One of the most critical targets is p21, an inhibitor of cyclin-dependent kinases. Additionally, tumors often exhibit heterogeneity, meaning not all cells may express the target receptors or undergo apoptosis.
P53 Gene Work Caspase Activation Pathway and Its Role in Cell Death
Depending on the severity of the stress, it can pause the cell cycle to allow repair, trigger programmed cell death, or maintain a state of permanent dormancy to prevent the propagation of mutations. By upregulating p21, p53 effectively halts the cell cycle at the G1/S checkpoint, preventing the replication of damaged DNA.
This evolutionary persistence underscores that the core logic of p53—detecting stress, integrating signals, and deciding between repair and death—is a cornerstone of cellular biology. When DNA damage occurs, kinases such as ATM and ATR phosphorylate p53, disrupting its binding to MDM2.
P53 Gene Work Caspase Activation Pathway
Loss-of-function mutations often disable the G1 checkpoint, allowing cells with genomic instability to proliferate unchecked. This interaction ensures the cell remains in a quiescent state, ready to respond to stress.
More About How does the p53 gene work
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