Circular dna molecule having a conditional origin of...

C - Chemistry – Metallurgy – 12 – N

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C12N 1/20 (2006.01) C12N 15/64 (2006.01) C12N 15/69 (2006.01) C12N 15/70 (2006.01) C12N 15/74 (2006.01) C12Q 1/02 (2006.01) A61K 48/00 (2006.01)

Patent

CA 2501851

A prokaryotic recombinant host cell comprising a heterologous replication initiation protein that activates a conditional origin of replication and an extrachromosomal DNA molecule comprising a heterologous therapeutic gene and a conditional origin of replication whose functionality in the prokaryotic recombinant host cell requires a replication initiating protein which is foreign to the host cell is described. The host cell may comprise a pir gene having at least one mutation, which may occur in the pir gene copy number control region, the pir gene leucine zipper-like motif, or the pir gene DNA binding region.

L'invention concerne une cellule hôte recombinée procaryote comprenant une protéine d'initiation de la réplication hétérologue activant une origine de réplication conditionnelle ainsi qu'une molécule d'ADN extrachromosomique comprenant un gène thérapeutique hétérologue et une origine de réplication conditionnelle dont la fonctionnalité dans la cellule hôte recombinée procaryote nécessite une protéine d'initiation de la réplication étrangère à la cellule hôte. Cette cellule hôte peut comprendre un gène pir présentant au moins une mutation, laquelle peut se produire dans la région de contrôle du nombre de copies du gène pir, le motif de type glissière à leucine du gène pir, ou la région de liaison à l'ADN du gène pir.

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