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Methods Cell Biol
2019 Jan 01;151:305-321. doi: 10.1016/bs.mcb.2018.10.004.
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CRISPR/Cas9-mediated genome editing in sea urchins.
Lin CY
,
Oulhen N
,
Wessel G
,
Su YH
.
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The CRISPR (clustered regularly interspaced short palindromic repeat)/Cas9 (CRISPR-associated nuclease 9) technology enables rapid, targeted, and efficient changes in the genomes of various model organisms. The short guide RNAs (gRNAs) of the CRISPR/Cas9 system can be designed to recognize target DNA within coding regions for functional gene knockouts. Several studies have demonstrated that the CRISPR/Cas9 system efficiently and specifically targets sea urchin genes and results in expected mutant phenotypes. In addition to disrupting gene functions, modifications and additions to the Cas9 protein enable alternative activities targeted to specific sites within the genome. This includes a fusion of cytidine deaminase to Cas9 (Cas9-DA) for single nucleotide conversion in targeted sites. In this chapter, we describe detailed methods for the CRISPR/Cas9 application in sea urchin embryos, including gRNA design, in vitro synthesis of single guide RNA (sgRNA), and the usages of the CRISPR/Cas9 technology for gene knockout and single nucleotide editing. Methods for genotyping the resultant embryos are also provided for assessing efficiencies of gene editing.
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