title: [p53 activation by PI-3K family kinases after DNA double-strand breaks].
abstract: p53 plays a central role in the cellular response to DNA double-strand breaks (DSBs), and to DNA damage in general. The protein kinases ATM, ATR and DNA-PK detect DSBs and transmit this information to p53 by phosphorylation. This phosphorylation dissociates p53 from its negative regulator, mdm2. p53 then undergoes further modification and activates transcription of the genes responsible for cell cycle arrest. In certain circumstances, p53 also activates transcription of the genes responsible for apoptosis. The dysfunction of this cascade of events is oncogenic, with P53 itself being the most commonly mutated gene in malignant cells, although mutations in both the DNA damage sensors and cell cycle checkpoint and apoptosis effectors are frequent. A more complete understanding of p53 and the proteins it interacts with may allow the development of new cancer treatments.
authors.affiliation: Laboratoire d'oncologie moléculaire, de lutte contre le cancer. Centre Jean-Perrin, 58, rue Montalembert, BP 392, 63011 Clermont-Ferrand Cedex 1.
authors.forename: D
authors.initials: D
authors.lastname: Pernin
authors.forename: N
authors.initials: N
authors.lastname: Uhrhammer
authors.forename: P
authors.initials: P
authors.lastname: Verrelle
authors.forename: Y J
authors.initials: YJ
authors.lastname: Bignon
authors.forename: J O
authors.initials: JO
authors.lastname: Bay
mesh_terms: D000107:Acetylation; D017209:Apoptosis / Q000235:genetics; D064007:Ataxia Telangiectasia Mutated Proteins; D018797:Cell Cycle Proteins / Q000502:physiology*; D004249:DNA Damage; D051747:DNA-Activated Protein Kinase; D004268:DNA-Binding Proteins; D015972:Gene Expression Regulation, Neoplastic; D016158:Genes, p53 / Q000502:physiology*; D006801:Humans; D009687:Nuclear Proteins; D010766:Phosphorylation; D017346:Protein Serine-Threonine Kinases / Q000502:physiology*; D014158:Transcription, Genetic; D016159:Tumor Suppressor Protein p53 / Q000502:physiology*; D025521:Tumor Suppressor Proteins
chemical_list: D018797:Cell Cycle Proteins; D004268:DNA-Binding Proteins; D009687:Nuclear Proteins; D016159:Tumor Suppressor Protein p53; D025521:Tumor Suppressor Proteins; C576324:ATM protein, human; C576597:ATR protein, human; D064007:Ataxia Telangiectasia Mutated Proteins; D051747:DNA-Activated Protein Kinase; C497263:PRKDC protein, human; D017346:Protein Serine-Threonine Kinases