Rapid generation of inducible mouse mutants

Area of Science:

• Genetics and Genomics
• Molecular Biology
• Developmental Biology

Background:

• Conditional gene targeting is crucial for studying gene function.
• Existing methods for generating inducible mouse mutants can be time-consuming.
• A need exists for accelerated and efficient systems for creating genetically modified mice.

Purpose of the Study:

• To develop and validate an optimized inducible recombination system for conditional gene targeting.
• To establish an efficient method for generating inducible mouse mutants.
• To reduce the time required for creating inducible mouse models.

Main Methods:

• Generation of a Cre recombinase-steroid receptor fusion protein for inducible recombination.
• Establishment of an ES cell line carrying the inducible recombinase and a floxed reporter gene.
• Production of completely ES cell-derived mice via tetraploid blastocyst complementation.

Main Results:

• The inducible recombination system demonstrated efficient Cre-mediated recombination in most mouse organs upon induction.
• No detectable background recombination activity was observed.
• Completely ES cell-derived mice were efficiently produced without requiring mouse breeding.
• The generation of inducible mouse mutants was accelerated to within 6 months.

Conclusions:

• The developed inducible recombination system offers a powerful and efficient tool for conditional gene targeting.
• Tetraploid blastocyst complementation provides a rapid route to generating genetically modified mice.
• This new strategy significantly shortens the timeline for creating inducible mouse models, facilitating faster research progress.