寒冷誘導性RNA結合タンパク質は,日中の遺伝子発現をポストトランスクリプションで調節する
Jörg Morf1, Guillaume Rey, Kim Schneider
1Department of Molecular Biology, University of Geneva, and National Centre of Competence in Research, Frontiers in Genetics, 30 Quai Ernest Ansermet, CH-1211 Geneva, Switzerland.
まとめ
シミュレートされた体温サイクルは,冷却誘導性RNA結合タンパク質 (CIRP) の発現を調節する. CIRPは,哺乳類の細胞のCLOCKタンパク質のレベルを制御することによって,堅固な昼夜間の遺伝子発現に不可欠です.
科学分野:
- 分子生物学は分子生物学である.
- クロノバイオロジーはクロノバイオロジーを用います.
- 遺伝学 遺伝学とは
背景:
- 哺乳類における日経周期的な遺伝子発現は,上下神経核のマスターペースメーカーと局所振動器によって影響を受けます.
- シルカディアンリズムを媒介する特定のタンパク質の役割については,さらなる解明が必要である.
研究 の 目的:
- 寒冷誘導性RNA結合タンパク質 (CIRP) が昼間遺伝子発現を調節する役割を調査する.
- CIRPが昼夜リズムに影響を与える分子メカニズムを特定する.
主な方法:
- 体温サイクルのシミュレーションは,培養された線維芽細胞における遺伝子発現を制御するために使用されました.
- 機能喪失の実験では,昼間の遺伝子発現に対するCIRPの必要性を評価した.
- バイオチン-ストレプトアビジンベースのクロスリンクと免疫降水 (CLIP) は,CIRP結合RNAを特定しました.
- ウエスタン・ブロッティングと子宮外発現の研究では,CLOCKタンパク質のレベルと機能を分析した.
主要な成果:
- 外周振動器ではなく,体温サイクルをシミュレートすることで,線維芽細胞のリズム的なCIRP発現を誘導した.
- CIRPの機能喪失により,高振幅の昼夜性遺伝子発現に障害が生じます.
- CLIPは,CIRP.によって結合されたCLOCKを含む,昼間振動器タンパク質をコードするトランスクリプトを特定しました.
- CIRPの枯渇は,CLOCKの蓄積を大幅に減らし,子宮の外表は昼間の遺伝子発現を回復しました.
結論:
- CIRPは,昼間の遺伝子発現幅の重要なレギュラーである.
- CIRPは,CLOCK表現を調節することによって,昼間振動器に強度を与える.
- CIRPは,気温サイクルの下流で,CLOCKの上流で,昼夜リズムを維持するために作用します.
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