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J Biol Chem, Vol. 274, Issue 44, 31127-31130, October 29, 1999

COMMUNICATION
Sensing of Ionizing Radiation-induced DNA Damage by ATM through Interaction with Histone Deacetylase

Gun D. Kim, Yung H. Choi, Alexandre Dimtchev, Sook J. Jeong, Anatoly Dritschilo, and Mira Jung^§

From the Departments of  Radiation Medicine and ^§ Microbiology, Division of Radiation Research, Vincent T. Lombardi Cancer Center, Georgetown University Medical Center, Washington, D. C. 20007

The ATM gene is mutated in individuals with ataxia telangiectasia, a human genetic disease characterized by extreme sensitivity to radiation. The ATM protein acts as a sensor of radiation-induced cellular damage and contributes to cell cycle regulation, signal transduction, and DNA repair; however, the mechanisms underlying these functions of ATM remain largely unknown. Binding and immunoprecipitation assays have now shown that ATM interacts with the histone deacetylase HDAC1 both in vitro and in vivo, and that the extent of this association is increased after exposure of MRC5CV1 human fibroblasts to ionizing radiation. Histone deacetylase activity was also detected in immunoprecipitates prepared from these cells with antibodies to ATM, and this activity was blocked by the histone deacetylase inhibitor trichostatin A. These results suggest a previously unanticipated role for ATM in the modification of chromatin components in response to ionizing radiation.

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