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Aging and rejuvenation - a modular epigenome model.

Priscila Chiavellini1, Martina Canatelli-Mallat1, Marianne Lehmann1

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Epigenetic rejuvenation, driven by DNA methylation clocks, offers a strategy to reverse biological aging. Research suggests the epigenome, not just DNA methylation, influences aging reversal outcomes.

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Area of Science:

  • Biomedical Sciences
  • Epigenetics
  • Aging Research

Background:

  • Aging was historically viewed as irreversible, with interventions focused on slowing progression.
  • Breakthroughs in cloning and cell reprogramming shifted the understanding of aging.
  • The epigenome is now considered a key driver of the aging process.

Purpose of the Study:

  • To explore epigenetic rejuvenation as a strategy to reverse biological age.
  • To investigate the extent to which biological age can be reversed.
  • To propose a model explaining the outcomes of epigenetic rejuvenation.

Main Methods:

  • Utilizing DNA methylation (DNAm) biomarkers and algorithms like the Horvath clock.
  • Implementing epigenetic rejuvenation techniques in vivo.
  • Analyzing the impact of reversing DNA methylation clocks on organismal phenotype.

Main Results:

  • DNA methylation patterns serve as accurate biomarkers for biological age.
  • Forcing DNA methylation clocks backward in vivo resulted in partial phenotypic rejuvenation.
  • A bimodular epigenome model (Module A: DNAm clock, Module B: Remainder) was proposed to explain findings.

Conclusions:

  • Epigenetic rejuvenation holds potential for arresting or reversing organismal aging.
  • The epigenome's complexity, beyond DNA methylation clocks, influences rejuvenation outcomes.
  • Further research into the bimodular epigenome is warranted to fully understand aging reversal.