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Related Concept Videos

Heterochromatin02:38

Heterochromatin

9.1K
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...
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Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

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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

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...
6.2K
Euchromatin01:01

Euchromatin

6.7K
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
6.7K
Chromatin Modification in iPS Cells01:32

Chromatin Modification in iPS Cells

1.6K
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.
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
1.6K
Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

23.2K
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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Updated: May 20, 2025

Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
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Increased chromatin accessibility underpins senescence.

Stéphane Lopes-Paciencia1,2, Gerardo Ferbeyre1,2

  • 1Centre de recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Canada.

The FEBS Journal
|May 19, 2025
PubMed
Summary
This summary is machine-generated.

Cellular senescence, a state of cell cycle arrest, is characterized by increased chromatin accessibility. This opening of the genome, particularly in noncoding regions, drives senescence and influences its associated traits, offering therapeutic targets.

Keywords:
ERK signalingcancerchromatinepigeneticsheterochromatinnucleolussenescencetransposons

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Area of Science:

  • Cell Biology
  • Genomics
  • Molecular Biology

Background:

  • Cellular senescence is a complex state induced by diverse stressors.
  • A universal trigger for senescence remains elusive.
  • Chromatin opening in the noncoding genome is a recognized hallmark of senescence.

Purpose of the Study:

  • To propose a unifying model for cellular senescence.
  • To elucidate the role of chromatin accessibility in senescence commitment.
  • To identify potential therapeutic targets by understanding senescence mechanisms.

Main Methods:

  • Review and synthesis of recent data on chromatin dynamics in senescence.
  • Development of a conceptual model linking chromatin accessibility to senescence fate.
  • Analysis of how histone-modifying complexes influence chromatin accessibility.

Main Results:

  • Increased chromatin accessibility, driven by transcription factors, is proposed as a decisive factor for senescence commitment.
  • The balance of chromatin accessibility mechanisms dictates engagement with senescence.
  • Specific histone-modifying complexes can modulate this balance.
  • Traits of senescent cells, including altered nuclear morphology and inflammatory cytokine secretion, are linked to increased chromatin accessibility.

Conclusions:

  • Chromatin opening is a central mechanism committing cells to senescence, irrespective of the initial stressor.
  • Modulating chromatin accessibility presents a potential therapeutic strategy for cancer and age-related diseases.
  • Understanding the dynamics of chromatin accessibility offers new insights into senescence biology.