Cpf1 proteins excise CRISPR RNAs from mRNA transcripts in mammalian cells

Cpf1 is a CRISPR-effector protein with greater specificity than Streptococcus pyogenes Cas9 (SpCas9) in genome-editing applications. Here we show that Lachnospiraceae bacterium (Lb) and Acidaminococus sp. (As) Cpf1 orthologs have RNase activities that can excise multiple CRISPR RNAs (crRNAs) from a single Pol II-driven RNA transcript expressed in mammalian cells. This property simplifies modification of multiple genomic targets and can be used to increase the efficiency of Cpf1-mediated editing.

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