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Nucleosome Remodeling02:54

Nucleosome Remodeling

10.8K
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...
10.8K
Chromatin Packaging01:32

Chromatin Packaging

18.8K
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...
18.8K
Chromatin Packaging02:21

Chromatin Packaging

21.3K
Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter? 
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order...
21.3K
Chromatin Packaging02:21

Chromatin Packaging

9.5K
9.5K
Duplication of Chromatin Structure02:05

Duplication of Chromatin Structure

7.2K
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.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
7.2K
Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

9.3K
The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer...
9.3K

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3D Printing of Biomolecular Models for Research and Pedagogy
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非平衡ポリマーモデルによるクロマチン研究

Giada Forte1, Chris A Brackley1, Nick Gilbert2

  • 1SUPA, School of Physics and Astronomy, University of Edinburgh, Peter Guthrie Tait Road, Edinburgh EH9 3FD, United Kingdom.

Current opinion in genetics & development
|January 9, 2026
PubMed
まとめ
この要約は機械生成です。

転写や複製などの能動的プロセスは、ゲノムを平衡から遠く離れた状態に駆動する。ポリマーモデルは、これらのダイナミクスが染色体編成と核機能をどのように形成するかを明らかにし、従来の実験を超えた新しい洞察を提供する。

キーワード:
アクティブポリマークロマチンダイナミクスゲノム編成核機能非平衡物理学

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Hi-C: A Method to Study the Three-dimensional Architecture of Genomes.
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Author Spotlight: Efficient Nucleosome Reconstitution for Single-Molecule Techniques
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関連する実験動画

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Hi-C: A Method to Study the Three-dimensional Architecture of Genomes.
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Hi-C: A Method to Study the Three-dimensional Architecture of Genomes.

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Author Spotlight: Efficient Nucleosome Reconstitution for Single-Molecule Techniques
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科学分野:

  • 細胞生物学
  • 生物物理学
  • ポリマー物理学

背景:

  • 細胞核は、ATP依存性プロセスによって駆動される動的なシステムである。
  • 転写や複製を含むこれらのプロセスは、ゲノムを熱力学的平衡から遠く離れた状態に維持する。
  • 物理学と細胞生物学を組み合わせた学際的なアプローチは、核のダイナミクスを理解するために不可欠である。

研究 の 目的:

  • 粗視化ポリマーモデルが染色体編成と核機能をどのように照らすかについてのレビュー。
  • ゲノムの空間的および時間的編成を形成する上で能動的プロセスの役割を説明する。
  • これらのモデルのメカニズム的洞察と予測力を強調する。

主な方法:

  • 粗視化ポリマーモデルの適用。
  • 細胞生物学と物理学の原理の統合。
  • 核編成における能動ポリマーモデルに関する既存の文献のレビュー。

主要な成果:

  • ポリマーモデルはエピジェネティック記憶の維持を説明する。
  • モデルは、転写活性とクロマチン運動の間の結合を明らかにする。
  • モデルは、核内での複製ファクトリの出現を解明する。

結論:

  • 能動ポリマーモデルは、核プロセスのメカニズム的理解を提供する。
  • これらのモデルは、実験能力を超えた予測を提供する。
  • 将来の研究は、平衡から遠く離れた能動ポリマーシステムとしてのゲノムに焦点を当てるべきである。