Pam restriction-free adenine base editor fused protein and use thereof

Abstract

Disclosed are a PAM restriction-free adenine base editor fused protein and use. A mutant polypeptide is provided, which comprises an N-terminal fragment of SpRY(D10A), a TadA8e fragment, and a C-terminal fragment of SpRY(D10A) polypeptide in sequence from the N terminus to the C terminus. A fused protein including the mutant polypeptide can target the whole genome, thereby broadening the editable range of the genome. It can induce a base transition of A:T to G:C more efficiently, and has great use potential, including but not limited to, simulation or correction of pathogenic sites in genetic disorders. It lowers off-target at the transcriptome level, and is a mutant form with high efficiency and low off-target.

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