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コヘシン除去によって明らかになったクロマチンの2つの独立した組織形態
Wibke Schwarzer1, Nezar Abdennur2, Anton Goloborodko3
1Developmental Biology Unit. European Molecular Biology Laboratory. 69117 Heidelberg, Germany.
Nature
|November 3, 2017
まとめ
Nipblを削除すると染色体の折りたたみが再編成され,トポロジカルアソシエイトドメイン (TAD) が消滅するが,ゲノムコンパートメントは保存される. これは,クロマチンの状態に関連したより細かい区画構造を明らかにします.
科学分野:
- ゲノミクス
- エピジェネティクス
- 分子生物学
背景:
- 染色体構成の捕捉は,階層的なゲノム組織をアクティブ/非アクティブコンパートメントとトポロジカルアソシエイトドメイン (TAD) に示す.
- これらの組織層の形成,相互作用,機能的な影響は,まだ完全に理解されていません.
研究 の 目的:
- ゲノム構造の形成におけるコヘシン負荷因子 (Nipbl) の役割を調査する.
- TADs,コンパートメント,および表遺伝的景観の間の関係を明らかにする.
主な方法:
- ネズミの肝臓モデルで ニップル・デリションを使った.
- ゲノム折り合いを分析するために染色体構成捕捉技術 (例えば,Hi-C) を採用した.
- トランスクリプションの変化と表遺伝的景観の評価
主要な成果:
- Nipblの消去は,転写を変化させることなく,TADと関連するHi-Cピークを全般的に除去しました.
- ゲノム区分分離は維持され,さらに強化された.
- TADの喪失は,表遺伝子状態と相関するより細かい区画構造を明らかにした.
結論:
- ゲノム3D組織は2つの異なるメカニズムから生じる:クロマチンの状態によって定義されるコヘシン独立の微細スケールコンパートメント.
- コヘシン依存のTAD形成は,ループエクストルーションによる可能性があり,強化剤-遺伝子相互作用を容易にする.
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