根のパターニングにおける推定転写因子SHRの細胞間移動
1Department of Biology, New York University, New York, New York 10003, USA.
Nature
|September 21, 2001
まとめ
短根タンパク質 (SHR) は,ステル細胞から隣接する細胞へと移動し,植物の根の発達を調節する. このシグナル伝達は,細胞分裂に不可欠であり,アラビドプシスの内皮細胞の運命を決定する.
科学分野:
- 植物生物学 植物生物学
- 発達生物学 発達生物学とは
- 遺伝学 遺伝学とは
背景:
- 植物の発達は位置情報に依存しているが,信号伝達機構は十分に理解されていない.
- アラビドプシスの根の放射状のパターンは,細胞分裂と宿命獲得によって形成されます.
- ショートルート (shr) ミュータントは,皮質/内皮質の発達と内皮質の特異性において欠陥を示す.
研究 の 目的:
- アラビドプシスの根の発達における短根 (SHR) 遺伝子とそのタンパク質産物の役割を調査する.
- 植物根の細胞運命を決定する信号機構を明らかにする.
主な方法:
- 開発上の欠陥を観察するために,縮小変異体の分析.
- SHR mRNAとタンパク質の局所化研究.
- SCARECROW (SCR) プロモーターを用いた子宮外表現実験.
主要な成果:
- SHRタンパク質は,ステル細胞から隣接する細胞に非細胞自律的に移動し,核に入ります.
- エクトピックSHR発現は,オートカタリティックシグナル伝達,細胞運命を変化させ,細胞層を増加させます.
- SHRは,内皮質の特異化と皮質/内皮質の初期子細胞分裂に不可欠です.
結論:
- SHRタンパク質は,ステルから発する移動信号として作用します.
- SHRは,内皮細胞の運命とSCR媒介の細胞分裂を活性化する重要な調節因子です.
- SHRが信号と発達経路の誘導体の両方として機能するモデルが提案されています.
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