Base editors for simultaneous introduction of C-to-T and A-to-G mutations.

Sakata, Rina C; Ishiguro, Soh; Mori, Hideto; Tanaka, Mamoru; Tatsuno, Kenji; Ueda, Hiroki; Yamamoto, Shogo; Seki, Motoaki et al. · Nat Biotechnol · 2020

basic_science · Level V

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Abstract

We describe base editors that combine both cytosine and adenine base-editing functions. A codon-optimized fusion of the cytosine deaminase PmCDA1, the adenosine deaminase TadA and a Cas9 nickase (Target-ACEmax) showed a high median simultaneous C-to-T and A-to-G editing activity at 47 genomic targets. On-target as well as DNA and RNA off-target activities of Target-ACEmax were similar to those of existing single-function base editors.

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