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J. Virol., 06 1996, 4173-4178, Vol 70, No. 6
MI Gorziglia, MJ Kadan, S Yei, J Lim, GM Lee, R Luthra and BC Trapnell
A novel recombinant adenovirus vector, Av3nBg, was constructed with
deletions in adenovirus E1, E2a, and E3 regions and expressing a beta-
galactosidase reporter gene. Av3nBg can be propagated at a high titer in a
corresponding A549-derived cell line, AE1-2a, which contains the adenovirus
E1 and E2a region genes inducibly expressed from separate
glucocorticoid-responsive promoters. Av3nBg demonstrated gene transfer and
expression comparable to that of Av1nBg, a first-generation adenovirus
vector with deletions in E1 and E3. Several lines of evidence suggest that
this vector is significantly more attenuated than E1 and E3 deletion
vectors. Metabolic DNA labeling studies showed no detectable de novo vector
DNA synthesis or accumulation, and metabolic protein labeling demonstrated
no detectable de novo hexon protein synthesis for Av3nBg in naive A549
cells even at a multiplicity of infection of up to 3,000 PFU per cell.
Additionally, naive A549 cells infected by Av3nBg did not accumulate
infectious virions. In contrast, both Av1nBg and Av2Lu vectors showed DNA
replication and hexon protein synthesis at multiplicities of infection of
500 PFU per cell. Av2Lu has a deletion in E1 and also carries a
temperature-sensitive mutation in E2a. Thus, molecular characterization has
demonstrated that the Av3nBg vector is improved with respect to the
potential for vector DNA replication and hexon protein expression compared
with both first- generation (Av1nBg) and second-generation (Av2Lu)
adenoviral vectors. These observations may have important implications for
potential use of adenovirus vectors in human gene therapy.
Copyright © 1996, American Society for Microbiology
Elimination of both E1 and E2 from adenovirus vectors further improves prospects for in vivo human gene therapy
Department of Virology, Genetic Therapy, Inc., Gaithersburg, Maryland 20878, USA.
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