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Human fibroblasts, capable of expressing a kinase-dead form of ATR (ATRkd), can be sensitized to the cytotoxic effects of methyl methanesulfonate (MMS) by the PARP inhibitor 4-amino-1,8-naphthalimide (4-AN). The combination of MMS+4-AN results in accumulation of cells in S-phase of the cell cycle and activation of Chk1. Inhibition of ATR activity by expression of ATRkd suppresses the S-phase accumulation...
Xeroderma pigmentosum variant (XP-V) cells lack the damage-specific DNA polymerase η and have normal excision repair but show defective DNA replication after UV irradiation. Previous studies using cells transformed with SV40 or HPV16 (E6/E7) suggested that the S-phase response to UV damage is altered in XP-V cells with non-functional p53. To investigate the role of p53 directly we targeted p53 in...
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