PT - JOURNAL ARTICLE AU - Skene, Peter J. AU - Henikoff, Steven TI - CUT&amp;RUN: Targeted <em>in situ</em> genome-wide profiling with high efficiency for low cell numbers AID - 10.1101/193219 DP - 2017 Jan 01 TA - bioRxiv PG - 193219 4099 - http://biorxiv.org/content/early/2017/09/24/193219.short 4100 - http://biorxiv.org/content/early/2017/09/24/193219.full AB - Cleavage Under Targets and Release Using Nuclease (CUT&amp;RUN) is an epigenomic profiling strategy in which antibody-targeted controlled cleavage by micrococcal nuclease releases specific protein-DNA complexes into the supernatant for paired-end DNA sequencing. As only the targeted fragments enter into solution, and the vast majority of DNA is left behind, CUT&amp;RUN has exceptionally low background levels. CUT&amp;RUN outperforms the most widely-used Chromatin Immunoprecipitation (ChIP) protocols in resolution, signal-to-noise, and depth of sequencing required. In contrast to ChIP, CUT&amp;RUN is free of solubility and DNA accessibility artifacts and can be used to profile insoluble chromatin and to detect long-range 3D contacts without cross-linking. Here we present an improved CUT&amp;RUN protocol that does not require isolation of nuclei and provides high-quality data starting with only 100 cells for a histone modification and 1000 cells for a transcription factor. From cells to purified DNA CUT&amp;RUN requires less than a day at the lab bench.