H2A.Zを含む核細胞は,アラビドプシスの熱感受反応を媒介する
S Vinod Kumar1, Philip A Wigge
1John Innes Centre, Colney Lane, Norwich NR4 7UH, UK.
Cell
|January 19, 2010
まとめ
核細胞内の代替ヒストンH2A.Zは,植物が周囲の温度を感知するために不可欠です. DNA-ニュクレオソームの変動を含むこのメカニズムは酵母に保存され,温度に応じて遺伝子発現を調節します.
科学分野:
- 植物分子生物学 植物分子生物学
- エピジェネティクス エピジェネティクス
- 熱感受メカニズムは,熱感受メカニズムです.
背景:
- 植物は,環境温度に対して高い感受性を発揮し,1°Cほどの変化を感知します.
- 温度知覚と植物の発達への統合の基礎となる分子機構は,ほとんど不明のままである.
研究 の 目的:
- アラビドプシスの温度知覚に関与する遺伝的要因を特定する.
- 熱感性における特定のヒストン変数の役割を明らかにする.
主な方法:
- アラビドプシスの遺伝子スクリーンをフォワードして,温度反応が変化した変異体を特定します.
- 核細胞組成の分析,特にヒストンH2A.Z.の組み込みについて.
- 異なった温度条件下での遺伝子発現の変化を評価するためのトランスクリプトーム分析.
- 精製されたヌクレオソームを用いた生物物理学的研究で,DNAとヌクレオソームの相互作用を調査する.
主要な成果:
- H2A.Z核子の組み込みに欠けている変異体は,構成的な暖かい温度トランスクリプトームを示した.
- H2A.Zを含む核細胞は,転写とは無関係に,温度に依存するDNA解封特性を in vitroで実証した.
- H2A.Z核細胞は,周囲の温度トランスクリプトームを調整して,直接的な熱感知情報を提供する.
結論:
- 代替ヒストンH2A.Zを含む核細胞は,植物における正確な環境温度知覚に不可欠である.
- H2A.Z媒介によるDNA解封は,核細胞レベルで温度感知のための直接的なメカニズムを提供します.
- この熱感性メカニズムは進化的に保存されているが,芽生えた酵母菌で観察された同様の効果がそれを証明している.
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