Efficiency of recombination by Cre transient expression in embryonic stem cells: comparison of various promoters

Journal of Biochemistry
Kimi ArakiKen-ichi Yamamura

Abstract

The Cre-loxP recombination system of bacteriophage P1 is frequently utilized in genetic manipulation in embryonic stem (ES) cells. The level of Cre expression is critical to induce loxP site-specific recombination in ES cells. To compare the efficiency of recombination, we constructed four Cre expression vectors driven by different promoters: cytomegarovirus/chicken beta-actin (CAG) promoter, human polypeptide chain elongation factor 1alpha (hEF-1alpha) promoter, mouse phosphoglycerate kinase-1 (mPGK) promoter, and polyoma enhancer/herpes simplex virus thymidine kinase (MC1) promoter. We introduced these Cre expression vectors by electroporation into three ES cell lines carrying a single copy of CAG-loxP-chloramphenicol acetyltransferase (CAT) gene-loxP-beta-galactosidase (beta-gal) gene construct. Since the Cre-mediated recombination leads to excision of the CAT gene, the efficiency of recombination can be monitored as beta-gal expression. No selection system was used in the experiments. The maximum recombination frequency was obtained when the CAG promoter was used, followed by the hEF-1alpha promoter, the mPGK promoter and the MC1 promoter in order. These results indicate that the efficiency of recombination in transient exp...Continue Reading

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