The Molecular Mechanism of Activation Under normal conditions, the p53 protein is kept at low levels by MDM2, an E3 ubiquitin ligase that tags it for destruction. This post-translational modification stabilizes the protein, allowing it to accumulate in the nucleus and function as a transcription factor.
How P53 Gene Works in Cellular Decision Making
When DNA damage occurs, kinases such as ATM and ATR phosphorylate p53, disrupting its binding to MDM2. Challenges in Gene Therapy Applications Despite the promise of p53-based treatments, clinical applications face significant hurdles.
Consequently, many targeted cancer therapies aim to restore p53 function or mimic its activity. 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.
How P53 Gene Orchestrates Cellular Decision Making at the Molecular Level
Induction of Apoptosis via Intrinsic Pathways If the DNA damage is irreparable, p53 shifts its role from protector to executioner. It transactivates pro-apoptotic genes such as BAX, PUMA, and NOXA while repressing anti-apoptotic genes like BCL-2.
More About How does the p53 gene work
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