Rev-Erbsは,増強剤向け転写を阻害することによって,マクロファージの遺伝子発現を抑制する
Michael T Y Lam1, Han Cho, Hanna P Lesch
1Department of Cellular and Molecular Medicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, USA.
Nature
|June 4, 2013
まとめ
Rev-Erb核受容体は,増強剤由来RNA (eRNA) の転写を抑制することによって遺伝子発現を調節する. このメカニズムは,細胞特異的な遺伝子抑制を確立し,eRNAを強調します.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝子規制 遺伝子規制
- エピジェネティクス エピジェネティクス
背景:
- Rev-Erb核受容体 (Rev-Erb-αおよびRev-Erb-β) は,昼夜リズム,代謝および炎症のレギュレータとして知られています.
- Rev-Erbsは,遺伝子調節要素をターゲットにコレプレッサー複合体を勧誘することによって,転写抑制剤として機能します.
- Rev-Erbsによる細胞特異的抑制の基礎となる分子機構は不明である.
研究 の 目的:
- マクロファージ特異的な遺伝子発現プログラムにおけるRev-Erbsの役割を調査する.
- Rev-Erbsが転写抑制を媒介するメカニズムを解明する.
- 遺伝子調節における強化剤由来RNA (eRNA) の機能的重要性を決定する.
主な方法:
- マウスマクロファージをモデルシステムとして利用した.
- 改変したグローバル・ランオン・シーケンシング・テクニックを用いて,eRNAの新生5'端を正確にマッピングした.
- 遺伝子発現に対する機能的な影響を評価するために,eRNAの標的を絞った分解を行った.
主要な成果:
- Rev-Erbsは,マクロファージの系統因子によって選択されたディスタルエンハンサーの機能を阻害し,マクロファージ特有の抑制を確立します.
- Rev-Erb媒介抑制は,強化剤由来RNA (eRNA) 転写の抑制と関連しています.
- eRNAの標的化された分解は,近くのメッセンジャーRNAの発現を低下させ,強化機能におけるeRNAの直接的な役割を示している.
- プロモーターへのエンハンサー活性移転には,転写因子結合部位と特定のeRNAエンコーディング配列の両方が必要です.
結論:
- Rev-Erbsは,遠端増強剤でのeRNA転写を阻害することによって,遺伝子発現を抑制します.
- eRNAは,強化剤の機能と遺伝子調節に直接的な役割を果たします.
- これらの発見は,Rev-ErbsとeRNAsによって媒介される細胞特異の遺伝子抑制のための新しいメカニズムを明らかにします.
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