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Quantification of γH2AX Foci in Response to Ionising Radiation
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H2AXのチロシン脱リン酸化は,アポプトシスと生存決定を調節する
Peter J Cook1, Bong Gun Ju, Francesca Telese
1Howard Hughes Medical Institute School of Medicine, University of California, San Diego, California 92037, USA.
Nature
|February 24, 2009
まとめ
タンパク質チロシンフォスファタゼEYAは,遺伝子毒性ストレス後のアポトーシスよりもDNA修復を促進します. ヒストンH2AX (Y142) を脱酸化し,哺乳類のオルガノゲネシス中に細胞の運命決定に影響を与えます.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- アポトーシスや生存などの細胞の運命決定は,遺伝子毒性ストレスに対する重要な反応です.
- DNA修復とアポトーシスの経路は知られているが,細胞の運命を決定する分子機構は不明である.
- H2AX (ガンマ-H2AX) のリン酸化のようなヒストンの改変は,DNA損傷の主要なマーカーである.
研究 の 目的:
- 遺伝子毒性ストレス後の細胞の運命決定を制御する分子機構を調査する.
- DNA修復とアポトーシスの間のバランスに関与する新しい調節体を特定する.
- DNA損傷への反応におけるタンパク質チロシンフォスファタゼEYAの役割を解明する.
主な方法:
- 使用された哺乳類の胚性腎臓細胞.
- 遺伝子毒性ストレスへの反応におけるタンパク質チロシンフォスファタゼEYAの役割を調査した.
- 分析されたダメージシグナル依存のH2AXのY142.2.における脱酸化.
- Gamma-H2AXにDNA修復およびプロアポプトティック要因の採用を評価した.
主要な成果:
- タンパク質チロシンフォスファタゼEYAはDNA修復を促進し,遺伝子毒性ストレス後のアポプトシスを抑制します.
- EYAは,Y142.2.でH2AXのダメージシグナル依存の脱酸化を実行します.
- この脱酸化は,ガンマ-H2AX.へのDNA修復またはプロアポプトティック要因の徴募に影響します.
- H2AXのリン酸化状態は,修復/生存とアポプトシスの結果の決定因子として作用します.
結論:
- EYAは,DNA損傷後の細胞の運命決定を調節する上で重要な役割を果たします.
- EYAによるH2AX (Y142) の脱酸化は,細胞生存またはアポトーシスを決定する重要な翻訳後の修正である.
- このメカニズムは,哺乳類のオルガノゲネシス中に細胞運命を調節する新しいリン酸化依存の経路を明らかにします.
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