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Related Concept Videos

Heterochromatin02:38

Heterochromatin

19.1K
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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Heterochromatin02:38

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Combinatorial Gene Control02:33

Combinatorial Gene Control

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Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
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Euchromatin01:01

Euchromatin

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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...
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Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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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)
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Related Experiment Video

Updated: Apr 12, 2026

A Method to Study de novo Formation of Chromatin Domains
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Published on: August 23, 2019

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Recruiting polycomb to chromatin.

Ila van Kruijsbergen1, Saartje Hontelez1, Gert Jan C Veenstra1

  • 1Radboud University Nijmegen, Department of Molecular Developmental Biology, Faculty of Science, Radboud Institute for Molecular Life Sciences, Nijmegen 6500 HB, The Netherlands.

The International Journal of Biochemistry & Cell Biology
|May 19, 2015
PubMed
Summary
This summary is machine-generated.

Polycomb Repressive Complex 2 (PRC2) is crucial for cell identity. This review explores how DNA sequence, histone modifications, and RNA guide PRC2 to specific genomic locations for epigenetic silencing.

Keywords:
Chromatin, Transcription regulationCrosstalkEpigeneticsPolycomb

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Area of Science:

  • Epigenetics
  • Molecular Biology
  • Genomics

Background:

  • Polycomb group (PcG) proteins regulate transcriptional repression.
  • Polycomb Repressive Complex 2 (PRC2) is vital for cell differentiation and identity.
  • PRC2 recruitment to genomic targets involves multiple factors.

Purpose of the Study:

  • To review the mechanisms of PRC2 recruitment to specific genomic loci.
  • To discuss the roles of DNA sequence, transcription factors, histone modifications, and RNA in guiding PRC2.
  • To explain how these factors define chromatin states for cell-type-specific epigenetic silencing.

Main Methods:

  • Literature review of epigenetic mechanisms.
  • Analysis of molecular factors influencing PRC2 binding.
  • Discussion of crosstalk between histone modifications and nascent RNA binding.

Main Results:

  • DNA sequence influences DNA methylation, a determinant of PRC2 recruitment.
  • Histone modifications and their crosstalk impact PRC2 binding.
  • Nascent RNA may guide PRC2 by sensing transcriptional status.

Conclusions:

  • A combination of molecular cues dictates local chromatin states for PRC2.
  • Accurate, cell-type-specific epigenetic silencing is controlled by these cues.
  • Understanding PRC2 recruitment is key to epigenetics in development and disease.