Genome-wide target specificity of CRISPR RNA-guided adenine base editors

Journal: Nature Biotechnology

Published: 2019-03-04

DOI: 10.1038/s41587-019-0050-1

Affiliations: 3

Authors: 5

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Research Highlight

DNA editor’s mistakes mapped

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© traffic_analyzer/Getty

Genome-editing tools known as adenine base editors (ABEs) have a much lower error rate than the much-touted CRISPR–Cas9 gene-editing method, and are thus considered safer for therapeutic applications. But ABEs still cause some unwanted changes to DNA, highlighting the need for technological improvements.

ABEs make a particular conversion between two of the four DNA letters — swapping an adenine for a guanine. Sometimes, however, they alter the genome in undesired ways.

To characterize the off-target activity of ABEs, researchers from the Institute for Basic Science in South Korea adapted a sequencing assay they had previously developed for calculating the accuracy of CRISPR–Cas9. They showed that ABEs make few mistakes — but when they do, the errors are different from those caused by other types of gene-editing tools.

The team concluded that more precision and specificity is needed before ABEs can be safely used to fix disease-causing mutations in people.

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  1. Nature Biotechnology 37, 430–435 (2019). doi: 10.1038/s41587-019-0050-1
Institutions Share
Center for Genome Engineering, IBS, South Korea 0.47
Department of Chemistry, SNU, South Korea 0.37
Department of Functional Genomics, UST, South Korea 0.17

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