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Related Concept Videos

Chromatin Packaging01:32

Chromatin Packaging

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Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...
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Nucleosome Remodeling02:54

Nucleosome Remodeling

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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.
Nucleosome remodeling complex
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The Nucleosome01:19

The Nucleosome

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Human DNA is almost two meters long. However, it is compressed inside a tiny nucleus measuring only a few microns in diameter. To make this degree of compaction possible, DNA is organized into several sequential levels so that it can 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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Duplication of Chromatin Structure02:05

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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.
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The Nucleosome Core Particle01:12

The Nucleosome Core Particle

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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.
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...
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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: Jun 3, 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 Spacing Can Fine-Tune Higher Order Chromatin Assembly.

Lifeng Chen1,2, M Julia Maristany3,4,5,2,6, Stephen E Farr3,6

  • 1Department of Biophysics and Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.

Biorxiv : the Preprint Server for Biology
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Summary
This summary is machine-generated.

Nucleosome spacing controls chromatin organization via phase separation. Longer DNA linkers decrease stability and increase mobility, impacting nuclear processes.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Genomics

Background:

  • Cellular chromatin exhibits complex structure and dynamics crucial for nuclear functions.
  • Phase separation of chromatin fibers is a proposed mechanism for regulating chromatin organization in vivo.
  • Understanding the factors influencing chromatin phase separation is key to deciphering nuclear processes.

Purpose of the Study:

  • To investigate the role of nucleosome spacing in controlling chromatin phase separation at single base-pair resolution.
  • To elucidate the biophysical mechanisms underlying the relationship between DNA linker length and chromatin condensate stability.
  • To explore how chromatin remodelers modulate chromatin phase separation dynamics.

Main Methods:

  • Biochemical assays to study chromatin structure and interactions.
  • Molecular dynamics simulations at single base-pair resolution.
  • Analysis of thermodynamic stability and nucleosome mobility within chromatin condensates.

Main Results:

  • Extending DNA linkers from 25 bp to 30 bp (10N+5 and 10N lengths) reduces chromatin condensate stability and increases nucleosome mobility.
  • This modulation is attributed to a balance between inter- and intramolecular nucleosome stacking, influenced by linker rigidity.
  • Chromatin remodelers can alter phase separation by repositioning nucleosomes, thereby shifting the stacking balance.

Conclusions:

  • Nucleosome spacing is a critical determinant of chromatin phase separation and organization in vivo.
  • The intrinsic phase separation capacity of chromatin allows for dynamic regulation of compaction and mobility.
  • These findings provide insights into the mechanisms maintaining heterogeneous chromatin organization within the cell nucleus.