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- W4361823734 abstract "<div>Abstract<p>The integrity of DNA is constantly challenged throughout the life of a cell by both endogenous and exogenous stresses. A well-organized rapid damage response and proficient DNA repair, therefore, become critically important for maintaining genomic stability and cell survival. When DNA is damaged, the DNA damage response (DDR) can be initiated by alterations in chromosomal structure and histone modifications, such as the phosphorylation of the histone H2AX (the phosphorylated form is referred to as γ-H2AX). γ-H2AX plays a crucial role in recruiting DDR factors to damage sites for accurate DNA repair. On repair completion, γ-H2AX must then be reverted to H2AX by dephosphorylation for attenuation of the DDR. Here, we report that the wild-type p53–induced phosphatase 1 (Wip1) phosphatase, which is often overexpressed in a variety of tumors, effectively dephosphorylates γ-H2AX <i>in vitro</i> and <i>in vivo</i>. Ectopic expression of Wip1 significantly reduces the level of γ-H2AX after ionizing as well as UV radiation. Forced premature dephosphorylation of γ-H2AX by Wip1 disrupts recruitment of important DNA repair factors to damaged sites and delays DNA damage repair. Additionally, deletion of Wip1 enhances γ-H2AX levels in cells undergoing constitutive oncogenic stress. Taken together, our studies show that Wip1 is an important mammalian phosphatase for γ-H2AX and shows an additional mechanism for Wip1 in the tumor surveillance network. Cancer Res; 70(10); 4112–22. ©2010 AACR.</p></div>" @default.
- W4361823734 created "2023-04-05" @default.
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- W4361823734 date "2023-03-30" @default.
- W4361823734 modified "2023-09-27" @default.
- W4361823734 title "Data from Wip1 Directly Dephosphorylates γ-H2AX and Attenuates the DNA Damage Response" @default.
- W4361823734 doi "https://doi.org/10.1158/0008-5472.c.6500433" @default.
- W4361823734 hasPublicationYear "2023" @default.
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