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Updated: Jul 12, 2025

Genome Editing in Mammalian Cell Lines using CRISPR-Cas
Published on: April 11, 2019
Efficient Large DNA Fragment Knock-in by Long dsDNA with 3'-Overhangs Mediated CRISPR Knock-in (LOCK) in Mammalian
Wenjie Han1, Haojun Liang1, Jianqiang Bao2,3
1Hefei National Research Center for Physical Sciences at the Microscale, School of Chemistry and Materials Science, Department of Polymer Science and Engineering, Chinese Academy of Sciences Key Laboratory of Soft Matter Chemistry, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), University of Science and Technology of China, Hefei, Anhui, China.
Abstract:
An efficient and precise genome-editing approach is in high demand in any molecular biology or cell biology laboratory worldwide. However, despite a recent rapid progress in the toolbox tailored for precise genome-editing, including the base editors and prime editors, there is still a need for a cost-effective knock-in (KI) approach amenable for long donor DNA cargos with high efficiency. By harnessing the high-efficient double-strand break (DSB) repair pathway of microhomology-mediated end joining, we previously showed that a specially designed 3'-overhang double-strand DNA (odsDNA) donor harboring 50-nt homology arm (HA) allows high-efficient exogenous DNA KI when combined with CRISPR-Cas9 technology. The lengths of the 3'-overhangs of odsDNA donors could be manipulated by the five consecutive phosphorothioate (PT) modifications. In this protocol, we detail the stepwise procedures to conduct the LOCK (Long dsDNA with 3'-Overhangs mediated CRISPR Knock-in) method for gene-sized (~1-3 kb) KI in mammalian cells.
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