Induction of Apoptosis via Intrinsic Pathways If the DNA damage is irreparable, p53 shifts its role from protector to executioner. When DNA damage occurs, kinases such as ATM and ATR phosphorylate p53, disrupting its binding to MDM2.
P53 Gene Work Cancer Therapy Restoration
Loss-of-function mutations often disable the G1 checkpoint, allowing cells with genomic instability to proliferate unchecked. By upregulating p21, p53 effectively halts the cell cycle at the G1/S checkpoint, preventing the replication of damaged DNA.
Target Gene Regulation and Cell Cycle Arrest Once stabilized, p53 binds to specific DNA response elements to regulate the expression of numerous target genes. Therapeutic Implications and Oncogenic Resistance Understanding how p53 works has been fundamental to oncology, as mutations in this gene are present in over 50% of human cancers.
P53 Gene Work Cancer Therapy Restoration
The result is the activation of caspases and the systematic dismantling of the cell to prevent oncogenic transformation. One of the most critical targets is p21, an inhibitor of cyclin-dependent kinases.
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