RT Journal Article SR Electronic T1 CRISPR/Cas9 screening using unique molecular identifiers JF bioRxiv FD Cold Spring Harbor Laboratory SP 114355 DO 10.1101/114355 A1 Bernhard Schmierer A1 Sandeep K. Botla A1 Jilin Zhang A1 Mikko Turunen A1 Teemu Kivioja A1 Jussi Taipale YR 2017 UL http://biorxiv.org/content/early/2017/05/15/114355.abstract AB Loss of function screening by CRISPR/Cas9 gene knockout with pooled, lentiviral guide libraries is a widely applicable method for systematic identification of genes contributing to diverse cellular phenotypes. Here, random sequence labels (RSLs) are incorporated into the guide library, which act as unique molecular identifiers (UMIs) to allow massively parallel lineage tracing and lineage dropout screening. RSLs greatly improve the reproducibility of results by increasing both the precision and the accuracy of screens. They reduce the number of cells and sequencing reads needed to reach a set statistical power, or allow a more robust screen using the same number of cells.