Attenuated influenza viruses

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/44 (2006.01) A61K 39/145 (2006.01) C12N 7/00 (2006.01) C12N 7/01 (2006.01) C12N 15/86 (2006.01)

Patent

CA 2327584

An attenuated influenza virus carrying a genomic nucleic acid segment which comprises 5' and 3' non-coding regions providing a mutated duplex region of an influenza virus RNA genomic segment operably-linked to a protein coding sequence for an influenza viral protein or a functional modification thereof, wherein said duplex region has at least one base-pair substitution such that expression of said protein-coding sequence in cells infected by said virus is reduced to give an attenuated phenotype. The attenuated influenza virus can be used in a vaccine.

L'invention concerne un virus atténué de la grippe portant un segment d'acide nucléique génomique qui comprend des régions 5' et 3' non codantes constituant une région double mutée d'un segment génomique d'ARN de virus de la grippe, liée de manière opérationnelle à une séquence codant pour une protéine d'une protéine virale de la grippe, ou une modification fonctionnelle de celui-ci. Ladite région double comporte au moins une substitution de paire de bases telle que l'expression de ladite séquence codant pour une protéine dans des cellules infectées par ledit virus est réduite de manière à former un phénotype atténué. Le virus atténué de la grippe peut être utilisé dans un vaccin.

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