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Efficient biallelic mutagenesis with Cre/loxP-mediated inter-chromosomal recombination.
Hiroko Koike1, Kyoji Horie, Hidehiro Fukuyama
1Department of Social and Environmental Medicine, Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan.
EMBO Reports
|April 20, 2002
Summary
This study introduces an efficient method for creating biallelic mutations in embryonic stem cells, overcoming challenges in mammalian gene function studies. The new system facilitates phenotype-driven research by enabling targeted disruption of both gene alleles.
Area of Science:
- Genetics
- Molecular Biology
- Mammalian Cell Biology
Background:
- Disrupting both alleles of a gene in mammalian cells is challenging due to the presence of two alleles per gene, making biallelic mutagenesis rare.
- Studying gene function in mammals often requires complete gene knockout, which is difficult to achieve efficiently.
Purpose of the Study:
- To develop an efficient method for biallelic mutagenesis in embryonic stem cells.
- To facilitate phenotype-driven gene function studies in mammalian systems.
Main Methods:
- Introduction of loxP sites near centromeric regions of chromosome 1 in embryonic stem cells.
- Insertion of a mutant neo gene for selection of biallelic mutants using high-dose G418.
- Induction of homologous chromosome recombination using Cre recombinase expression.
Main Results:
- Achieved efficient biallelic mutagenesis in embryonic stem cells.
- Demonstrated successful selection of biallelic mutants via G418 resistance.
- Showed that Cre-mediated recombination significantly increases the number of biallelic mutants.
Conclusions:
- The developed system enables efficient biallelic mutagenesis in mammalian embryonic stem cells.
- This method provides a powerful tool for phenotype-driven gene function analysis.
- Facilitates the study of essential genes and complex genetic interactions in mammals.