Abstract
Genome editing technology commenced in 1996 with the discovery of the first zinc-finger nuclease. Application of Clustered Regularly Interspaced Short Palindromic Repeat (CRISPR) associated protein 9 (Cas9) technology to genome editing of mammalian cells allowed researchers to use genome editing more easily and cost-effectively. However, one of the technological problems that remains to be solved is "off-target effects", which are unexpected mutations in nontarget DNA. One significant improvement in genome editing technology has been achieved with molecular/protein engineering. The key to this engineering is a "switch" to control function. In this review, we discuss recent efforts to design novel "switching" systems for precise editing using genome editing tools.
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