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Site- and time-specific gene targeting in the mouse
1Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP, Collège de France, BP 163 67404 Illkirch Cedex, C.U. de Strasbourg, France.
Methods (San Diego, Calif.)
|May 1, 2001
Summary
Researchers developed a tamoxifen-inducible Cre-ER(T) system in mice for precise gene editing. This conditional recombination system enables targeted somatic mutations for studying gene function and disease modeling.
Area of Science:
- Genetics
- Molecular Biology
- Developmental Biology
Background:
- Conditional gene targeting is crucial for studying gene function and creating disease models.
- Existing systems often lack precise spatiotemporal control over genetic modifications.
- The Cre/lox system is a powerful tool for site-specific recombination, but its applications can be limited by uncontrolled activity.
Purpose of the Study:
- To establish and validate a tamoxifen-inducible, conditional site-specific recombination system in mice.
- To enable the efficient and controlled introduction of somatic mutations in specific cell types.
- To facilitate the generation of animal models for human diseases with precise genetic alterations.
Main Methods:
- Development of a new tamoxifen-dependent Cre recombinase (Cre-ER(T)) by fusing Cre recombinase to a mutated human estrogen receptor ligand-binding domain.
- Generation of transgenic mice expressing Cre-ER(T) under a cytomegalovirus promoter.
- Administration of tamoxifen to induce Cre-mediated recombination in tissues and analysis of gene excision efficiency.
- Crossbreeding Cre-ER(T) mice with reporter mice (expressing beta-galactosidase) to analyze recombination kinetics at the cellular level in the epidermis.
Main Results:
- Tamoxifen administration induced efficient, site-specific gene excision in a Cre-ER(T)-dependent manner in transgenic mice.
- Excision efficiency varied by tissue, with the highest observed in the skin (approx. 40%).
- Cellular-level analysis in double transgenic mice showed that recombination occurred rapidly (within days) in essentially all epidermis cells expressing Cre-ER(T) after tamoxifen treatment.
Conclusions:
- The developed Cre-ER(T) system provides efficient tamoxifen-dependent, site-specific recombination.
- This system allows for the generation of site-specific somatic mutations in a spatiotemporally controlled manner.
- The conditional recombination system is valuable for analyzing gene function and creating disease models that are not amenable to conventional gene targeting.