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Related Concept Videos

Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

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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 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 Regulation01:46

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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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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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Histone Modification02:32

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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
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Related Experiment Video

Updated: Feb 17, 2026

An Integrated Platform for Genome-wide Mapping of Chromatin States Using High-throughput ChIP-sequencing in Tumor Tissues
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Worldwide patterns of human epigenetic variation.

Oana Carja1,2, Julia L MacIsaac3,4, Sarah M Mah3,4

  • 1Department of Biology, Stanford University, Stanford, CA, 94305, USA. oana.carja@gmail.com.

Nature Ecology & Evolution
|November 30, 2017
PubMed
Summary

Global DNA methylation patterns mirror human genetic variation, showing greater evolutionary stability than in plants. This epigenetic diversity offers insights into recent human evolution and gene regulation.

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Area of Science:

  • Genomics
  • Epigenetics
  • Human Evolution

Background:

  • DNA methylation is a key epigenetic regulator of gene expression and organismal traits.
  • Existing research indicates human population differences in DNA methylation, but global patterns relative to genetic variation are unclear.

Purpose of the Study:

  • To investigate the relationship between DNA methylation patterns, genetic variation, and gene expression across diverse human populations.
  • To quantify epigenetic divergence rates and compare the evolutionary stability of DNA methylation in humans versus other species.

Main Methods:

  • Genome-wide DNA methylation analysis at 485,000 CpG sites in five human populations.
  • Integrated analysis with genome-wide genotype and gene expression data.
  • Estimation of epigenetic divergence rates between populations.

Main Results:

  • Population-specific DNA methylation patterns closely reflect underlying genetic variation.
  • DNA methylation exhibits stronger local genetic control compared to messenger RNA (mRNA) levels.
  • DNA methylation shows significantly higher evolutionary stability in humans than previously observed in plants.

Conclusions:

  • Epigenetic diversity, specifically DNA methylation, is globally structured and influenced by genetic variation in humans.
  • DNA methylation represents a relatively stable epigenetic mark during recent human evolution.
  • This study enhances understanding of human epigenetic diversity and its evolutionary dynamics.