Base editor plasmids were constructed by replacing deaminase and Cas-protein domains of the p2T-CMV-ABE7.10-BlastR (Addgene 152989) plasmid by USER cloning (New England Biolabs)(50 (link)). Individual sgRNAs were cloned into the SpCas9-hairpin U6 sgRNA expression plasmid (Addgene 71485) using BbsI plasmid digest and Gibson assembly (New England Biolabs). Protospacer sequences and gene-specific primers used for amplification followed by HTS are listed in Supplementary Table 1 . Constructs were transformed into Mach1 chemically competent E. coli (ThermoFisher) grown on LB agar plates and liquid cultures were grown in LB broth overnight at 37 °C with 100 μg/mL ampicillin. Individual colonies were validated by Templiphi rolling circle amplification (ThermoFisher) followed by Sanger sequencing. Verified plasmids were prepared by mini, midi, or maxiprep (Qiagen).
AAV vectors were cloned by Gibson assembly (NEB) using NEB Stable Competent E. coli (High Efficiency) to insert the sgRNA sequence and C-terminal base editor half of ABE8e-SpyMac into v5 Cbh-AAV-ABE-NpuC+U6-sgRNA (Addgene 137177), and the N-terminal base editor half and a second U6-sgRNA cassette into v5 Cbh-AAV-ABE-NpuN (Addgene 137178)(74 (link)).
AAV vectors were cloned by Gibson assembly (NEB) using NEB Stable Competent E. coli (High Efficiency) to insert the sgRNA sequence and C-terminal base editor half of ABE8e-SpyMac into v5 Cbh-AAV-ABE-NpuC+U6-sgRNA (Addgene 137177), and the N-terminal base editor half and a second U6-sgRNA cassette into v5 Cbh-AAV-ABE-NpuN (Addgene 137178)(74 (link)).