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Poly(ADP-ribose) polymerase activity is not affected in ataxia telangiectasia cells and knockout mice
Unité 9003 du Centre National de la Recherche Scientifique, Laboratoire conventionné avec le Commissariat à l'Energie Atomique, Ecole Supérieure de Biotechnologie de Strasbourg, boulevard Sébastien Brant, F-67400 Illkirch-Graffenstaden, France and
1 Genetic Disease Research Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892, USA
Poly(ADP-ribose) polymerase (PARP) is a constitutive factor of the DNA damage surveillance network in dividing cells. Based on its capacity to bind to DNA strand breaks, PARP plays a regulatory role in their resolution in vivo. ATM belongs to a large family of proteins involved in cell cycle progression and checkpoints in response to DNA damage. Both proteins may act as sensors of DNA damage to induce multiple signalling pathways leading to activation of cell cycle checkpoints and DNA repair. To determine a possible relationship between PARP and ATM, we examined the PARP response in an ATM-null background. We demonstrated that ATM deficiency does not affect PARP activity in human cell lines or Atm-deficient mouse tissues, nor does it alter PARP activity induced by oxidative damage or
-irradiation. Our results support a model in which PARP and ATM could be involved in distinct pathways, both effectors transducing the damage signal to cell cycle regulators.
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