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CRISPR-Cas9-mediated DNA editing relies on guide RNAs (gRNAs) that direct site-specific DNA cleavage by the Cas endonuclease. Because natural gRNA is susceptible to intracellular degradation, it is desirable to chemically protect it for efficient editing. Using 4′-thioribonucleoside 5′-triphosphates and T7 transcription, we have prepared 4′-thio-modified gRNAs that guide Cas9-mediated DNA cleavage. This approach is a simple way to obtain chemically modified RNA suitable for CRISPR-Cas9 DNA editing.

Graphical abstract: Cas9-mediated DNA cleavage guided by enzymatically prepared 4′-thio-modified RNA

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