wee1タンパク質キナーゼは,放射線によって誘発されたミトーシス遅延のために必要です
R Rowley1, J Hudson, P G Young
1Department of Radiology, University of Utah Medical Center, Salt Lake City 84132.
Nature
|March 26, 1992
まとめ
細胞サイクルチェックポイントは,適切な細胞機能を保証します. 分裂酵母では,DNA損傷は,DNA合成が阻害されたときに使用されるcdc25経路とは異なるwee1経由でミトーシス遅延を引き起こします.
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:
- 細胞サイクルチェックポイントは,ゲノムの安定性を維持し,細胞イベントの正しい順序を確保するために不可欠です.
- 芽生えた酵母では,RAD9はDNA損傷に対する反応の遅延を媒介する.
- 核分裂酵母では,cdc25とcdc2は,DNA合成が抑制されたときにミトスの遅延に影響を与えます.
研究 の 目的:
- 核分裂酵母におけるDNA損傷応答とDNA合成阻害経路の間に,ミトーシス遅延に関与する細胞周期調節要素が保存されているかどうかを調査する.
- ガンマ放射線によって誘発されるミトシス遅延における wee1 と cdc25 の特定の役割を決定する.
主な方法:
- ガンマ放射線を用いて,分裂酵母におけるDNA損傷を誘導する.
- ガンマ放射線への反応として細胞サイクル進行をモニタリングする.
- 観察されたミトシス遅延における特定の遺伝子産物 (wee1, cdc25) の関与を評価する.
主要な成果:
- ガンマ放射線によって誘発された分裂酵母におけるミトス遅延には,機能的な wee1 タンパク質キナーゼが必要です.
- ガンマ放射線によって引き起こされるミトシス遅延は,cdc25経路を関与していないようです.
- 逆に,DNA合成の阻害によるミトシス遅延は,cdc25を伴うが,wee1.1とは独立している.
結論:
- DNA損傷に対する反応におけるミトス遅延を制御するメカニズムは,分裂酵母におけるDNA合成阻害に反応するメカニズムとは異なる.
- wee1はDNA損傷によるミトシス遅延の重要な調節体であり,cdc25は抑制されたDNA合成によって引き起こされる遅延に不可欠である.
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