Abstract:
:Cas9 is commonly introduced into cell lines to enable CRISPR-Cas9-mediated genome editing. Here, we studied the genetic and transcriptional consequences of Cas9 expression itself. Gene expression profiling of 165 pairs of human cancer cell lines and their Cas9-expressing derivatives revealed upregulation of the p53 pathway upon introduction of Cas9, specifically in wild-type TP53 (TP53-WT) cell lines. This was confirmed at the messenger RNA and protein levels. Moreover, elevated levels of DNA repair were observed in Cas9-expressing cell lines. Genetic characterization of 42 cell line pairs showed that introduction of Cas9 can lead to the emergence and expansion of p53-inactivating mutations. This was confirmed by competition experiments in isogenic TP53-WT and TP53-null (TP53-/-) cell lines. Lastly, Cas9 was less active in TP53-WT than in TP53-mutant cell lines, and Cas9-induced p53 pathway activation affected cellular sensitivity to both genetic and chemical perturbations. These findings may have broad implications for the proper use of CRISPR-Cas9-mediated genome editing.
journal_name
Nat Genetjournal_title
Nature geneticsauthors
Enache OM,Rendo V,Abdusamad M,Lam D,Davison D,Pal S,Currimjee N,Hess J,Pantel S,Nag A,Thorner AR,Doench JG,Vazquez F,Beroukhim R,Golub TR,Ben-David Udoi
10.1038/s41588-020-0623-4subject
Has Abstractpub_date
2020-07-01 00:00:00pages
662-668issue
7eissn
1061-4036issn
1546-1718pii
10.1038/s41588-020-0623-4journal_volume
52pub_type
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