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Highly Efficient and Rapid Detection of the Cleavage Activity of Cas9/gRNA via a Fluorescent Reporter.
Applied Biochemistry and Biotechnology 2016 October
The RNA-guided endonuclease clustered regularly interspaced short palindromic repeats (CRISPR)-associated protein 9 (Cas9) derived from CRISPR systems is a simple and efficient genome-editing technology applied to various cell types and organisms. So far, the extensive approach to detect the cleavage activity of customized Cas9/guide RNA (gRNA) is T7 endonuclease I (T7EI) assay, which is time and labor consuming. In this study, we developed a visualized fluorescent reporter system to detect the specificity and cleavage activity of gRNA. Two gRNAs were designed to target porcine immunoglobulin M and nephrosis 1 genes. The cleavage activity was measured by using the traditional homology-directed repair (HDR)-based fluorescent reporter and the single-strand annealing (SSA)-based fluorescent reporter we established in this study. Compared with the HDR assay, the SSA-based fluorescent reporter approach was a more efficient and dependable strategy for testing the cleavage activity of Cas9/gRNA, thereby providing a universal and efficient approach for the application of CRISPR/Cas9 in generating gene-modified cells and organisms.
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