Abstract

PUENTES, R et al. Variability of UL49 in bovine herpesvirus type 1 (BoHV-1) from Uruguayan isolates. InVet [online]. 2012, vol.14, n.2, pp.163-171. ISSN 1668-3498.

Bovine herpesvirus type 1 (BoHV-1) is the etiological agent of Infectious Bovine Rhinotracheitis (IBR). Depending on the genotype, it produces a wide variety of clinical syndromes, such as conjunctivitis, abortion and balanoposthitis. Vaccination against BoHV-1 is a common practice, so in order to differentiate infected from vaccinated animals, many BoHV-1 proteins were studied to develop marked vaccines. VP22, the major tegument protein codified by UL49 gene, is a non essential protein for virus multiplication, but induces a relevant immune response in the host. Therefore the variability of the gene UL49 of three BoHV-1 Uruguayan isolates (Uy1999, Uy2002 and Uy2004), was analyzed. Recombinant VP22 was expressed in a prokaryotic system and was recognized by sera of BoHV-1 immunized rabbits by Western blot analysis. Uy1999 (BoHV-1.1), Uy2002 and Uy2004 (BoHV-1.2), have 93.8%, 95% and 88.2% nucleotide similarity to the international Los Angeles BoHV-1.1 reference strain. The phylogenetic analysis showed that Uy1999 is grouped with BoHV-1.1 strains, while Uy2002 and Uy2004 isolates are grouped distant from other BoHV-1.1. The use of VP22 deleted vaccines and a serological technique able to detect antibodies against it, is an excellent alternative to be used in bovine vaccination programmes.

Keywords : UL49; Variability; BoHV isolates; Uruguay.

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