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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Regulation of reactive oxygen species by atm is essential for proper response to DNA double-strand breaks in lymphocytes.

The ataxia telangiectasia-mutated ( ATM) gene plays a pivotal role in the maintenance of genomic stability. Although it has been recently shown that antioxidative agents inhibited lymphomagenesis in Atm(-/-) mice, the mechanisms remain unclear. In this study, we intensively investigated the roles of reactive oxygen species (ROS) in phenotypes of Atm(-/-) mice. Reduction of ROS by the antioxidant N-acetyl-l-cysteine (NAC) prevented the emergence of senescent phenotypes in Atm(-/-) mouse embryonic fibroblasts, hypersensitivity to total body irradiation, and thymic lymphomagenesis in Atm(-/-) mice. To understand the mechanisms for prevention of lymphomagenesis, we analyzed development of pretumor lymphocytes in Atm(-/-) mice. Impairment of Ig class switch recombination seen in Atm(-/-) mice was mitigated by NAC, indicating that ROS elevation leads to abnormal response to programmed double-strand breaks in vivo. Significantly, in vivo administration of NAC to Atm(-/-) mice restored normal T cell development and inhibited aberrant V(D)J recombination. We conclude that Atm-mediated ROS regulation is essential for proper DNA recombination, preventing immunodeficiency, and lymphomagenesis.[1]


  1. Regulation of reactive oxygen species by atm is essential for proper response to DNA double-strand breaks in lymphocytes. Ito, K., Takubo, K., Arai, F., Satoh, H., Matsuoka, S., Ohmura, M., Naka, K., Azuma, M., Miyamoto, K., Hosokawa, K., Ikeda, Y., Mak, T.W., Suda, T., Hirao, A. J. Immunol. (2007) [Pubmed]
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