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Related Concept Videos

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...
Nucleosome Remodeling02:54

Nucleosome Remodeling

Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
Chromatin Structure Regulates pre-mRNA Processing02:41

Chromatin Structure Regulates pre-mRNA Processing

In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
The Nucleosome Core Particle01:12

The Nucleosome Core Particle

Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...
The Nucleosome Core Particle02:10

The Nucleosome Core Particle

Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
Position-effect Variegation02:32

Position-effect Variegation

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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Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates
09:13

Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates

Published on: May 12, 2023

Gene regulation by nucleosome positioning.

Lu Bai1, Alexandre V Morozov

  • 1The Rockefeller University, New York, NY, 10065, USA. lbai01@rockefeller.edu

Trends in Genetics : TIG
|September 14, 2010
PubMed
Summary
This summary is machine-generated.

Eukaryotic DNA is compacted into nucleosomes, but regulatory elements require access. Nucleosome positioning creates open regulatory regions and dense transcribed regions, controlling gene transcription and dynamics.

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Last Updated: Jun 8, 2026

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Generation of Native Chromatin Immunoprecipitation Sequencing Libraries for Nucleosome Density Analysis
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Area of Science:

  • Molecular Biology
  • Genetics
  • Epigenetics

Background:

  • Genomic DNA in eukaryotes is highly compacted by nucleosomes.
  • Access to DNA by regulatory factors and transcription machinery is essential for gene expression.
  • A balance exists between DNA compaction and accessibility.

Purpose of the Study:

  • To investigate the role of nucleosome positioning in resolving the conflict between DNA compaction and accessibility.
  • To understand how nucleosome arrangement influences gene regulation.

Main Methods:

  • Analysis of nucleosome occupancy patterns across eukaryotic genomes.
  • Examination of the relationship between nucleosome positioning and regulatory elements (promoters, transcribed regions).

Main Results:

  • Promoters and regulatory sequences are generally nucleosome-depleted.
  • Transcribed regions exhibit well-positioned, high-density nucleosomal arrays.
  • Nucleosome positioning patterns are conserved across eukaryotes.

Conclusions:

  • Specific nucleosome positioning facilitates transcription factor access to regulatory sites.
  • This pattern is crucial for regulating transcription levels, cell-to-cell variability, and gene activation/repression dynamics.