C. elegansにおけるトランススプライシングは,負のRNAiレギュレータ ERI-6/7を生成する
Sylvia E J Fischer1, Maurice D Butler, Qi Pan
1Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts 02114, USA.
Nature
|September 12, 2008
まとめ
研究者は,Caenorhabditis elegansのeri-6およびeri-7遺伝子の変異を特定し,新しいRNAi経路調節体を明らかにしました. このヘリカーゼタンパク質は,外因的および内因的なRNA干渉経路の両方を制御します.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- RNA 生物学 RNA 生物学
背景:
- RNA干渉 (RNAi) 経路は,遺伝子発現を調節するために小さなRNAを使用します.
- RNAiコンポーネントに影響する突然変異は,経路の相互作用と規制メカニズムを明らかにすることができます.
研究 の 目的:
- Caenorhabditis elegansにおける小さなRNA経路の新たなレギュレータを特定する.
- RNA干渉に関与する新発見の遺伝子の機能を調査する.
主な方法:
- 二重鎖RNA (dsRNA) に対する反応が強化されたCaenorhabditis elegans変異体に対するスクリーニング.
- エリ-6とエリ-7の変異を特定するための遺伝的補完分析.
- トランススプライシングおよびアデノシンからイノシンへの編集を含むプレメッセンジャーRNA (pre-mRNA) 処理の分析.
- 超ファミリーIヘリケーズであるERI-6/7タンパク質の特徴.
主要な成果:
- 2つの隣接し,異なった転写遺伝子であるeri-6とeri-7の突然変異の分離.
- エリ-6とエリ-7がトランススプライシングによって単一の機能mRNA (エリ-6/7) を形成するという発見.
- スプライシング前にアデノシンからイノシンへの編集によって形成された二重鎖のプレ-mRNA中間物質の証拠.
- ヘリカーゼであるERI-6/7タンパク質は,外来RNAiを否定的に調節し,内在RNAiに参加する.
結論:
- エリ-6/7遺伝子ロクスは,RNA干渉経路の重要なレギュレータをコードする.
- 核前mRNAの編集とトランススプライシングは,eri-6/7 mRNAの成熟の重要なステップです.
- ERI-6/7ヘリケーゼは,外来RNAiと自己由来RNAiの両方を制御する二重の役割を果たします.
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