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Mammalian DNA repair responses and genomic instability
1Laboratory of Molecular Genetics, National Institutes on Aging, National Institute of Health, Baltimore, MD 21224, USA.
Abstract:
A cell responds to damage to its DNA in one of three ways: by tolerating the damage, by repairing the damage or by undergoing apoptosis. The latter two responses represent defenses against genomic instability and tumorigenesis resulting from unrepaired damage. There are multiple DNA repair pathways to cope with a variety of damage reflecting the importance of DNA repair in maintaining both cell viability and genomic stability. These include base excision repair, mismatch repair, double-strand break repair and nucleotide excision repair. Several signal transduction pathways are activated by DNA damage resulting in cell-cycle arrest. Cell-cycle arrest increases the time available for DNA repair before DNA replication and mutation fixation. Recently, there has been tremendous progress in our understanding of the molecular components repair processes and to examine recently observed interactions between DNA repair, signal transduction pathways and other cellular processes such as cell-cycle control, transcription, replication and recombination.
Insights
Cells defend against DNA damage through tolerance, repair, or apoptosis. DNA repair pathways maintain genomic stability and cell viability, with recent advances illuminating their interactions with cellular processes.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- Cells possess mechanisms to respond to DNA damage, including tolerance, repair, and apoptosis.
- DNA repair is crucial for preventing genomic instability and tumorigenesis.
- Multiple DNA repair pathways exist, such as base excision repair, mismatch repair, double-strand break repair, and nucleotide excision repair.
Purpose of the Study:
- To summarize the molecular components of DNA repair processes.
- To examine the interactions between DNA repair, signal transduction, and other cellular processes.
Main Methods:
- Review of recent scientific literature on DNA damage response.
- Analysis of molecular mechanisms underlying DNA repair pathways.
- Investigation of signal transduction pathways activated by DNA damage.
Main Results:
- DNA damage triggers distinct cellular responses: tolerance, repair, or apoptosis.
- Cell-cycle arrest is a common response to DNA damage, facilitating repair.
- Interactions between DNA repair, signal transduction, cell-cycle control, transcription, replication, and recombination are complex and interconnected.
Conclusions:
- DNA repair is essential for cell viability and genomic stability.
- Understanding DNA repair mechanisms and their interplay with cellular processes is critical for comprehending cell fate and disease prevention.
- Recent progress has significantly advanced our knowledge of these intricate molecular networks.