Screening and validation of genome-edited animals

Area of Science:

• Genetics
• Molecular Biology
• Animal Models

Background:

• Recent advancements in genome-editing technologies enable direct genetic modifications in embryos.
• These tools increase the ease, efficiency, and accessibility of creating novel alleles across species.

Purpose of the Study:

• To outline the challenges associated with genome editing in animal models.
• To present strategies for validating edited alleles.
• To discuss considerations for managing animal colonies with edited genomes.

Main Methods:

• Genome editing techniques applied directly to embryos.
• Modified allele screening in founder animals.
• Validation of edited alleles in subsequent generations (G1).

Main Results:

• Genome editing bypasses traditional selection cassettes, altering the validation timeline.
• Screening for intended alleles shifts to mosaic founder animals.
• Distinguishing desired alleles from unintended outcomes is crucial for confirmation.

Conclusions:

• Genome editing presents new temporal and technical challenges for allele validation.
• Robust validation strategies are essential to confirm desired genetic modifications.
• Effective animal colony management is necessary for research involving genome-edited animals.