IME1は,S. cerevisiaeのメオシスの陽性調節遺伝子である
Cell
|March 25, 1988
まとめ
メイオシス誘導因子1 (IME1) 遺伝子は酵母菌のメイオシスを正面に調節する. その発現は,RME1とグルコースのような環境要因によって抑制されるが,特定の酵母菌株の窒素飢餓によって誘発される.
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
- セルラーレギュレーション セルラーレギュレーション
背景:
- メイオシスは,真核生物における性繁殖の根本的なプロセスである.
- 分離性の遺伝的調節を理解することは,細胞生物学の研究にとって極めて重要です.
- 以前の研究では,IME1がメオティック開始に影響を与える遺伝子として特定されました.
研究 の 目的:
- IME1の遺伝子発現を制御する規制メカニズムを解明する.
- 介質経路の開始におけるIME1の役割を調査する.
- IME1の活動に影響を与える環境的および遺伝的要因を特定する.
主な方法:
- 遺伝子クローニングとIME1機能の分析.
- IME1の破壊と,その結果生じる現象型 (Spo-) の分析.
- 変異 (ime1-0,rme1-1) がメオシスに及ぼす影響を調査する.
- 異なる成長条件 (グルコース,アセテート,窒素飢餓) の下でのIME1トランスクリプトレベルを評価する.
主要な成果:
- IME1はマイオシスのポジティブレギュレータとして作用し,MATの不十分な株がメオシスプロセスを経ることを可能にします.
- IME1の障害は,後退性運動欠乏性 (Spo-) フェノタイプにつながります.
- IME1はRME1によって抑制され,RME1はMATA1およびMATAα2遺伝子製品によって抑制されます.
- IME1の転写は環境によって調節され,グルコース培養細胞では転写が検出されず,アセテット培養細胞では誘発されます.
- 窒素飢餓はさらに,特定の二倍性菌株 (MATa/MATαまたはrme1-1/rme1-1) でのIME1転写 (6〜8倍) を誘導する.
- マルチコピープラズミッドを使用したIME1の過剰発現は,リッチメディアでも胞子化を促進します.
結論:
- IME1は酵母におけるメオシスの重要な陽性調節体である.
- IME1の発現は,遺伝子 (RME1,交配型遺伝子) と環境要因 (栄養素の利用可能性) によって厳しく制御されます.
- 栄養素の利用可能性などの環境的シグナルは,IME1規制を通じてメオティックプログラムを起動する上で重要な役割を果たします.
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