Nucleic acid vaccines for prevention of flavivirus infection

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/40 (2006.01) A61K 39/12 (2006.01) A61K 48/00 (2006.01) C07K 14/18 (2006.01) C12N 7/00 (2006.01) C12N 15/85 (2006.01)

Patent

CA 2331368

The invention encompasses nucleic acid molecules containing transcription units which encode the flavivirus M and E protein antigens. The flaviviruses include Japanese encephalitis virus, dengue, yellow fever virus and St. Louis encephalitis virus. The nucleic acids function to provide the M and E protein antigens when the nucleic acid resides in an appropriate host cell, especially when the host cell is the cell of a subject. The invention also encompasses a vaccine whose active agent is the nucleic acid. The invention further encompasses the cultured host cells when they contain within them nucleic acid molecules containing the transcription units. The invention in addition encompasses a method of immunizing a subject against flavivirus infection by administering to the subject an effective amount of a vaccine containing a nucleic acid molecule containing the transcription unit of the invention.

L'invention concerne des molécules d'acides nucléiques incorporant des unités de transcription codant pour les antigènes des protéines M et E de flavivirus. Les flavivirus comprennent le virus de l'encéphalite japonaise, celui de la dengue, celui de la fièvre jaune et celui de l'encéphalite de Saint-Louis. Les acides nucléiques fonctionnent de manière à fournir les antigènes des protéines M et E, l'acide nucléique résidant dans une cellule hôte appropriée, notamment dans les cas où la cellule hôte est une cellule d'un sujet. L'invention englobe également un vaccin dont l'agent actif est l'acide nucléique, ainsi que des cellules hôtes de culture qui contiennent des molécules d'acides nucléiques renfermant les unités de transcription. L'invention concerne aussi un procédé d'immunisation d'un sujet contre l'infection par flavivirus. Le procédé consiste à administrer au sujet une quantité efficace d'un vaccin contenant une molécule d'acide nucléique qui renferme l'unité de transcription de la présente invention.

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