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Mammalian genomes contain active recombinase recognition sites
B Thyagarajan1, M J Guimarães, A C Groth
1Department of Genetics, Stanford University School of Medicine, Stanford, CA 9405-5120, USA.
Gene
|February 26, 2000
Summary
Scientists discovered novel pseudo-lox sites in human and mouse genomes that enable efficient Cre recombinase activity. These sites offer a promising tool for gene therapy and genetic engineering in mammalian cells.
Area of Science:
- Molecular Biology
- Genetics
- Biotechnology
Background:
- Microbial recombinases, like Cre from bacteriophage P1, perform efficient site-specific recombination at target sites (e.g., loxP).
- The native loxP site is generally absent in mammalian genomes, limiting the direct application of Cre recombinase for genetic engineering in these systems.
Purpose of the Study:
- To identify and characterize novel DNA sequences within mammalian genomes that can serve as functional targets for Cre-mediated recombination.
- To evaluate the efficiency of these pseudo-lox sites in supporting gene integration and excision in mammalian cells.
Main Methods:
- Bacterial assays were used to assess the recombination efficiency of divergent sequences compared to the native loxP site.
- Transient transfection assays in human cells were performed to validate the functionality of pseudo-lox sites for gene manipulation.
Main Results:
- Sequences divergent from loxP, found in human and mouse genomes, demonstrated Cre-mediated recombination efficiencies comparable to the native loxP site in bacterial systems.
- Pseudo-lox sites successfully supported Cre-mediated gene integration and excision in transient assays within human cells.
Conclusions:
- Mammalian genomes contain sequences that function as effective pseudo-lox sites for Cre recombinase.
- These pseudo-lox sites represent a valuable tool for site-specific gene insertion and genetic engineering applications in gene therapy and beyond.