Abstract

Back-splicing of eukaryotic exon(s) leads to the production of covalently closed circular RNAs (circRNAs). Generally, most circRNAs contain overlapping sequences to their cognate linear RNAs from the same gene loci, leading to difficulties in distinguishing them from each other. A recent study has shown that some circRNAs can be specifically depleted by using base editing systems to target their predominantly back-splice sites for circularization, suggesting an efficient approach for circRNA knockout (KO). Here, we describe the detailed protocol for applying base editors to disrupt back-splice sites of predominantly circularized exons for circRNA KO at the genomic DNA level.

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