Rapid, stable high-titre production of recombing retrovirus

Details Rapid, stable high-titre production of recombing retrovirus Rapid, stable high-titre production of recombing retrovirus

1995-04-28

1998-11-03

Ziska, Suzanne E.

Chemistry: molecular biology and microbiology

Treatment of micro-organisms or enzymes with electrical or...

Modification of viruses

4353201, 4352402, 514 44, 530350, C12N 1500, C12N 500, A61K 4800, C07K 1400

Patent

active

058307257

ABSTRACT:
High titre helper-free recombinant retrovirus are produced by (a) growing a transfected host cell, produced by transfecting a eukaryotic host cell with a recombinant vector capable of stable episomal maintenance in the host cell, in a medium under conditions whereby the recombinant vector is stably maintained as an episome in the transfected host cell and transcripts of said vector form, with retroviral gag, pol and env gene products, an infectious retrovirus; and (b) isolating from the medium helper-free infectious retrovirus formed in the transfected host cell. The recombinant vectors comprise (i) a retroviral construct comprising an exogenous gene; (ii) a eukaryotic origin of replication sequence providing a substrate for replicase activity capable of replicating the vector in the host cell; and, (iii) a copy control sequence providing a substrate for a copy control activity capable of maintaining the vector at a stable copy number in the host cell. The transfected host cell provides retroviral pol reverse transcriptase and integrase activity, the replicase activity and copy control activity, as well as retroviral gag and env gene products capable of forming, with a transcript of the retroviral construct, an infectious retrovirus.

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