Over 5000 base pairs were inserted into mammalian cells using a simplified end joining process

Researchers have shown that a site specific double strand break (DSB) generated both in the genome and the donor plasmid using the CRISPR-Cas9 system can be efficiently used to target ∼5 kb plasmids into mammalian genomes via nonhomologous end joining (NHEJ). They were able to achieve efficiencies of up to 0.17% in HEK293 cells and 0.45% in CHO cells. This technique holds promise for quick and efficient insertion of a large foreign DNA sequence into a predetermined genomic site in mammalian cells.

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