Bicistronic influenza comprising two genes in tandem

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/86 (2006.01) A61K 39/145 (2006.01) A61K 48/00 (2006.01) C07K 14/11 (2006.01) C12N 7/04 (2006.01) A61K 39/00 (2006.01)

Patent

CA 2418333

The invention relates to recombinant influenza viruses for high-yield expression of incorporated foreign gene(s), which are genetically stable in the absence of any helper virus and which comprise at least one viral RNA segment being a tandem bicistronic RNA molecule coding for two genes in tandem, in said tandem bicistronic RNA molecule one of the standard viral genes being in covalent junction with a foreign, recombinant gene and having an upstream splice donor and a downstream splice acceptor signal surrounding the proximal coding region. The invention further provides a method for obtaining attenuated viruses which resist reassortment dependent progeny production in case of chance superinfections by wild-type influenza viruses; a method for the production of said recombinant influenza viruses; pharmaceutical compositions comprising said recombinant influenza viruses; and the use of said recombinant influenza viruses for preparing medicaments for vaccination purposes.

Cette invention a trait à des virus de recombinaison de la grippe, destinés à une expression à haut rendement d'un ou de plusieurs gènes incorporés, lesquels virus sont stables du point de vue génétique en l'absence de tout virus auxiliaire et renferment au moins un segment d'ARN viral, en l'occurrence une molécule d'ARN bicistronique tandem codant deux gènes en tandem. Dans cette molécule d'ARN bicistronique tandem, l'un des gènes viraux standards est en liaison covalente avec un gène étranger de recombinaison et possède un signal donneur d'épissures en amont ainsi qu'un signal accepteur d'épissures en aval, entourant la région proximale de codage. Cette invention porte également sur une technique permettant d'obtenir des virus atténués qui résistent à la production d'une descendance tributaire d'un réassortiment en cas de risque de surinfections par des virus de la grippe de type sauvage. Elle concerne, en outre, un procédé de production de ces virus de recombinaison ainsi que l'utilisation qui en est faite pour préparer des médicaments vaccinaux.

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