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Related Concept Videos

Epigenetic Regulation01:46

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
Epigenetic Regulation01:37

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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Related Experiment Video

Updated: Jun 5, 2026

Immunohistochemical Detection of 5-Methylcytosine and 5-Hydroxymethylcytosine in Developing and Postmitotic Mouse Retina
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Progressive age-dependent DNA methylation changes start before adulthood in mouse tissues.

Masaki Takasugi1

  • 1Laboratory of Cellular Biochemistry, Animal Resource Science/Veterinary Medical Science, University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan. aa107111@mail.ecc.u-tokyo.ac.jp

Mechanisms of Ageing and Development
|December 28, 2010
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Summary

DNA methylation changes before adulthood predict later life changes, impacting age-related diseases. These epigenetic shifts in mouse tissues suggest a developmental trajectory throughout the lifespan.

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Area of Science:

  • Epigenetics
  • Molecular Biology
  • Gerontology

Background:

  • DNA methylation changes are linked to aging and age-related diseases.
  • Focus has primarily been on post-adulthood methylation changes, neglecting pre-adulthood alterations.
  • Understanding the full lifespan epigenetic dynamics is crucial for comprehending aging.

Purpose of the Study:

  • To investigate DNA methylation changes before and after adulthood across different tissues.
  • To determine if pre-adulthood methylation changes predict post-adulthood changes.
  • To explore the relationship between DNA methylation and gene expression during aging.

Main Methods:

  • Analysis of DNA methylation status at 316 CpG sites in TSS-flanking regions of 350 genes in mouse muscle, brain, and liver.
  • Comparison of methylation patterns before and after adulthood.
  • Correlation analysis between DNA methylation status and gene expression levels in young mice.
  • Validation using genome-wide methylation data.

Main Results:

  • Dozens of CpG sites showed age-dependent methylation changes, largely tissue-specific.
  • Most post-adulthood methylation changes were preceded by similar directional changes before adulthood.
  • Genes near progressively methylated sites showed lower expression, and those near demethylated sites showed higher expression in young mice.
  • These findings were consistent across analyzed tissues and validated with external data.

Conclusions:

  • DNA methylation patterns exhibit a consistent directional shift towards development/maturation throughout the lifespan.
  • Pre-adulthood epigenetic changes are predictive of age-dependent methylation alterations.
  • Tissue-specific epigenetic or transcriptional factors likely drive these lifespan methylation dynamics.