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Related Concept Videos

Chromatin Packaging02:21

Chromatin Packaging

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Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter? 
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order...
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Chromatin Packaging01:32

Chromatin Packaging

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Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...
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Spreading of Chromatin Modifications02:25

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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.
Writers
The writer...
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Inheritance of Chromatin Structures03:17

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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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Chromatin Position Affects Gene Expression02:35

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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the...
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Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...
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Related Experiment Video

Updated: Feb 11, 2026

Techniques to Induce and Quantify Cellular Senescence
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Techniques to Induce and Quantify Cellular Senescence

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Chromatin Architectural Changes during Cellular Senescence and Aging.

Luyang Sun1, Ruofan Yu2, Weiwei Dang3

  • 1Huffington Center on Aging, Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA. Luyang.Sun@bcm.edu.

Genes
|April 17, 2018
PubMed
Summary
This summary is machine-generated.

Chromatin 3D structure changes dynamically during aging and cellular senescence. This review covers genome architecture, regulatory factors, and their alterations in aging and senescence.

Keywords:
Hi-Cagingcellular senescencechromatin architecture

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Last Updated: Feb 11, 2026

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

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296

Area of Science:

  • Genomics
  • Cell Biology
  • Aging Research

Background:

  • Chromatin 3D structure is dynamic and crucial for biological processes like cell differentiation and aging.
  • Recent advances in chromosome conformation capture technologies reveal insights into genome architecture dynamics.
  • Cellular senescence and aging are linked to significant chromatin structural changes, including heterochromatin alterations.

Purpose of the Study:

  • To review recent findings on genome architecture and its regulation.
  • To explore how chromatin spatial organization changes during cellular senescence and aging.

Main Methods:

  • Review of recent scientific literature.
  • Analysis of data from chromosome conformation capture technologies.

Main Results:

  • Dynamic changes in chromatin 3D structure are associated with aging and senescence.
  • Alterations in heterochromatin and higher-order chromatin structure occur during these processes.
  • Specific factors regulating chromatin spatial organization are identified.

Conclusions:

  • Understanding genome architecture dynamics is key to comprehending cellular senescence and aging.
  • Further research into chromatin regulation can provide insights into age-related diseases.