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ダイナミック・ランドスケープと哺乳類におけるRNA編集の調節
Meng How Tan1,2,3, Qin Li1, Raghuvaran Shanmugam2,3
1Department of Genetics, Stanford University School of Medicine, Stanford, California 94305, USA.
Nature
|October 13, 2017
まとめ
アデノシンからイノシン (A-to-I) のRNA編集パターンは,組織と種間でダイナミックであり,ADAR酵素やAIMP2のような新しい調節体を明らかにします. この研究は RNA編集の複雑なシス・トランス・レギュレーションを明らかにしています
科学分野:
- 分子生物学
- 遺伝学
- バイオ情報学
背景:
- ADAR酵素によって媒介されるアデノシンからイノシン (A-to-I) のRNA編集は,トランスクリプトームを多様化しますが,その調節と範囲は完全に理解されていません.
- 以前の研究では多数の編集部が特定されたが,多様な生物学的文脈と種を巡る包括的な分析は欠けていた.
研究 の 目的:
- 様々なヒト組織,霊長類,マウスのA-to-IRNA編集パターンを包括的にプロファイルする.
- 新規のレギュレータを特定し,RNA編集のダイナミクスの cis 及び trans 制御を理解する.
- ADAR1,ADAR2,ADAR3が異なるゲノム環境や種で果たす役割を調査する.
主な方法:
- 8,551人のサンプル (GTExプロジェクト) と数百人の霊長類とマウスのサンプルでのA-to-IRNA編集の広範なプロファイリング.
- 規制メカニズム (cis- vs. trans-) を決定するための組織と種間の編集レベルの比較分析.
- 大規模なゲノムデータを用いてADAR酵素標的と潜在的なレギュレータの特定とキュレーション.
主要な成果:
- コード領域での編集レベルは,繰り返し領域よりもヒト組織間でより大きく変化した.
- ADAR1は主に重複するサイトを編集し,ADAR2は重複しないコーディングサイトを編集し,ADAR3は編集を阻害します.
- 組織型ではなく,種が編集レベルの主な決定因子であり,ほとんどのサイトで強いシス調節を示した.
- ADAR酵素による編集部位の組織特有の調節が観察され,AIMP2は筋肉における編集を減少させる潜在的な調節因子として特定された.
結論:
- A-to-I RNA編集は,ダイナミックな時空パターンと複雑なシスおよびトランス調節メカニズムを示しています.
- ADAR酵素は,ADAR3が阻害剤として作用する,繰り返しおよびコーディング領域の編集に明確な役割を果たします.
- 種特有の違いと組織特有の調節は,RNA編集の複雑な制御をインビボで強調しています.
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