A pathway of double strand break rejoining dependent upon ATM, Artemis and proteins locating to g-H2AX foci

Riballo, E., Kuhne, M., Rief, N., Doherty, A. J., Smith, G. C. M., Recio, M-J., Reis, C., Dahm, K., Fricke, A., Krempler, A., Parker, A. R., Jackson, S. P., Gennery, A. R., Jeggo, P. A. and Lobrich, M. (2004) A pathway of double strand break rejoining dependent upon ATM, Artemis and proteins locating to g-H2AX foci. Molecular Cell, 16. pp. 715-724. ISSN 1097-2765

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Abstract

The hereditary disorder ataxia telangiectasia (A-T) is associated with striking cellular radiosensitivity that cannot be attributed to the characterized cell cycle checkpoint defects. By epistasis analysis, we show that ataxia telangiectasia mutated protein (ATM) and Artemis, the protein defective in patients with RS-SCID, function in a common double-strand break (DSB) repair pathway that also requires H2AX, 53BP1, Nbs1, Mre11, and DNA-PK. We show that radiation-induced Artemis hyperphosphorylation is ATM dependent. The DSB repair process requires Artemis nuclease activity and rejoins approximately 10% of radiation-induced DSBs. Our findings are consistent with a model in which ATM is required for Artemis-dependent processing of double-stranded ends with damaged termini. We demonstrate that Artemis is a downstream component of the ATM signaling pathway required uniquely for the DSB repair function but dispensable for ATM-dependent cell cycle checkpoint arrest. The significant radiosensitivity of Artemis-deficient cells demonstrates the importance of this component of DSB repair to survival.

Item Type: Article
Additional Information: GDSC109
Depositing User: Gee Wheatley
Date Deposited: 20 Mar 2007
Last Modified: 30 Nov 2012 16:51
URI: http://sro.sussex.ac.uk/id/eprint/974
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