Retroviral vectors having a reduced recombination rate

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/87 (2006.01) A61K 31/70 (2006.01) A61K 39/12 (2006.01) A61K 47/48 (2006.01) A61K 48/00 (2006.01) C12N 15/86 (2006.01) C12N 15/867 (2006.01)

Patent

CA 2158977

Retroviral vector constructs are described which have a 5' LTR, a tRNA binding site, a packaging signal, one or more heterologous sequences, an origin of second strand synthesis and a 3' LTR, wherein the vector construct lacks retroviral gag/pol or env coding sequences. In addition, gag/pol, and env expression cassettes are described wherein the expression cassettes lack a consecutive sequence of more than 8 nucleotides in common. The above-described retroviral vector constructs, gag/pol and env expression cassettes may be utilized to construct producer cell lines which preclude the formation of replication competent virus.

L'invention se rapporte à des vecteurs rétroviraux de synthèse comprenant une longue répétition terminale 5', un site de liaison d'ARNt, un signal d'encapsulation, une ou plusieurs séquences hétérologues, une origine de synthèse de second brin ainsi qu'une longue répétition terminale 3', ce vecteur de synthèse étant dépourvu de séquences de codage de gag/pol ou d'env rétrovirales. En outre, des cassettes d'expression de gag/pol et d'env sont décrites, ces cassettes étant exemptes de séquence consécutive commune de plus de 8 nucléotides. Les vecteurs de synthèse susmentionnés et les cassettes d'expression de gag/pol et d'env peuvent être utilisés pour construire des lignées cellulaires productrices qui préviennent la formation d'un virus apte à la réplication.

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