Abstract
CRISPR Biology Prokaryotic CRISPR-Cas systems defend bacterial cells from phage and plasmid infection. Strecker et al. characterized a CRISPR-Cas system that functions beyond adaptive immunity (see the Perspective by Hou and Zhang). Type V-K CRISPR-Cas from cyanobacteria was associated with a Tn7-like transposon and a natural nuclease–deficient effector Cas12k. Cas12k directed the insertion of Tn7-like transposons into target sites via RNA-guided Tn7 transposition. This system was reprogrammed to efficiently and specifically insert DNA both in vitro and into the Escherichia coli genome. Science , this issue p. [48][1]; see also p. [25][2] [1]: /lookup/doi/10.1126/science.aax9181 [2]: /lookup/doi/10.1126/science.aay2056
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