Characterization of an adenovirus gene transfer vector containing an E4 deletion

Human Gene Therapy
D ArmentanoA E Smith

Abstract

We describe the construction and characterization of an adenovirus type 2 vector, Ad2E4ORF6, which has been modified in the E4 region to contain only open reading frame 6. When assayed in cultured cells, Ad2E4ORF6 virus replication is slightly delayed but viral DNA synthesis, host-cell protein synthesis shut-off, and virus yield are indistinguishable from wild type. Late protein synthesis is normal with the exception of fiber synthesis, which is reduced approximately 10-fold. Despite the reduced fiber synthesis, Ad2E4ORF6 viral particles appear to contain a full complement of fiber protein. Virus replication in cotton rats indicates that Ad2E4ORF6 is replication defective in vivo. This may have safety implications for the development adenovirus vectors in that virus arising by recombination in the E1 region of an Ad2E4ORF6-based vector would be defective for growth in vivo. The deletion of E4 open reading frames that are not required for virus growth in vitro increases the cloning capacity of adenovirus vectors by 1.9 kb and may be generally useful for the construction of adenovirus vectors containing large cDNA inserts and/or regulatory elements. We describe the inclusion of the A2E4ORF6 modification in a recombinant adenoviru...Continue Reading

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