The main kinases involved in detection of DNA damage during the activation of the checkpoints are ATR and ATM Chk1 and Chk2 APC and the MCM helicase p53 and pRb p53 and p27 p27 and p21
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Checkpoints are mechanisms that halt the cell cycle if DNA damage is detected, preventing the propagation of mutations. Show more…
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The ATM-p53 repair pathway is a crucial mechanism for maintaining genomic stability in both normal cells and cancerous cells. ATM (ataxia-telangiectasia mutated) is a protein kinase that plays a key role in detecting DNA damage and initiating the appropriate cellular response. In normal cells, when DNA damage occurs, ATM is activated and phosphorylates the tumor suppressor protein p53. This phosphorylation event stabilizes p53 and allows it to accumulate in the nucleus, where it can activate the transcription of genes involved in DNA repair, cell cycle arrest, or apoptosis. In the context of cancerous cells, the ATM-p53 repair pathway can be dysregulated or impaired. Mutations in the ATM gene or alterations in the p53 pathway can lead to the loss of proper DNA damage response and repair mechanisms. This can result in genomic instability and the accumulation of additional mutations, contributing to the development and progression of cancer. Furthermore, cancer cells may exhibit defects in the downstream effectors of the ATM-p53 pathway, such as the genes involved in DNA repair or cell cycle regulation. These defects can further compromise the ability of cancer cells to repair DNA damage and maintain genomic stability. Understanding the ATM-p53 repair pathway in both normal and cancerous cells is crucial for developing targeted therapies that can exploit the vulnerabilities of cancer cells while sparing normal cells. By selectively targeting the dysregulated components of the ATM-p53 pathway, it may be possible to enhance the efficacy of cancer treatments and minimize side effects.
Adi S.
In response to DNA damage, the cell cycle progression protein Rb is phosphorylated and activates the transcription of a Cdk inhibitor to halt cell proliferation. The proteins involved in this process include p21, p27, and p53.
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