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Mitochondria01:37

Mitochondria

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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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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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Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
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Related Experiment Video

Updated: Apr 29, 2026

Measuring Single-Cell Aging with an Imaging-based Biomarker of Chromatin and Epigenetic Aging
09:10

Measuring Single-Cell Aging with an Imaging-based Biomarker of Chromatin and Epigenetic Aging

Published on: January 30, 2026

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Histone methylation and aging: lessons learned from model systems.

Brenna S McCauley1, Weiwei Dang2

  • 1Huffington Center on Aging, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, USA.

Biochimica Et Biophysica Acta
|May 27, 2014
PubMed
Summary
This summary is machine-generated.

Dynamic histone methylation influences aging. Modifications in histone methyltransferases and demethylases impact lifespan and aging phenotypes by regulating gene transcription across various organisms.

Keywords:
AgingEpigeneticsHistone methylation

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Area of Science:

  • Epigenetics and Molecular Biology
  • Gerontology

Background:

  • Aging is characterized by cellular and physiological decline.
  • Histone methylation is an emerging epigenetic mechanism influencing aging.

Purpose of the Study:

  • To review recent findings on the role of histone methylation in aging.
  • To highlight the regulatory functions of histone methylation in aging phenotypes.

Main Methods:

  • Literature review of studies on histone methylation and aging.
  • Analysis of invertebrate and mammalian models.

Main Results:

  • Histone methyltransferases and demethylases affect lifespan in invertebrates.
  • Altered histone methylation impacts aging phenotypes like oxidative stress response, insulin signaling, and senescence.
  • Histone methylation regulates transcription, a key mechanism in aging.

Conclusions:

  • Histone methylation plays a significant, though underappreciated, role in aging.
  • Histone methylation interacts with various cellular pathways involved in aging.