In the G1 phase there are two types of DNA damage responses, the p53-dependent and the p53-independent pathways. The p53-dependent responses inhibit CDKs through the up-regulation of genes encoding CKIs mediated by the p53 protein, whereas the p53-independent mechanisms inhibit CDKs through the inhibitory T14Y15 phosphorylation of Cdk2. Failure of DNA damage checkpoints in G1 leads to mutagenic replication of damaged templates and other replication defects.
Source: Reactome http://www.reactome.org/cgi-bin/eventbrowser?DB=gk_current&FOCUS_SPECIES=Homo%20sapiens&ID=69615&
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The current version of this pathway was approved for data analysis by Martina Kutmon.
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Maeda T, Hanna AN, Sim AB, Chua PP, Chong MT, Tron VA; ''GADD45 regulates G2/M arrest, DNA repair, and cell death in keratinocytes following ultraviolet exposure.''; J Invest Dermatol, 2002 PubMedEurope PMCScholia
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