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Journal of Virology, July 1999, p. 6141-6146, Vol. 73, No. 7
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Frequency and Stability of Chromosomal Integration of Adenovirus Vectors

Airi Harui,1 Shinobu Suzuki,1 Stefan Kochanek,2 and Kohnosuke Mitani1,3,*

Department of Microbiology, Immunology and Molecular Genetics, UCLA School of Medicine,1 and Jonsson Comprehensive Cancer Center,3 Los Angeles, California 90095-1747, and Center for Molecular Medicine (ZMMK), University of Cologne, 50931 Cologne, Germany2

Received 20 November 1998/Accepted 22 March 1999

One of the limitations of adenovirus vectors is the lack of machinery necessary for their integration into host chromosomes, resulting in short-term gene expression in dividing cells. We analyzed frequencies of integration and persistence of gene expression from integrated adenovirus vectors. Both E1-substituted and helper-dependent adenovirus vectors achieved similar integration efficiencies of ~10-3 to 10-5 per cell, with the helper-dependent vector showing slightly higher efficiencies. In stable cell pools, gene expression of the integrated vector persisted for at least 50 cell divisions without selection. However, some stable cell clones showed changes in gene expression, which were accompanied by structural changes in the integrated vector DNA.

* Corresponding author. Mailing address: Department of Microbiology, Immunology and Molecular Genetics, UCLA School of Medicine, Box 951747, Los Angeles, CA 90095-1747. Phone: (310) 267-2031. Fax: (310) 206-3865. E-mail: mitani{at}ucla.edu.

Journal of Virology, July 1999, p. 6141-6146, Vol. 73, No. 7
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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