サブヌクレオソーム構造と,ゲノム全体のヌクレオソーム非対称性
Ho Sung Rhee1, Alain R Bataille1, Liye Zhang1
1Center for Eukaryotic Gene Regulation, Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802, USA.
Cell
|December 7, 2014
まとめ
この研究は,ChIP-exo.を使用した核細胞内の非対称なヒストンの組織を明らかにしています. 半核細胞を含むこれらの亜核細胞体構造は,遺伝子転写の方向を導く可能性があります.
科学分野:
- 分子生物学は分子生物学である.
- ゲノミクスゲノミクスとは
- エピジェネティクス エピジェネティクス
背景:
- 遺伝子は核体配列に編成され,ヒストンは各核体の核を形成する.
- ヒストンは,さまざまな翻訳後の改変,変異異同型,動的行動を示す.
- 核細胞内の個々のヒストンのコピーの特異的な性質,特に転写方向に関するものは,ほとんど未知のままです.
研究 の 目的:
- ゲノムスケールでの核細胞内の個々のヒストンの組織を調査する.
- 亜核体構造が存在し,転写に関連した方向性を持つかどうかを判断する.
主な方法:
- 染色体免疫降低-外核酶 (ChIP-exo) は,ヒストンの組織を高解像度でマッピングするために使用されました.
- ゲノムDNAを分析して,亜核体構造を特定し,特徴づけました.
主要な成果:
- 半核細胞を含む広範なサブ核細胞構造は,ダイナミックなクロマチンの領域で検出されました.
- ヒストンH3尾とリナーDNAとの相互作用が観察され,潜在的にH3K36メチル化によって調節された.
- ヒストン変種H2A.Zは,1+1核群のプロモーター・ディスタル側での濃縮を示した.
- ヒストンの改変であるH2BK123の普遍化とH3K9のアセチル化が,プロモーター近隣側で濃縮され,転写と相関していた.
結論:
- 発見は,核細胞が均一ではないことを示唆し,異なるヒストンの配列が潜在的に存在する.
- これらのサブヌクレオソームの非対称性は,遺伝子転写のプロセスを指示する分子信号として機能する可能性があります.
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