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Related Concept Videos

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. 
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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.
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DNA in a human cell is almost 2m long and it is packed inside a tiny nucleus that is only a few microns in diameter. The level of compaction of DNA inside the nucleus is astonishing. It is organized into several sequentially higher levels of compaction to fit into such a tiny space. The most compact form of DNA is a chromosome that can be seen under a microscope in a dividing cell.
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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.
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Related Experiment Video

Updated: Dec 13, 2025

Assembly of Nucleosomal Arrays from Recombinant Core Histones and Nucleosome Positioning DNA
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Assembly of Nucleosomal Arrays from Recombinant Core Histones and Nucleosome Positioning DNA

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Nucleosome positioning and chromatin organization.

Jyotsana J Parmar1, Ranjith Padinhateeri1

  • 1Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Mumbai 400 076, India.

Current Opinion in Structural Biology
|July 31, 2020
PubMed
Summary

Chromatin organization arises from nucleosome positioning and interactions, forming dynamic 3D domains. This complex structure emerges from heterogeneous nucleosome arrangements and varied inter-nucleosome connections over time.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • DNA is packaged into chromatin, with nucleosomes as the basic unit (DNA wrapped around histone proteins).
  • Chromatin exhibits dynamic, multi-layered organization, with its complex structure emerging from protein-DNA interactions.
  • Understanding the mechanisms driving chromatin organization is a key area of biological research.

Purpose of the Study:

  • To review recent literature on how nucleosome positioning and interactions influence chromatin organization.
  • To explore the formation of 3D chromatin domains and the factors contributing to their structure.

Main Methods:

  • Literature review of studies investigating nucleosome positioning.
  • Analysis of research on nucleosome-mediated interactions and their role in chromatin structure.
  • Synthesis of findings on the dynamic organization of chromatin.

Main Results:

  • Chromatin is organized into 3D domains of varying sizes.
  • Nucleosomes within these domains are irregularly positioned.
  • Heterogeneous nucleosome positioning and diverse inter-nucleosome interactions drive domain formation.

Conclusions:

  • Chromatin organization is not static but dynamic, with 3D domains emerging from complex nucleosome arrangements.
  • Inter-nucleosome interactions are spatially and temporally variable, contributing to the heterogeneity of chromatin structure.
  • Recent findings challenge earlier understandings of chromatin organization, highlighting the importance of nucleosome dynamics.