DNA Damage Response

Definition

The DNA damage response, often abbreviated DDR, is the network of cellular systems that detect DNA damage, signal that damage has occurred, pause cell-cycle progression when needed, coordinate DNA repair, or trigger outcomes such as senescence or cell death if damage is too severe. It helps preserve genome integrity when DNA is damaged by normal metabolism, replication errors, radiation, chemicals, or other stresses. [1] [2] [3]

Why It Matters in Ageing Research

The DNA damage response matters in ageing because genome maintenance is essential for long-term tissue function. When DNA damage accumulates or repair and signalling systems become less effective, cells may malfunction, enter cellular senescence, die, or contribute to inflammation and loss of regenerative capacity. DDR pathways are therefore closely linked to genomic instability, cancer suppression, stem-cell ageing, and other ageing-related mechanisms. [3] [4] [5]

Common Confusion

• The DNA damage response is not one repair pathway; it is a broader detection, signalling, and decision-making network.
• Activating the DDR can protect against cancer, but chronic activation can also contribute to senescence and tissue dysfunction.
• DNA damage does not always lead to mutation, because many forms of damage can be repaired.

Related Reading

• Genomic Instability
• Cellular Senescence

References

1. Jackson, S. P., & Bartek, J. (2009). The DNA-damage response in human biology and disease. https://pubmed.ncbi.nlm.nih.gov/19847258/
2. Ciccia, A., & Elledge, S. J. (2010). The DNA damage response: Making it safe to play with knives. https://pubmed.ncbi.nlm.nih.gov/20832717/
3. Lord, C. J., & Ashworth, A. (2012). The DNA damage response and cancer therapy. https://pubmed.ncbi.nlm.nih.gov/22193477/
4. Hoeijmakers, J. H. J. (2009). DNA damage, aging, and cancer. https://pubmed.ncbi.nlm.nih.gov/19418601/
5. López-Otín, C., et al. (2013). The hallmarks of aging. https://pubmed.ncbi.nlm.nih.gov/23746838/