Attenuated equine herpesvirus

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/38 (2006.01) A61K 39/245 (2006.01) A61K 39/27 (2006.01) C07K 14/03 (2006.01) C12N 7/04 (2006.01)

Patent

CA 2337965

The present invention relates to novel Equine herpesvirus (EHV) mutants comprising one or more deletions, substitutions, or insertions in the endogenous promoter region of an essential viral gene, preferably the immediate early gene of EHV. The EHV mutants are stable and have reduced virulence, which makes them very suitable for use in a live vaccine. The invention furthermore relates to live vaccines comprising said EHV mutants, to DNA sequences and vectors harbouring a mutated EHV sequence, to host cells transfected with said DNA or vectors. The invention also relates to a method of attenuating EHV in general, and EHV-1 in particular.

L'invention concerne de nouveaux mutants de virus herpétiques équins (EHV) comprenant une ou plusieurs délétion(s), substitution(s), ou insertion(s) dans la région d'activation endogène d'un gène viral essentiel, de préférence dans le gène précoce immédiat du EHV. Ces mutants de EHV sont stables et présentent une virulence réduite et conviennent par conséquent très bien pour un vaccin vivant. L'invention concerne en outre des vaccins vivants comprenant ces mutants EHV, des séquences d'ADN et des vecteurs hébergeant une séquence EHV mutante, des cellules hôtes transfectées avec cet ADN ou ces vecteurs. L'invention concerne en outre un procédé permettant d'atténuer les EHV en général, et en particulier EHV-1. -

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