Abstract:
:Base editors (BEs) are RNA-guided CRISPR-Cas-derived genome editing tools that induce single-nucleotide changes. The limitations of current BEs lie in their low precision (especially when multiple target nucleotides of the deaminase are present within the activity window) and their restriction to targets that are in proper distance from the PAM sequence. We have recently developed high-precision cytidine BEs by engineering CDA1 truncations and nCas9 fusions that predominantly edit nucleotide C-18 relative to the PAM sequence NGG. Here, by testing fusions with Cas9 variants that recognize alternative PAMs, we provide a series of high-precision BEs that greatly expand the versatility of base editing. In addition, we obtained BEs that selectively edit C-15 or C-16. We also show that our high-precision BEs can substantially reduce off-target effect. These improved base editing tools will be widely applicable in basic research, biotechnology and gene therapy.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Tan J,Zhang F,Karcher D,Bock Rdoi
10.1038/s41467-020-14465-zsubject
Has Abstractpub_date
2020-01-31 00:00:00pages
629issue
1issn
2041-1723pii
10.1038/s41467-020-14465-zjournal_volume
11pub_type
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