Journal
MOLECULAR THERAPY-NUCLEIC ACIDS
Volume 31, Issue -, Pages 78-87Publisher
CELL PRESS
DOI: 10.1016/j.omtn.2022.12.001
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We developed a new editor, SpRY-ABE8eF148A, which can mediate A-to-G and T-to-C transition mutations, suitable for repairing the most significant G & BULL;C-to-T & BULL;A pathogenic variants. Compared with SpRY-ABE8e, SpRY-ABE8eF148A narrows the editing range and enhances A-to-G editing efficiency in most sites with NR/YN PAMs. Furthermore, it significantly decreases the RNA off-target effect.
Adenine base editors (ABEs) can mediate two transition mutations, A-to-G and T-to-C, which are suitable for repairing G & BULL;C-to-T & BULL;A pathogenic variants, the most significant human pathogenic variant. By combining the protospacer adjacent motif (PAM)less SpRY nuclease with F148A-mutated TadA*8e deaminase, we developed a new editor, SpRY-ABE8eF148A, in this study, which has narrowed the editing range and enhanced A-to-G editing efficiency in most sites with NR/YN PAMs. Furthermore, compared with SpRY-ABE8e, SpRY-ABE8eF148A significantly decreased the RNA off-target effect. Therefore, this engineered base editor, SpRY-ABE8eF148A, expanded the editing scope and improved the editing precision for G & BULL;C-to-T & BULL;A pathogenic variants. Besides, we established a bioinformatics tool, adenine base-repairing sgRNA database of pathogenic variant (ARDPM), to facilitate the development of precise editors.
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