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Molecular and Cellular Biology, June 2001, p. 3926-3934, Vol. 21, No. 12
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.12.3926-3934.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Site-Specific Genomic Integration in Mammalian Cells Mediated by Phage phi C31 Integrase

Bhaskar Thyagarajan, Eric C. Olivares, Roger P. Hollis, Daniel S. Ginsburg, and Michele P. Calos*

Department of Genetics, Stanford University School of Medicine, Stanford, California 94305-5120

Received 12 January 2001/Returned for modification 21 February 2001/Accepted 23 March 2001

We previously established that the phage phi C31 integrase, a site-specific recombinase, mediates efficient integration in the human cell environment at attB and attP phage attachment sites on extrachromosomal vectors. We show here that phage attP sites inserted at various locations in human and mouse chromosomes serve as efficient targets for precise site-specific integration. Moreover, we characterize native "pseudo" attP sites in the human and mouse genomes that also mediate efficient integrase-mediated integration. These sites have partial sequence identity to attP. Such sites form naturally occurring targets for integration. This phage integrase-mediated reaction represents an effective site-specific integration system for higher cells and may be of value in gene therapy and other chromosome engineering strategies.


* Corresponding author. Mailing address: Department of Genetics, Stanford University School of Medicine, Stanford, CA 94305-5120. Phone: (650) 723-5558. Fax: (650) 725-1534. E-mail: calos{at}stanford.edu.


Molecular and Cellular Biology, June 2001, p. 3926-3934, Vol. 21, No. 12
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.12.3926-3934.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.



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Copyright © 2001 by the American Society for Microbiology. All rights reserved.