コヘシン複合体は,S. pombeにおける収束遺伝子の間の転写終結を促進する
Monika Gullerova1, Nick J Proudfoot
1Sir William Dunn School of Pathology, University of Oxford, South Parks Rd, Oxford OX1 3RE, UK.
Cell
|March 25, 2008
まとめ
S. pombe の二重鎖RNAは,RNAの干渉とヘテロクロマチン形成を誘発し,コヘシンを招き,さらなるdsRNAの産生を阻害し,転写終了を調節する.
科学分野:
- 分子生物学は分子生物学である.
- エピジェネティクス エピジェネティクス
- 遺伝子規制 遺伝子規制
背景:
- S. pombeの収束遺伝子は,G1期中に重複するトランスクリプトを生成します.
- 二重鎖RNA (dsRNA) は遺伝子調節に関与しています.
研究 の 目的:
- ヘテロクロマチン形成と転写終結におけるdsRNAの役割を調査する.
- dsRNA誘発の表遺伝的変化の文脈におけるコヘシン機能を解明する.
主な方法:
- S. pombe.における転写の分析
- DicerとRITSを用いたRNA干渉 (RNAi) 経路分析.
- ヒストン変異 (H3K9me3) とタンパク質関連性 (Swi6,コヘシン) を検出するためのクロマチン免疫プレシピテーション.
主要な成果:
- dsRNAは,H3K9me3とSwi6.6と共に局所的,RNAi依存のヘテロクロマチンを誘導する.
- コヘシンは,Swi6.6を通じてこれらの異色彩領域に招集されます.
- コヘシンは,G2における収束遺伝子のインタージェニック領域に濃縮され,転写終結を促進し,dsRNA合成を阻害する.
- コヘシンはミトーシスで放出され,新しいサイクルを開始します.
結論:
- コヘシンは,転写終止を調節する上で新しい役割を果たします.
- dsRNA,ヘテロクロマチン,およびその後のコヘシン募集の形成は,規制された転写終結のための広範なメカニズムです.
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