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Cited by 1,014

The DOI matches its Crossref record; 12 of the 12 references it cites were found in a registry or an index.

ATM and DNA-PK Function Redundantly to Phosphorylate H2AX after Exposure to Ionizing Radiation

Open access
Stiff, Tom, O’Driscoll, Mark, Rief, Nicole, Iwabuchi, Kuniyoshi, Löbrich, Markus, Jeggo, Penny A.·2004·Cancer Research

Abstract

H2AX phosphorylation is an early step in the response to DNA damage. It is widely accepted that ATM (ataxia telangiectasia mutated protein) phosphorylates H2AX in response to DNA double-strand breaks (DSBs). Whether DNA-dependent protein kinase (DNA-PK) plays any role in this response is unclear. Here, we show that H2AX phosphorylation after exposure to ionizing radiation (IR) occurs to similar extents in human fibroblasts and in mouse embryo fibroblasts lacking either DNA-PK or ATM but is ablated in ATM-deficient cells treated with LY294002, a drug that specifically inhibits DNA-PK. Additionally, we show that inactivation of both DNA-PK and ATM is required to ablate IR-induced H2AX phosphorylation in chicken cells. We confirm that H2AX phosphorylation induced by DSBs in nonreplicating cells is ATR (ataxia telangiectasia and Rad3-related protein) independent. Taken together, we conclude that under most normal growth conditions, IR-induced H2AX phosphorylation can be carried out by ATM and DNA-PK in a redundant, overlapping manner. In contrast, DNA-PK cannot phosphorylate other proteins involved in the checkpoint response, including chromatin-associated Rad17. However, by phosphorylating H2AX, DNA-PK can contribute to the presence of the damage response proteins MDC1 and 53BP1 at the site of the DSB.

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Metadata

Authors
Stiff, T., O’Driscoll, M., Rief, N., Iwabuchi, K., Löbrich, M., & Jeggo, P. A.
Venue
Cancer Research
Published
2004-04-01
Volume
64
Issue
7
Pages
2390-2396
ISSN
  • 0008-5472 (ISSN-L)
  • 1538-7445
OpenAlex
W2143629217
Cited by
1,014
References
12
FWCI
20.01
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: ATM and DNA-PK Function Redundantly to Phosphorylate H2AX after Exposure to Ionizing Radiation. https://app.cochat.ai/papers/10.1158/0008-5472.can-03-3207
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Stiff, T., O’Driscoll, M., Rief, N., Iwabuchi, K., Löbrich, M., & Jeggo, P. A. (2004). ATM and DNA-PK Function Redundantly to Phosphorylate H2AX after Exposure to Ionizing Radiation. Cancer Research. https://doi.org/10.1158/0008-5472.can-03-3207

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