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Genome-wide Target Specificity of CRISPR RNA-guided Adenine Base Editors

Genome-wide Target Specificity of CRISPR RNA-guided Adenine Base Editors

Daesik Kim, Da-Eun Kim, Gyeorae Lee, Sung-Ik Cho, Jin-Soo Kim

Nat Biotechnol. 2019 Apr;37(4):430-435.

PMID: 30833658

Abstract:

Adenine base editors1 enable efficient targeted adenine-to-guanine single nucleotide conversions to induce or correct point mutations in human cells, animals, and plants1-4. Here we present a modified version of Digenome-seq, an in vitro method for identifying CRISPR (clustered regularly interspaced short palindromic repeats)-induced double-strand breaks using whole-genome sequencing5-8, to assess genome-wide target specificity of adenine base editors. To produce double-strand breaks at sites containing inosines, the products of adenine deamination, we treat human genomic DNA with an adenine base editor 7.10 protein-guide RNA complex and either endonuclease V or a combination of human alkyladenine DNA glycosylase and endonuclease VIII in vitro. Digenome-seq detects adenine base editor off-target sites with a substitution frequency of 0.1% or more. We show that adenine base editor 7.10, the cytosine base editor BE3, and unmodified CRISPR-associated protein 9 (Cas9) often recognize different off-target sites, highlighting the need for independent assessments of their genome-wide specificities6. Using targeted sequencing, we also show that use of preassembled adenine base editor ribonucleoproteins, modified guide RNAs5,8-11, and Sniper/Cas9 (ref. 12) reduces adenine base editor off-target activity in human cells.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP73245-A	Adenine		73-24-5	Price

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