Phosphorylation of Artemis following irradiation-induced DNA damage - PubMed (original) (raw)
. 2004 Nov;34(11):3146-55.
doi: 10.1002/eji.200425455.
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- PMID: 15468306
- DOI: 10.1002/eji.200425455
Free article
Phosphorylation of Artemis following irradiation-induced DNA damage
Catherine Poinsignon et al. Eur J Immunol. 2004 Nov.
Free article
Abstract
Artemis is a DNA repair factor required for V(D)J recombination, repair of DNA damage induced by ionizing radiation (IR) or radiomimetic drugs, and the maintenance of genome integrity. During V(D)J recombination, Artemis participates in the resolution of hairpin-sealed coding ends, a step crucial to the constitution of the gene encoding for the antigen receptor of lymphocytes. The precise role of Artemis in the repair of IR-induced DNA damage remains to be elucidated. Here we show that Artemis is constitutively phosphorylated in cultured cells and undergoes additional phosphorylation events after irradiation. The IR-induced phosphorylation is mainly, although not solely, dependent on Ataxia-telangiectasia-mutated kinase (ATM). The physiological role of these phosphorylation events remains unknown, as in vitro-generated Artemis mutants, which present impaired IR-induced phosphorylation, still display an activity sufficient to complement the V(D)J recombination defect and the increased radiosensibility of Artemis-deficient cells. Thus, Artemis is an effector of DNA repair that can be phosphorylated by ATM, and possibly by DNA-PKcs and ATR depending upon the type of DNA damage.
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