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系統遺伝的保存と分岐のパターンを用いて小RNA経路遺伝子の識別
Yuval Tabach1, Allison C Billi, Gabriel D Hayes
1Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts 02114, USA.
Nature
|February 1, 2013
まとめ
研究者は,真核生物のゲノムを分析することによって,RNA干渉 (RNAi) とmicroRNA (miRNA) 経路に不可欠な新しいタンパク質を特定しました. 新しく発見された多くの小さなRNA経路のコファクターは,RNAスプライシングと関連しており,これらのプロセスの間の深いつながりを示唆しています.
科学分野:
- ゲノミクスと分子生物学
- バイオインフォマティクスと計算生物学
- ユーカリオットの遺伝子規制
背景:
- RNA干渉 (RNAi) とマイクロRNA (miRNA) 経路は,小さなRNA処理と標的認識のために,アルゴナウトとディサーのような重要なコファクターを利用します.
- これらの小さなRNA経路のコファクターは,ユカリオット全体で多様な進化的保存パターンを表しており,その機能的重要性を反映しています.
研究 の 目的:
- 小型RNA経路に関与する新種のタンパク質を,86の異なる真核ゲノムにおける系統遺伝的プロフィールを比較することによって識別する.
- 系統遺伝データを転写情報とタンパク質情報と統合して,候補小RNA経路タンパク質を予測する.
主な方法:
- 86の真核生物ゲノムの比較ゲノミクス分析により,既知の小さなRNAコファクターに類似する系統遺伝的プロファイルを持つタンパク質を特定しました.
- 系統遺伝プロファイルの分析とベイジアン推論,トランスクリプションコレグレーション,およびタンパク質相互作用データとの統合.
- モデル生物におけるRNAiサイレンシングアッセイによる高信頼性候補タンパク質の機能的検証.
主要な成果:
- 候補小型のRNA経路のコファクターの大量のセットを特定し,その多くは既知のタンパク質に似た系統遺伝的プロファイルを示しています.
- 機能的スクリーニングは,予測された小さなRNAコファクターの約半分がRNAiサイレンシングに不可欠であることを確認しました.
- 新しく特定された多くのタンパク質はRNAスプライシング因子にオートロゴスであり,スプライシングと小RNA経路の関連性を示しています.
結論:
- この研究は,小さなRNA経路に関与する多数の新しいタンパク質を成功裏に特定し,遺伝子サイレンスメカニズムについての理解を広げました.
- RNAスプライシング機構と小RNA媒介による遺伝子サイレンシングの間に,アルゴナウトタンパク質,小RNA成分,種間のイントロンの存在との相関関係によって支持される重要な関連性があります.
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