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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
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How does the body know how old it is? Introducing the epigenetic clock hypothesis.

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Biological clocks influence aging. This study proposes a novel epigenetic clock, based on DNA methylation in stem cells, as a potential regulator of senescence and a target for medical intervention.

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Area of Science:

  • Gerontology and Epigenetics
  • Molecular Biology and Aging Research

Background:

  • Organisms possess biological clocks regulating various life processes, including development and reproduction.
  • Aging may be centrally orchestrated by biological clocks, rather than being a random process.
  • Previous aging clock candidates include the suprachiasmatic nucleus, hypothalamus, thymus involution, and cellular senescence.

Purpose of the Study:

  • To propose a novel biological clock mechanism for organismal aging.
  • To investigate the role of epigenetics and DNA methylation in regulating aging processes.
  • To identify potential targets for medical interventions to slow or reverse aging.

Main Methods:

  • Review of evolutionary theories on aging and biological clocks.
  • Analysis of age-related changes in gene expression and DNA methylation.
  • Focus on epigenetic modifications, specifically chromosome methylation, in stem cells.

Main Results:

  • Cellular senescence, linked to telomere attrition, is a validated primary regulator of aging.
  • DNA methylation patterns change characteristically with age.
  • A novel aging clock candidate based on epigenetics and stem cell methylation is proposed.

Conclusions:

  • Epigenetic regulation, particularly DNA methylation in stem cells, may function as a central aging clock.
  • This proposed mechanism offers a potential, albeit challenging, target for anti-aging therapies.
  • Further validation is required to confirm the role of this epigenetic clock in aging.