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The Nucleosome01:19

The Nucleosome

1.2K
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.
In a chromosome, DNA is wound twice around a protein complex called a histone octamer core, which consists of 8 histone proteins. This...
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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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Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

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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...
6.2K
Chromatin Packaging01:32

Chromatin Packaging

16.5K
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...
16.5K
Nucleosome Remodeling02:54

Nucleosome Remodeling

8.8K
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...
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Genomic DNA in Eukaryotes00:58

Genomic DNA in Eukaryotes

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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

Published on: September 10, 2013

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ネイティブ・ヌクレオソームは本質的にゲノム組織原理をコードする.

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.

Nature
|May 7, 2025
PubMed
まとめ
この要約は機械生成です。

個々のヌクレオソームは,A/Bコンパートメントに 3Dゲノム組織を決定する,凝縮性と呼ばれる生体物理的特性を有する. この性質は遺伝子発現と相関しており,主に静電性であり,クロマチンの調節に関する洞察を提供します.

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Author Spotlight: Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates
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Deciphering Molecular Mechanism of Histone Assembly by DNA Curtain Technique
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Deciphering Molecular Mechanism of Histone Assembly by DNA Curtain Technique

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関連する実験動画

Last 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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Author Spotlight: Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates
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Deciphering Molecular Mechanism of Histone Assembly by DNA Curtain Technique
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科学分野:

  • ゲノミクス
  • バイオ物理学
  • 分子生物学

背景:

  • ユカリオットのゲノムは,ニュクレオソームを通じてユークロマチン (A区) とヘテロクロマチン (B区) に編成されている.
  • 個々のヌクレオソームの生体物理的性質と,大規模なゲノム組織におけるその役割は,まだ完全に理解されていません.

研究 の 目的:

  • 個々の核細胞がA/B区画に 3Dゲノム組織化のための十分な情報を含んでいるかどうかを調査する.
  • モノヌクレオソームの生体物理的特性,特に凝縮性,ゲノムコンパートメントと遺伝子発現との関係を決定する.

主な方法:

  • ネイティブ・モノヌクレオソームを高単分散に浄化する.
  • ポリアミンの生理学的濃度を用いた核細胞凝縮性の評価
  • クロマチンポリマーシミュレーションは,核粒子の凝縮性を唯一の入力として組み込む.
  • マウスT細胞における核細胞凝縮性に対するポリアミン減少効果の分析.

主要な成果:

  • A区画の染色体領域は核細胞凝縮性が低く,B区画は凝縮性が高い.
  • クロマチンポリマーシミュレーションは,コンデンサビリティを唯一のパラメータとして使用してA/Bコンパートメントを正確に再現した.
  • 細胞型に依存した方法で,特にプロモーターの近くでの遺伝子発現と強く反相関しています.
  • 核細胞にコード化されたゲノム組織原理は,主に静電的なものです.
  • ポリアミンの枯渇は高極化コンデンサビリティにつながり,3Dゲノム組織におけるコントラストを強調します

結論:

  • モノヌクレオソームは3Dゲノム組織と遺伝子活動を決定する 本質的な生体物理的特性を有しています
  • 核粒子の凝縮性は,高次元細胞クロマチンの状態を自然軸に投影する新興特性として機能する.
  • ニュクレオソームの相互作用の静電性はゲノム組織における重要な原理であり,ポリアミンはこれらの性質を3D構造に変換する上で重要な役割を果たしています.