TORとSch9による酵母複製寿命の調節は,栄養素への反応として行われる
Matt Kaeberlein1, R Wilson Powers, Kristan K Steffen
1Departments of Genome Sciences and Medicine, University of Washington, Seattle, WA 98195, USA. kaeber@u.washington.edu
まとめ
カロリー制限は酵母菌の寿命を延ばす. 研究者らは,TORとSch9経路の遺伝子を削除すると,長寿も増加することを発見し,これらの経路が栄養感知と老化の鍵であることを示唆しました.
科学分野:
- * 老化と長寿に関する研究
- * 分子生物学と遺伝学
- * イーストはモデル生物として
背景:
- * カロリー制限 (CR) は,様々な生物の寿命を延ばす既知の介入です.
- * CRの作用の基礎となる分子機構を理解することは,ヒトの健康に関する研究にとって極めて重要です.
- *酵母 (Saccharomyces cerevisiae) は,遺伝的処理能力と保存された老化経路により,老化を研究するための強力なモデルとして機能します.
研究 の 目的:
- * 削除された場合,酵母菌の複製寿命を延長する遺伝子を識別する.
- * 酵母菌の長寿における栄養素感知経路,特にラパミシン (TOR) の標的経路とSch9経路の役割を調査する.
- * TORとSch9経路の遺伝子消去によって与えられる寿命の延長がSir2ヒストン脱酸化酵素に依存しているかどうかを判断する.
主な方法:
- * 単一遺伝子消去酵母菌株564の大規模なスクリーニング.
- * 識別されたデレーション変異体における複製寿命の測定.
- *カロリー制限とTOR1,SCH9,SIR2遺伝子の削除を含む遺伝子解析.
主要な成果:
- * イーストの複製寿命を大幅に延長する10の遺伝子削除の特定.
- *これらの寿命を延ばす削除のうち6つは,TORとSch9の栄養素反応経路の構成要素をコードする遺伝子を含む.
- *カロリー制限は,tor1Δまたはsch9Δ変異体の寿命をさらに延長しなかったし,TOR1またはSCH9の削除は,Sir2と独立して寿命を延長した.
結論:
- * TORとSch9キナーゼ経路は,酵母における長寿の重要な調節因子である.
- *これらの経路は,栄養素の摂取が寿命に影響を与える主要なメカニズムとして機能します.
- *TOR1またはSCH9の削除は寿命を延長し,Sir2とは独立して老化プロセスにおけるそれらの役割を強調します.
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