Homing guide RNAs that target Cas9 to their own loci generate diverse barcodes that can trace the lineage of cells.
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In this study, the scientists present an approach for engineering evolving DNA barcodes in living cells. A homing guide RNA (hgRNA) scaffold directs the Cas9–hgRNA complex to the DNA locus of the hgRNA itself. This integrated approach will have wide-ranging applications, such as in deep lineage tracing, cellular barcoding, molecular recording, dissecting cancer biology, and connectome mapping.