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- W4313545728 abstract "Abstract Bacterial abortive-infection systems limit the spread of foreign invaders by shutting down or killing infected cells before the invaders can replicate 1,2 . Several RNA-targeting CRISPR–Cas systems (that is, types III and VI) cause abortive-infection phenotypes by activating indiscriminate nucleases 3–5 . However, a CRISPR-mediated abortive mechanism that leverages indiscriminate DNase activity of an RNA-guided single-effector nuclease has yet to be observed. Here we report that RNA targeting by the type V single-effector nuclease Cas12a2 drives abortive infection through non-specific cleavage of double-stranded DNA (dsDNA). After recognizing an RNA target with an activating protospacer-flanking sequence, Cas12a2 efficiently degrades single-stranded RNA (ssRNA), single-stranded DNA (ssDNA) and dsDNA. Within cells, the activation of Cas12a2 induces an SOS DNA-damage response and impairs growth, preventing the dissemination of the invader. Finally, we harnessed the collateral activity of Cas12a2 for direct RNA detection, demonstrating that Cas12a2 can be repurposed as an RNA-guided RNA-targeting tool. These findings expand the known defensive abilities of CRISPR–Cas systems and create additional opportunities for CRISPR technologies." @default.
- W4313545728 created "2023-01-06" @default.
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- W4313545728 date "2023-01-04" @default.
- W4313545728 modified "2023-10-18" @default.
- W4313545728 title "Cas12a2 elicits abortive infection through RNA-triggered destruction of dsDNA" @default.
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- W4313545728 doi "https://doi.org/10.1038/s41586-022-05559-3" @default.
- W4313545728 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36599979" @default.
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