Site-specific DNA recombination in mammalian cells by the Cre recombinase of bacteriophage P1.
Journal: 1988/August - Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
PUBMED: 2839833
Abstract:
The Cre protein encoded by the coliphage P1 is a 38-kDa protein that efficiently promotes both intra- and intermolecular synapsis and recombination of DNA both in Escherichia coli and in vitro. Recombination occurs at a specific site, called lox, and does not require any other protein factors. The Cre protein is shown here also to be able to cause synapsis of DNA and site-specific recombination in a mammalian cell line. A stable mouse cell line was established that expresses the Cre protein under the control of the Cd2+-inducible metallothionein I gene promoter. DNA recombination was monitored with DNA substrates containing two directly repeated lox sites. One such substrate is a circular plasmid with two directly repeated lox sites (lox2) flanking a marker gene and was introduced into cells by Ca3(PO4)2 transformation. As a second substrate we used a pseudorabies virus (a herpesvirus) containing a lox2 insertion designed to provide a sensitive detection system for recombination. In both cases, site-specific recombination in vivo is dependent on the presence of the Cre protein and occurs specifically at the 34-base-pair lox sites. These results demonstrate the controlled site-specific synapsis of DNA and recombination by a prokaryotic protein in mammalian cells and suggest that Cre-mediated site-specific recombination may be a useful tool for understanding and modulating genome rearrangements in eukaryotes.
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Proc Natl Acad Sci U S A 85(14): 5166-5170

Site-specific DNA recombination in mammalian cells by the Cre recombinase of bacteriophage P1.

Abstract

The Cre protein encoded by the coliphage P1 is a 38-kDa protein that efficiently promotes both intra- and intermolecular synapsis and recombination of DNA both in Escherichia coli and in vitro. Recombination occurs at a specific site, called lox, and does not require any other protein factors. The Cre protein is shown here also to be able to cause synapsis of DNA and site-specific recombination in a mammalian cell line. A stable mouse cell line was established that expresses the Cre protein under the control of the Cd2+-inducible metallothionein I gene promoter. DNA recombination was monitored with DNA substrates containing two directly repeated lox sites. One such substrate is a circular plasmid with two directly repeated lox sites (lox2) flanking a marker gene and was introduced into cells by Ca3(PO4)2 transformation. As a second substrate we used a pseudorabies virus (a herpesvirus) containing a lox2 insertion designed to provide a sensitive detection system for recombination. In both cases, site-specific recombination in vivo is dependent on the presence of the Cre protein and occurs specifically at the 34-base-pair lox sites. These results demonstrate the controlled site-specific synapsis of DNA and recombination by a prokaryotic protein in mammalian cells and suggest that Cre-mediated site-specific recombination may be a useful tool for understanding and modulating genome rearrangements in eukaryotes.

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Selected References

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E. I. du Pont de Nemours and Company, Inc., Central Research and Development Department, Wilmington, DE 19898.
E. I. du Pont de Nemours and Company, Inc., Central Research and Development Department, Wilmington, DE 19898.
Abstract
The Cre protein encoded by the coliphage P1 is a 38-kDa protein that efficiently promotes both intra- and intermolecular synapsis and recombination of DNA both in Escherichia coli and in vitro. Recombination occurs at a specific site, called lox, and does not require any other protein factors. The Cre protein is shown here also to be able to cause synapsis of DNA and site-specific recombination in a mammalian cell line. A stable mouse cell line was established that expresses the Cre protein under the control of the Cd2+-inducible metallothionein I gene promoter. DNA recombination was monitored with DNA substrates containing two directly repeated lox sites. One such substrate is a circular plasmid with two directly repeated lox sites (lox2) flanking a marker gene and was introduced into cells by Ca3(PO4)2 transformation. As a second substrate we used a pseudorabies virus (a herpesvirus) containing a lox2 insertion designed to provide a sensitive detection system for recombination. In both cases, site-specific recombination in vivo is dependent on the presence of the Cre protein and occurs specifically at the 34-base-pair lox sites. These results demonstrate the controlled site-specific synapsis of DNA and recombination by a prokaryotic protein in mammalian cells and suggest that Cre-mediated site-specific recombination may be a useful tool for understanding and modulating genome rearrangements in eukaryotes.
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