凝縮されたクロマチンは,メソスケール上の固体のように,生体細胞で振る舞う
Hilmar Strickfaden1, Thomas O Tolsma2, Ajit Sharma1
1Department of Oncology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada.
Cell
|December 16, 2020
まとめ
凝縮されたクロマチンは 固体のように振る舞い 外部の力に抵抗します この固体構造は ユカリオットゲノム内の関連タンパク質の 液体のような振る舞いをサポートする.
科学分野:
- 分子生物学
- ゲノミクス
- バイオ物理学
背景:
- DNAとヒストンが形成するクロマチンの構造は,真核生物のゲノム調節に不可欠である.
- 凝縮されたクロマチンの物理的状態を理解することは ゲノム組織と機能を解読する鍵です
研究 の 目的:
- 凝縮されたクロマチンの物理的性質を in vitro と in vivo で調査する.
- 凝縮されたクロマチンは固体のようなか,液体のような振る舞いを表すかどうかを判断する.
- クロマチンの状態と関連するタンパク質の行動の関係を探る.
主な方法:
- 様々な溶液条件下での核細胞配列の自己結合に関するインビトロ研究.
- 生体細胞におけるDNAの移動性を in vivoで測定する.
- ヘテロクロマチンとユークロマチンの行動の観察.
主要な成果:
- In vitroでは,核体配列が固体のような超分子凝縮体を形成した.
- In vivoでは,凝縮されたクロマチンは固体のような振る舞いを示し,DNAの移動性を制限しました.
- ヘテロクロマチンのタンパク質は 固体クロマチンの基板の周りに 溶け合って 液体のような振る舞いを示しました
結論:
- 凝縮されたクロマチンは固体のような状態で存在し,外部の力に抵抗する弾性ゲルとして作用します.
- この固体染色体構造は,染色体結合タンパク質の液体-液体相分離を容易にする.
- クロマチンの固体性は,繊維間の相互作用が限られている場合でも維持されます.
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