Telomeres

Definition

Telomeres are protective DNA-protein structures at the ends of chromosomes. They help prevent chromosome ends from being mistaken for damaged DNA and play a key role in preserving genome stability during cell division. [1] [2] [3]

Why It Matters in Ageing Research

Telomeres matter because they tend to shorten with repeated cell division in many cell types, and very short telomeres can contribute to cellular senescence or loss of regenerative capacity. This has made telomeres an important part of ageing biology, although telomere length alone does not capture the full ageing process. [6] [7] [9]

Common Confusion

• Telomeres are not the same as telomerase, the enzyme involved in telomere maintenance.
• Shorter telomeres are important, but telomere length is not a complete standalone measure of biological age.
• Telomere biology involves trade-offs, including links between tissue repair and cancer risk.

Related Reading

• Hallmarks of Ageing
• Cellular Senescence
• Biological Age

References

1. Blackburn, E. H., Greider, C. W., & Szostak, J. W. (2006). Telomeres and telomerase: the path from maize, Tetrahymena and yeast to human cancer and ageing. https://doi.org/10.1038/nm1006-1133
2. de Lange, T. (2010). How Shelterin Solves the Telomere End-Protection Problem. https://doi.org/10.1101/sqb.2010.75.017
3. Palm, W., & de Lange, T. (2008). How Shelterin Protects Mammalian Telomeres. https://doi.org/10.1146/annurev.genet.41.110306.130350
4. Lopez-Otin, C., et al. (2013). The Hallmarks of Aging. https://doi.org/10.1016/j.cell.2013.05.039
5. Sanders, J. L., & Newman, A. B. (2013). Telomere length in epidemiology: a biomarker of aging, age-related disease, both, or neither? https://doi.org/10.1093/epirev/mxs008
6. Bernardes de Jesus, B., & Blasco, M. A. (2013). Telomerase at the intersection of cancer and aging. https://doi.org/10.1016/j.tig.2013.05.003