Recombinant rabies virus compositions

A - Human Necessities – 61 – K

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A61K 39/205 (2006.01)

Patent

CA 2573631

Recombinant rabies viruses in which the arginine residue of the glycoprotein (G) at amino acid position 333 is exchanged, renders these viruses nonpathogenic for immunocompetent mammals regardless of the route of infection. Some of these recombinant rabies viruses after several serial virus passages in newborn mice can become pathogenic for adult mice. The reversion to the pathogenic phenotype is associated with a thymidine to adenosine mutation (TôA) at position 639 of the G gene, which results in an asparagine to lysine exchange at position 194 of G. The codon at position 637-639 was changed by site directed mutagenesis to replace asparagine at position 194 by an amino acid that minimized the possibility for an AsnôLys exchange at amino acid position 194 of G and prevents reversion to a pathogenic form of the virus.

Selon l'invention, des virus rabiques recombinants, dans lesquels le résidu arginine de la glycoprotéine (G) situé à la position aminoacide 333 est échangé, deviennent non pathogènes pour des mammifères immunocompétents, indépendamment du vecteur d'infection. Certains de ces virus rabiques recombinants, après plusieurs passages viraux en série chez la souris néonate, peuvent devenir pathogènes pour la souris adulte. La réversion au phénotype pathogène est associée à une mutation de la thymidine à l'adénosine (T.fwdarw.A) à la position 639 du gène G, ce qui aboutit à un échange de l'asparagine à la lysine à la position 194 de G. Le codon situé à la position 637-639 a été changé par mutagenèse dirigée afin de remplacer l'asparagine à la position 194 par un acide aminé, ce qui réduit au minimum la possibilité d'un échange Asn.fwdarw.Lys à la position aminoacide 194 de G et empêche la réversion à une forme pathogène du virus.

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