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Updated: Aug 16, 2026

A Universal Protocol for Large-scale gRNA Library Production from any DNA Source
Published on: December 6, 2017
Protocol for iterative enrichment of integrated sgRNAs via derivative CRISPR-Cas9 libraries from genomic DNA of
Adriana Ordóñez1, David Ron2, Heather P Harding2
1Cambridge Institute for Medical Research (CIMR), University of Cambridge, Cambridge Biomedical Campus, The Keith Peters Building, Cambridge CB2 0XY, UK; Universidad Católica de Murcia (UCAM), UCAM HiTech, Campus de los Jerónimos 135, Guadalupe E-30107, Spain.
Abstract:
Here, we present a protocol for iterative enrichment of integrated single guide RNA (sgRNA) via derivative CRISPR-Cas9 from genomic DNA (gDNA) of phenotypically sorted fixed cells. We describe steps for high-scale lentiviral production, genome-wide screening, extracting gDNA from fixed cells, cloning of integrated sgRNAs, and high-scale transformation. This protocol introduces three key advantages: (1) applicability to fixed cells, (2) bypassing epigenetic drift, and (3) pause points lowering the contamination risk. We believe this approach will benefit researchers applying somatic cell genetics in cell biology. For complete details on the use and execution of this protocol, please refer to Ordoñez et al.1.
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