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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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The Nucleosome Core Particle01:12

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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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Inheritance of Chromatin Structures03:17

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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...
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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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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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Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.
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Updated: May 12, 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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Native nucleosomes intrinsically encode genome organization principles.

Sangwoo Park1, Raquel Merino-Urteaga2,3, Violetta Karwacki-Neisius2,4

  • 1Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD, USA.

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|May 7, 2025
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Summary
This summary is machine-generated.

Individual nucleosomes possess biophysical properties, termed condensability, that dictate 3D genome organization into A/B compartments. This property correlates with gene expression and is primarily electrostatic, offering insights into chromatin regulation.

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Area of Science:

  • Genomics
  • Biophysics
  • Molecular Biology

Background:

  • The eukaryotic genome is organized into euchromatin (A compartments) and heterochromatin (B compartments) via nucleosomes.
  • The biophysical properties of individual nucleosomes and their role in large-scale genome organization remain incompletely understood.

Purpose of the Study:

  • To investigate if individual nucleosomes contain sufficient information for 3D genome organization into A/B compartments.
  • To determine the biophysical properties, specifically condensability, of mononucleosomes and their relationship with genomic compartments and gene expression.

Main Methods:

  • Purification of native mononucleosomes to high monodispersity.
  • Assessment of nucleosome condensability using physiological concentrations of polyamines.
  • Chromatin polymer simulations incorporating nucleosome condensability as the sole input.
  • Analysis of polyamine depletion effects on nucleosome condensability in mouse T cells.

Main Results:

  • Chromosomal regions in A compartments exhibit low nucleosome condensability, while B compartments show high condensability.
  • Chromatin polymer simulations accurately reproduced A/B compartments using condensability as the only parameter.
  • Nucleosome condensability is strongly anticorrelated with gene expression in a cell type-dependent manner, particularly near promoters.
  • Genome organization principles encoded into nucleosomes are predominantly electrostatic.
  • Polyamine depletion leads to hyperpolarized condensability, accentuating contrast in 3D genome organization.

Conclusions:

  • Mononucleosomes possess intrinsic biophysical properties that dictate 3D genome organization and gene activity.
  • Nucleosome condensability serves as an emergent property, projecting the high-dimensional cellular chromatin state onto a natural axis.
  • The electrostatic nature of nucleosome interactions is a key principle in genome organization, with polyamines playing a crucial role in translating these properties into 3D structure.