And don't get me wrong, I love me some CRISPR (you can ask @LauraTorrente4, @Laura_C_95 or @ritadorta ... ;). But to study stress responses (e.g to DNA damage) especially in p53 WT cells, maybe not the best idea? And I don't even want to think about KRAS, VHL and others...
BTW, when you use siRNAs, do you use a pool and then deconvolute? And if so, how variable would you say your effects are among the different siRNAs (even obtaining a similar knockdown efficiency)?