Activation of ATM and Chk2 kinases in relation to the amount of DNA strand breaks

  title={Activation of ATM and Chk2 kinases in relation to the amount of DNA strand breaks},
  author={Giacomo Buscemi and Paola Perego and Nives Carenini and Makoto Nakanishi and Luciana Chessa and Junjie Chen and Kumkum Khanna and Domenico Delia},
The diverse checkpoint responses to DNA damage may reflect differential sensitivities by molecular components of the damage-signalling network to the type and amount of lesions. Here, we determined the kinetics of activation of the checkpoint kinases ATM and Chk2 (the latter substrate of ATM) in relation to the initial yield of genomic DNA single-strand (SSBs) and double-strand breaks (DSBs). We show that doses of γ-radiation (IR) as low as 0.25 Gy, which generate vast numbers of SSBs but only… CONTINUE READING


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