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Direct measurement of DNA repair is critical for the annotation of their clinical relevance and the discovery of drugs for cancer therapy. Here we reported a "repaired and activated" DNAzyme (RADzyme) by incorporating a single methyl lesion (O6 MeG, 3MeC, or 1MeA) at designated positions through systematic screening. We found that the catalytic activity of the RADzyme was remarkably suppressed and could be restored via enzyme-mediated DNA repair. Benefit from these findings, a fluorogenic RADzyme sensor was developed for the monitoring o