カオロバクテルの細胞分化中に位置情報を発現する
J W Gober1, R Champer, S Reuter
1Department of Developmental Biology, Stanford University School of Medicine, California 94305-5427.
Cell
|January 25, 1991
まとめ
コロバクテルの細胞の非対称性は,異なる子細胞につながります. 特定のフラゲラ遺伝子のmRNAは,上流の規制DNA要素によって駆動され,スワマー細胞に導かれます.
科学分野:
- 細胞および分子生物学
- 微生物学 微生物学とは
- 発達生物学 発達生物学とは
背景:
- Caulobacter crescentusは非対称な細胞分裂を示し,異なった子孫細胞を生成します.
- 異なるタンパク質の局所化は,細胞の多様性を生み出すために不可欠です.
- スエーマー細胞は移動性で,子孫を区別し,ステーク細胞は静止性である.
研究 の 目的:
- カオロバクターにおける非対称的なmRNAターゲティングのメカニズムを調査する.
- 群生細胞へのmRNA分離に責任を負う規制要素を特定する.
- このプロセスが細胞の運命決定にどのように貢献するのかを理解する.
主な方法:
- 転写レポーター遺伝子の融合をフラゲリンおよびフラゲラーフック遺伝子に利用した.
- 予期的なCaulobacter細胞におけるmRNAの局所化を分析した.
- アップストリーム規制シーケンス (ftrとIHF結合部位) の役割を調べました.
主要な成果:
- 鞭状タンパク質をコードするレポーター遺伝子のmRNAは,スワマー細胞の子孫に特異的に分離されています.
- mRNA分離は,mRNA配列ではなく,上流の規制領域に依存しています.
- このmRNA分離には,上流のcis作用要素 (ftrとIHF結合部位) の保存されたセットが関連している.
結論:
- アップストリーム規制要素は,特定のフラゲラーmRNAの非対称なターゲティングを決定する.
- これらの要素は,前科細胞の群れ細胞極における優先転写を容易にする可能性が高い.
- このメカニズムは,Caulobacterの子孫の発達的な分岐に寄与する.
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