BANPはクロマチンを開き,CpG島を調節する遺伝子を活性化します
Ralph S Grand1, Lukas Burger1,2, Cathrin Gräwe3
1Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland.
Nature
|July 8, 2021
まとめ
研究者はBTG3関連核タンパク質 (BANP) をCpG島プロモーターの重要な転写因子として特定した. BANPは重要な遺伝子を活性化し,その結合はDNAメチル化によって調節され,クロマチンの構造に影響を与えます.
科学分野:
- ゲノミクス
- エピジェネティクス
- 分子生物学
背景:
- CpG島 (CGI) プロモーターは,哺乳類におけるRNAポリメラーゼII転写の主要な部位である.
- CGIプロモーターの調節は,転写因子とその機能的結合部位に関する知識が不完全であるため,十分に理解されていません.
- CGCG要素のような孤児モチーフは,活性プロモーターの近くに見つかりますが,その結合因子は不明です.
研究 の 目的:
- CGCG要素を結合する転写因子を特定する.
- CGI プロモーターにおける遺伝子発現の調節におけるこの転写因子の役割を明らかにする.
- DNAメチル化が転写因子結合とクロマチンの構造にどのように影響するかを理解する.
主な方法:
- 単一分子足跡と相互作用プロテオミクスを組み合わせた
- 転写因子結合を in vitro と in vivo で研究した.
- 染色体のアクセシビリティと,転写因子結合時の核細胞相化を分析した.
主要な成果:
- BTG3関連核タンパク質 (BANP) をCGCG要素を結合する転写因子として特定した.
- BANPはCGIプロモーターの強力なアクティベーターであり,幹細胞とニューロンの重要な代謝遺伝子を制御します.
- BANP結合はDNAメチル化によって抑制され,その機能は非メチル化CGIに限定される.
- BANPが非メチル化モチーフに結合すると,クロマチンの開きと核細胞のフェージングが起こります.
結論:
- BANPはCGIプロモーターによって調節される重要な遺伝子の活性化剤です.
- CGIプロモーターの活動は,クロマチンを開くことができるBANPのようなメチレーションに敏感な転写因子に依存しています.
- DNAメチル化は,BANP結合を表遺伝的に制御し,正常な細胞と癌細胞の遺伝子調節に影響を与えます.
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