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Cellular responses to DNA damage: cell-cycle checkpoints, apoptosis and the roles of p53 and ATM
Trends in Biochemical Sciences
|October 1, 1995
Abstract:
'Checkpoint' controls arrest the cell cycle after DNA damage, allowing repair to take place before mutations can be perpetuated. In multicellular organisms, DNA damage can also induce apoptotic cell death, protecting the organism at the expense of the individual cell. How does a cell 'choose' between cycle arrest and death? Analysis of two human tumour suppressor proteins, p53 and the ATM (ataxia-telangiectasia mutated) gene product, may provide some answers.
Insights
DNA damage triggers cell cycle arrest for repair or apoptosis for organism protection. Analyzing p53 and ATM proteins may reveal how cells choose between these outcomes.
Area of Science:
- Cellular biology
- Genetics
- Molecular biology
Background:
- Cell cycle checkpoints halt cell division after DNA damage, enabling repair.
- DNA damage can also trigger programmed cell death (apoptosis) in multicellular organisms.
- The decision between cell cycle arrest and apoptosis is crucial for organismal health.
Purpose of the Study:
- To investigate the mechanisms by which cells decide between cell cycle arrest and apoptotic cell death following DNA damage.
- To analyze the roles of human tumor suppressor proteins p53 and ATM in this decision-making process.
Main Methods:
- Analysis of the functions of p53 protein.
- Analysis of the functions of the ataxia-telangiectasia mutated (ATM) gene product.
- Investigating the interplay between p53, ATM, and cellular responses to DNA damage.
Main Results:
- The study focuses on understanding the molecular pathways involved in the cell's response to DNA damage.
- Key insights are expected from examining the roles of p53 and ATM, known regulators of cell cycle and DNA repair.
- The research aims to elucidate how these proteins influence the choice between cell cycle arrest and apoptosis.
Conclusions:
- Understanding the p53 and ATM pathways is critical for deciphering the cell's fate after DNA damage.
- This research may reveal novel therapeutic targets for cancer and other diseases involving DNA damage.
- The findings will contribute to a deeper understanding of fundamental biological processes governing cell survival and death.