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Related Concept Videos

Replicative Cell Senescence02:15

Replicative Cell Senescence

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 the telomeric...
Replicative Cell Senescence02:15

Replicative Cell Senescence

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 the telomeric...
Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

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 DNA...
Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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 timing and level of...
Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

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 is an enzyme that can...
Duplication of Chromatin Structure02:05

Duplication of Chromatin Structure

The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...

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Related Experiment Video

Updated: Jul 16, 2026

Techniques to Induce and Quantify Cellular Senescence
06:51

Techniques to Induce and Quantify Cellular Senescence

Published on: May 1, 2017

Cellular senescence and chromatin organisation.

M Narita1

  • 1Cancer Research UK, Cambridge Research Institute, Robinson Way, Cambridge, UK. masashi.narita@cancer.org.uk

British Journal of Cancer
|February 22, 2007
PubMed
Summary

Cellular senescence is crucial for tumor suppression, but how it works is unclear. This review explores how changes in chromatin structure stabilize the senescence phenotype, impacting tumor suppression.

Area of Science:

  • Cellular biology
  • Cancer research
  • Epigenetics

Background:

  • Cellular senescence plays a key role in preventing tumor formation.
  • The precise mechanisms by which senescence suppresses tumors remain largely unknown.
  • Emerging evidence points to the involvement of chromatin modifications in maintaining the senescence state.

Purpose of the Study:

  • To review recent findings on the connection between senescence and chromatin biology.
  • To elucidate how chromatin alterations contribute to the stability of the senescence phenotype.
  • To highlight the implications for tumor suppression.

Main Methods:

  • Literature review of recent studies.
  • Analysis of research on senescence and chromatin dynamics.

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A Quantitative Measurement of Reactive Oxygen Species and Senescence-associated Secretory Phenotype in Normal Human Fibroblasts During Oncogene-induced Senescence
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A Quantitative Measurement of Reactive Oxygen Species and Senescence-associated Secretory Phenotype in Normal Human Fibroblasts During Oncogene-induced Senescence

Published on: August 12, 2018

Induction and Validation of Cellular Senescence in Primary Human Cells
08:18

Induction and Validation of Cellular Senescence in Primary Human Cells

Published on: June 20, 2018

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Last Updated: Jul 16, 2026

Techniques to Induce and Quantify Cellular Senescence
06:51

Techniques to Induce and Quantify Cellular Senescence

Published on: May 1, 2017

A Quantitative Measurement of Reactive Oxygen Species and Senescence-associated Secretory Phenotype in Normal Human Fibroblasts During Oncogene-induced Senescence
13:59

A Quantitative Measurement of Reactive Oxygen Species and Senescence-associated Secretory Phenotype in Normal Human Fibroblasts During Oncogene-induced Senescence

Published on: August 12, 2018

Induction and Validation of Cellular Senescence in Primary Human Cells
08:18

Induction and Validation of Cellular Senescence in Primary Human Cells

Published on: June 20, 2018

  • Synthesis of findings on the interplay between epigenetic regulation and cellular senescence.

    • Main Results:

    • Alterations in chromatin structure are increasingly recognized as critical for establishing and maintaining the senescence phenotype.
    • Specific epigenetic modifications influence the stability and heritability of senescence.
    • The chromatin environment impacts the functional outcomes of senescence in tumor suppression.

    Conclusions:

    • Understanding the role of chromatin biology in senescence is essential for deciphering its tumor-suppressive functions.
    • Targeting chromatin modifications may offer novel therapeutic strategies for cancer.
    • Further research is needed to fully unravel the complex interplay between senescence and epigenetics in cancer prevention.