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Publication : Establishment of a tTA-dependent photoactivatable Cre recombinase knock-in mouse model for optogenetic genome engineering.

First Author  Takao T Year  2020
Journal  Biochem Biophys Res Commun Volume  526
Issue  1 Pages  213-217
PubMed ID  32204914 Mgi Jnum  J:291642
Mgi Id  MGI:6447125 Doi  10.1016/j.bbrc.2020.03.015
Citation  Takao T, et al. (2020) Establishment of a tTA-dependent photoactivatable Cre recombinase knock-in mouse model for optogenetic genome engineering. Biochem Biophys Res Commun 526(1):213-217
abstractText  The Cre-loxP recombination system is widely used to generate genetically modified mice for biomedical research. Recently, a highly efficient photoactivatable Cre (PA-Cre) based on reassembly of split Cre fragments has been established. This technology enables efficient DNA recombination that is activated upon blue light illumination with spatiotemporal precision. In this study, we generated a tTA-dependent photoactivatable Cre-loxP recombinase knock-in mouse model (TRE-PA-Cre mice) using a CRISPR/Cas9 system. These mice were crossed with ROSA26-tdTomato mice (Cre reporter mouse) to visualize DNA recombination as marked by tdTomato expression. We demonstrated that external noninvasive LED blue light illumination allows efficient DNA recombination in the liver of TRE-PA-Cre:ROSA26-tdTomato mice transfected with tTA expression vectors using hydrodynamic tail vein injection. The TRE-PA-Cre mouse established here promises to be useful for optogenetic genome engineering in a noninvasive, spatiotemporal, and cell-type specific manner in vivo.
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