RLIMは,マウスの胚性エピブラストにおけるX染色体の不活性化に欠かせない
JongDae Shin1, Mary C Wallingford2, Judith Gallant3
1Program in Gene Function and Expression, University of Massachusetts Medical School (UMMS), Worcester, Massachusetts 01605, USA.
Nature
|May 30, 2014
まとめ
ユビキチンリガゼRLIMは,雌マウスのランダムなX染色体不活性化 (rXCI) に必要不可欠ではありません. RLIMが欠けている胚細胞はXCIを受け,XistがRLIMから独立したメカニズムで活性化することを示す.
科学分野:
- 遺伝学 遺伝学とは
- 発達生物学 発達生物学とは
- エピジェネティクス エピジェネティクス
背景:
- 2種類のX染色体不活性化 (XCI),インプリント型 (iXCI) とランダム型 (rXCI) がマウスの胚形成中に発生する.
- キシストRNAはXCI形態の両方にとって重要であり,ユビキチンリガゼRLIM (Rnf12) によって活性化されます.
- rXCIにおけるRLIMの役割は,iXCIにとって必要であるにもかかわらず,議論されてきた.
研究 の 目的:
- マウス胚形成中のランダムなX染色体不活性化 (rXCI) でRLIMの役割を調査する.
- rXCIを受けた胚細胞におけるXistの活性化にRLIMが必要かどうかを判断する.
主な方法:
- マウス遺伝子を活用して,インプラント前段階からRLIMが欠けていたメスマウスを作りました.
- XCIの特徴,Xist雲やH3K27me3の焦点を含む胚細胞を分析した.
- RLIMが欠けている細胞の胚生成能力を評価した.
主要な成果:
- RLIMレベルは,rXCIを受けた胚細胞でダウンレギュレーションされていることが判明しました.
- RLIMが欠けていた雌マウスは,Xist雲やH3K27me3発火点などの正常なXCIの特徴を示した.
- これらのRLIM欠乏細胞は,完全な胚生成能力を示した.
結論:
- RLIMはマウスのランダムなX染色体不活性化 (rXCI) プロセスには不要です.
- RLIM独立のメカニズムは,発達中の胚においてXistを活性化させます.
- この発見は,初期の発達におけるXCIを制御する分子経路を明確にします.
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