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Aging involves self-destruction (phenoptosis) via epigenetic changes. Current epigenetic clocks may mislead by not distinguishing between lifespan-extending and lifespan-shortening epigenetic changes, necessitating new experimental approaches.

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Area of Science:

  • Gerontology
  • Epigenetics
  • Molecular Biology

Background:

  • Aging involves a programmed self-destruction (phenoptosis) driven by epigenetic changes.
  • Two types of epigenetic changes occur: type (1) promotes self-destruction, while type (2) responds to damage for survival.
  • Epigenetic clocks offer rapid assessment of anti-aging interventions but currently fail to differentiate between these two types of epigenetic changes.

Purpose of the Study:

  • To highlight the limitations of current epigenetic clocks in distinguishing between lifespan-extending and lifespan-shortening epigenetic modifications.
  • To propose the necessity of separating type (1) and type (2) epigenetic changes for accurate biological age assessment.
  • To suggest that epigenetic changes are mechanisms, not the primary timekeepers of aging.

Main Methods:

  • Critically analyze the existing literature on epigenetic clocks and their application in aging research.
  • Propose new experimental designs to differentiate between type (1) and type (2) epigenetic changes.
  • Discuss the potential role of the hypothalamus as a biological timekeeping mechanism.

Main Results:

  • Existing epigenetic clocks may be misleading because they do not distinguish between type (1) and type (2) epigenetic changes.
  • Reversing type (1) epigenetic changes can extend lifespan, whereas reversing type (2) can shorten it.
  • Epigenetic changes implement phenoptosis but are not the primary biological clock.

Conclusions:

  • Accurate measurement of biological age requires distinguishing between distinct types of epigenetic changes.
  • Future anti-aging interventions should target the fundamental biological clock, not solely epigenetic markers.
  • The primary timekeeping mechanism of aging remains to be fully elucidated, with potential links to the hypothalamus.