CRISPR enriches for cells with mutations in a p53-related interactome, and this can be inhibited.
Jiang, L.; Ingelshed, K.; Shen, Y.; Boddul, S. V.; Iyer, V. S.; Kasza, Z.; Sedimbi, S.; Lane, D. P.; Wermeling, F.
Show abstract
CRISPR/Cas9 can be used to inactivate or modify genes by inducing double-stranded DNA breaks1-3. As a protective cellular response, DNA breaks result in p53-mediated cell cycle arrest and activation of cell death programs4,5. Inactivating p53 mutations are the most commonly found genetic alterations in cancer, highlighting the important role of the gene6-8. Here, we show that cells deficient in p53, as well as in genes of a core CRISPR-p53 tumor suppressor interactome, are enriched in a cell population when CRISPR is applied. Such enrichment could pose a challenge for clinical CRISPR use. Importantly, we identify that transient p53 inhibition suppresses the enrichment of cells with these mutations. Furthermore, in a data set of >800 human cancer cell lines, we identify parameters influencing the enrichment of p53 mutated cells, including strong baseline CDKN1A expression as a predictor for an active CRISPR-p53 axis. Taken together, our data identify strategies enabling safe CRISPR use.
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