Rapid Generation of Somatic Mouse Mosaics with Locus-Specific, Stably Integrated Transgenic Elements

Area of Science:

• Genetics
• Molecular Biology
• Developmental Biology

Background:

• Current in situ transgenesis methods (viruses, electroporation) for somatic transgenic mice lack control over genetic parameters.
• Precise control over copy number, zygosity, and locus specificity is crucial for accurate modeling.

Purpose of the Study:

• To establish a novel method for precise genetic engineering in somatic cells.
• To develop a versatile platform for generating somatic mosaic mouse models with defined genetic characteristics.

Main Methods:

• Development of Mosaic Analysis by Dual Recombinase-mediated Cassette Exchange (MADR).
• Creation of a toolkit including elements for combination labeling, inducible/reversible transgene manipulation, and VCre recombinase expression.
• Application of MADR for generating glioma models with mixed zygosity and personalized driver mutations.

Main Results:

• MADR enables stable labeling of mutant cells with transgenic elements at precisely defined chromosomal loci.
• Demonstrated successful transgenesis in human cells.
• Successfully created versatile glioma models, including those with mixed reporter-identified zygosity and personalized driver mutations.

Conclusions:

• MADR provides precise control over genetic elements in somatic cells, overcoming limitations of existing methods.
• The MADR platform is extensible to numerous existing mouse lines, facilitating the generation of somatic mosaic mice.
• This technology democratizes the creation of sophisticated somatic mosaic models for research.