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RNA媒介によるRNA分解とカルコン合成酵素Aがペトゥニアの静止作用に作用する
M Metzlaff1, M O'Dell, P D Cluster
1John Innes Centre, Norwich Research Park, Colney, United Kingdom.
Cell
|March 21, 1997
まとめ
転写後のRNAの分解は,異種ペトゥニアのカルコン合成酵素 (CHS) 遺伝子を静止させ,白い花を生成します. これはRNAのペアリングと分裂を伴うもので,内生性およびトランスゲン性CHSRNAの両方に影響を及ぼします.
科学分野:
- 植物分子生物学 植物分子生物学
- 遺伝子規制 遺伝子規制
- RNA 生物学 RNA 生物学
背景:
- カルコン合成酵素 (CHS) は,植物におけるフラボノイド色素の生物合成に不可欠です.
- 転写後の遺伝子サイレンシング (PTGS) は,RNAの分解経路によって起こる可能性があります.
- chsA遺伝子を発現するトランスジェニックペトゥニアは,時にはCHS活動とピグメントの喪失を示します.
研究 の 目的:
- トランスジェニックのペトゥニアのポストトランスクリプション chsA RNA 退廃のメカニズムを調査する.
- CHS遺伝子サイレンシングに関与するRNA領域と構造を特定する.
- CHS発現に影響を与えるPTGSの分子基盤を解明する.
主な方法:
- ポリアデニル化 (ポリアデニル化A) +) と非ポリアデニル化 (ポリアデニル化A) - chsARNAの分析.
- 3'エンド固有のRNA断片を用いたRNA分解アッセイ.
- 配列分析は,chsARNA内の互補性の領域を特定するために行われます.
主要な成果:
- トランスジェニックペトゥニアは,chsA RNAの分解により,CHSの活性が低下し,紫色の色素を示した.
- 静音化された植物では,より短いpoly (A) +とpoly (A) - chsARNAが検出されました.
- 固有のchsAの3'-end-specificRNA断片は分解に抵抗し,補完的な領域にマッピングされた.
結論:
- RNA-RNAペアリングとエンドヌクレオリチス分裂を含むモデルは,CHS RNAの分解を説明する.
- このメカニズムは,ペチュニアのカルコン合成酵素遺伝子のPTGSに寄与する.
- これらのRNA分解経路を理解することは,植物における遺伝子発現を制御する鍵となる.
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