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Related Concept Videos

Aging01:26

Aging

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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
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The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Cognitive development continues throughout adulthood, undergoing significant shifts across early, middle, and late stages. Individual transition occurs from adolescent idealism to pragmatic and adaptable thinking in early adulthood. During this period, individuals learn to integrate personal beliefs with the recognition that other perspectives are equally valid. Exposure to the complexities of modern society, diverse experiences, and higher education contribute to this adaptive thought process,...
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Chromatin Modification in iPS Cells01:32

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Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
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Related Experiment Video

Updated: Mar 22, 2026

A Chromatin Assay for Human Brain Tissue
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Epigenetic assimilation in the aging human brain.

Gabriel Oh1, Sasha Ebrahimi1, Sun-Chong Wang2

  • 1Krembil Family Epigenetics Laboratory, Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health, 250 College St. R130, Toronto, Ontario, M5T 1R8, Canada.

Genome Biology
|April 29, 2016
PubMed
Summary

Aging cells surprisingly become more similar epigenetically and transcriptionally in later life, a phenomenon termed epigenetic assimilation. This convergence may explain aging mechanisms and age-related diseases.

Keywords:
AgingAlzheimer’s diseaseDNA methylationDedifferentiationEpigenetic driftEpigeneticsGenomic organizationTranscriptome

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Area of Science:

  • Molecular Biology
  • Gerontology
  • Neuroscience

Background:

  • Epigenetic drift increases DNA modification variability in aging cells.
  • The long-term outcome of epigenetic divergence in aging is not well understood.
  • This study investigates DNA modification and transcription dynamics in late-life human aging.

Purpose of the Study:

  • To explore the dynamics of DNA modification and transcription in the later stages of human life.
  • To investigate the convergence of epigenetic and transcriptional profiles in older individuals.
  • To examine the role of epigenetic assimilation in aging and neurodegenerative diseases.

Main Methods:

  • Analysis of DNA modification profiles in aging human brain tissues.
  • Transcriptional profiling of brain tissues from younger and older individuals.
  • Comparative analysis of epigenetic and transcriptional data in twins, including those with Alzheimer's disease.

Main Results:

  • Older individuals (>75 years) exhibit increased epigenetic and transcriptional similarity in brain tissues compared to younger individuals.
  • Epigenetic assimilation correlates with increased similarity between the cerebral cortex and cerebellum, suggesting potential cell dedifferentiation.
  • Alzheimer's disease in twins shows potential for accelerated epigenetic assimilation.
  • Loss of boundaries and merging of neighboring DNA modification and transcriptomic domains were observed over time.

Conclusions:

  • Epigenetic divergence paradoxically shifts to convergence in later life stages.
  • Epigenetic assimilation and tissue dedifferentiation are novel phenomena that may clarify molecular aging mechanisms.
  • These findings offer insights into the origins of age-related diseases.