Base editing with a Cpf1-cytidine deaminase fusion
Li X., Wang Y., Liu Y., Yang B., Wang X., Wei J., Lu Z., Zhang Y., Wu J., Huang X., Yang L., Chen J.
The targeting range of CRISPR-Cas9 base editors (BEs) is limited by their G/C-rich protospacer-adjacent motif (PAM) sequences. To overcome this limitation, we developed a CRISPR-Cpf1-based BE by fusing the rat cytosine deaminase APOBEC1 to a catalytically inactive version of Lachnospiraceae bacterium Cpf1. The base editor recognizes a T-rich PAM sequence and catalyzes C-to-T conversion in human cells, while inducing low levels of indels, non-C-to-T substitutions and off-target editing.