S. cerevisiaeにおける転写サイレンシングとDNA複製における起源認識複合体 (ORC)
M Foss1, F J McNally, P Laurenson
1Department of Molecular and Cellular Biology, University of California, Berkeley 94720.
Science (New York, N.Y.)
|December 17, 1993
まとめ
起源認識複合体 (ORC) は,酵母DNA複製と転写サイレンシングにおいて二重の役割を果たします. ORC2の変異は,両方のプロセスを破壊し,複製の起源と遺伝子の静止機構を結びつける.
科学分野:
- 分子生物学は分子生物学である.
- イースト遺伝学 イースト遺伝学
- エピジェネティクス エピジェネティクス
背景:
- Saccharomyces cerevisiaeのHMR-Eサイレンサーは,タンパク質とDNAの相互作用を阻害することによって,遺伝子発現を調節する.
- サイレンサー機能は,特定の起源でDNA複製の開始と関連しています.
研究 の 目的:
- HMRの場所での転写サイレンシングに関与する遺伝子を特定する.
- DNA複製とサイレンシングにおける特定された遺伝子の役割を明らかにする.
主な方法:
- HMR遺伝子発現に影響を与える突然変異のスクリーニング.
- 特定された遺伝子 (ORC2) の温度感受性突然変異を特徴づける.
- 細胞サイクル進行とプラズミドの安定性を評価する.
主要な成果:
- 起源認識複合体 (ORC) の構成要素をコードする重要な遺伝子であるORC2が特定されました.
- ORC2 (orc2-1) の突然変異により,許容温度で転写静音が破壊されました.
- 制限温度下では,ORC2-1は細胞サイクル停止を引き起こし,プラズミドの損失を増加させ,複製の欠陥を示した.
結論:
- ORCは,染色体DNA複製と転写サイレンシングの両方にとって不可欠です.
- DNA複製開始のメカニズムとエピジェネティックサイレンシングのメカニズムの間に機能的なリンクが存在します.
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