Engineering of high-precision base editors for site-specific single nucleotide replacement View Full Text


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Article Info

DATE

2019-12

AUTHORS

Junjie Tan, Fei Zhang, Daniel Karcher, Ralph Bock

ABSTRACT

RNA-guided nucleases of the CRISPR/Cas type can be repurposed as programmable nucleotide deaminases to mediate targeted nucleotide substitutions. Such base editors have enormous potential in genome editing, gene therapy and precision breeding. However, current editors suffer from limited specificity in that they edit different and/or multiple bases within a larger sequence window. Using cytidine deaminase base editors that elicit C-to-T mutations, we show here that high editing precision can be achieved by engineering the connection between the deaminase domain and the Cas domain of the editor. By systematically testing different linker sequences and removing non-essential sequences from the deaminase, we obtain high-precision base editors with narrow activity windows that can selectively edit a single cytidine at a specific position with high accuracy and efficiency. These base editors will enable the use of genome editing in applications where single-nucleotide changes are required and off-target editing of adjacent nucleotides is not tolerable. More... »

PAGES

439

References to SciGraph publications

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  • Identifiers

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    http://scigraph.springernature.com/pub.10.1038/s41467-018-08034-8

    DOI

    http://dx.doi.org/10.1038/s41467-018-08034-8

    DIMENSIONS

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    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/30683865


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