Ataxia telangiectasia mutated (ATM) is an ATP-dependent phosphatidylinositol 3-kinase-related kinase (PIKK) serine/threonine protein kinase. ATM is related to ATR, DNA-PKcs, mTOR, SMG1 and the non-enzymatic TRRAP within this enzyme family. Importantly, ATM is a central player in the mitotic DNA damage response (DDR), increasing the response to DNA double-strand...