hCAS/CSE1Lはクロマチンと結合し,特定のp53標的遺伝子の発現を調節する
Tomoaki Tanaka1, Shuichi Ohkubo, Ichiro Tatsuno
1Department of Biological Sciences, Columbia University, New York, NY 10027, USA.
Cell
|August 28, 2007
まとめ
人間の細胞アポトーシス感受性タンパク質 (hCAS/CSE1L) は,特定の遺伝子プロモーターと結合し,p53媒介の転写とアポトーシスなどの細胞結果に影響を与えます. そのダウンレギュレーションは遺伝子発現とヒストンのメチル化に影響します.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- エピジェネティクス エピジェネティクス
背景:
- p53腫瘍抑制タンパク質は,成長停止とアポトーシスを含む細胞運命を決定する遺伝子を制御します.
- p53によるプロモーター選択的トランザクティベーションは,これらの結果にとって不可欠ですが,依然として十分に理解されていません.
- p53標的遺伝子の活性を調節する因子を理解することは,細胞の反応を解読する鍵です.
研究 の 目的:
- ヒトの細胞アポトーシス感受性タンパク質 (hCAS/CSE1L) がp53媒介遺伝子調節における役割を調査する.
- hCAS/CSE1Lがp53標的プロモーターと結合し,その転写に影響を与えるかどうかを判断する.
- hCAS/CSE1Lの結合が細胞のアウトカムや表遺伝的変異に及ぼす機能的影響を明らかにする.
主な方法:
- PIG3.3を含むp53標的遺伝子プロモーターとhCAS/CSE1Lの関連性を調査しました.
- hCAS/CSE1Lのダウンレギュレーションが遺伝子転写とアポトーシス率に与える影響を評価した.
- hCAS/CSE1Lサイレンシング後のヒストンメチル化パターン,特にH3K27メチル化の変化を分析した.
主要な成果:
- hCAS/CSE1Lは,p53の標的プロモーターのサブセット,例えばPIG3と,p53とは無関係に結合することが判明しました.
- hCAS/CSE1L濃度の低下は,好ましい標的プロモーターの転写が低下し,アポトーシスの減少につながった.
- hCAS/CSE1Lを静止すると,PIG3遺伝子の位置でヒストンH3リジン27のメチル化が増加した.
結論:
- 人間のCAS/CSE1Lは,特定の遺伝子を結合するクロマチン関連タンパク質として機能します.
- hCAS/CSE1Lは,p53媒介の転写と細胞アウトカムの決定において重要な役割を果たしています.
- 核-細胞質輸送因子hCAS/CSE1Lは,プロモーター結合と表遺伝的修正を通じて遺伝子発現に影響を与えます.
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