遺伝子規制における情報統合とエネルギー支出
Javier Estrada1, Felix Wong2, Angela DePace1
1Department of Systems Biology, Harvard Medical School, Boston, MA 02115, USA.
Cell
|July 2, 2016
まとめ
細菌モデルでは,真核生物の鋭い遺伝子発現を説明できない. 精密な遺伝子調節を実現し 理論上の障壁を克服する鍵となるのは DNA結合だけではなく エネルギー消費です
科学分野:
- 分子生物学
- バイオ物理学
- システム生物学
背景:
- 定量的な遺伝子調節モデルは主に細菌系から来ている.
- 既存のモデルは,転写因子 (TF) に反応する発達遺伝子の鋭い発現パターンを説明するのに苦労しています.
研究 の 目的:
- ユカリオットにおける鋭い遺伝子発現を制御する物理的原理を調査する.
- 細菌の調節パラダイムが真核生物の遺伝子発現のダイナミクスを説明できるかどうかを判断する.
- 単純なTF結合を超えて精密な遺伝子発現制御を達成するためのメカニズムを探求する.
主な方法:
- 物理学の原理に基づいた理論的モデルです
- 複数の転写因子結合部位における情報統合の分析
- 調節性DNAダイナミクスにおける熱力学的均衡とエネルギー消費 (運動的校正) の検討
主要な成果:
- 細菌のパラダイムは,真核生物における鋭い遺伝子発現を説明するのに不十分である.
- 情報の統合は鋭さを高めることができますが",ホップフィールドの障壁" (ヒル係数に関連する) によって制限されます.
- エネルギー消費は 運動校正のようなメカニズムで この障壁を乗り越え より鋭い表現が得られます
結論:
- ユカリオットの遺伝子調節には,均衡ベースのTF結合を超えたメカニズムが必要です.
- 発達に必要な精密な遺伝子発現を実現するには エネルギー依存のプロセスが不可欠です
- 物理学の原理を組み込んだ,真核生物の遺伝子調節のための新しい定量的な枠組みが提案されています.
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