoHV-1 mainly produces respiratory symptoms, BoHV-5 is highly neuropathogenic and responsible for meningoencephalitis in young cattle. The latency-related (LR) gene, which is not conserved between these two herpesviruses, is the only viral gene abundantly expressed in latently infected neurons. The antiapoptotic action of this gene has been demonstrated during acute infection and reactivation from latency and seems to be mainly mediated by a LR protein (ORF-2) which is truncated in amino acid 51 in the case of BoHV-5. In this work, we show that the BoHV-5 LR gene is less efficient at cell survival and apoptosis inhibition in transient as well as in established neuronal cell lines compared to its BoHV-1 homolog. We hypothesize that the BoHV-5 LR gene may have novel functions that are lacking in the BoHV-1 LR gene and that these differences may contribute to its enhanced neuropathogenesis.
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