反対のマイクロRNAファミリーは,マウスの胚性幹細胞の自己再生を調節する
Collin Melton1, Robert L Judson, Robert Blelloch
1The Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, Center for Reproductive Sciences, Program in Biomedical Sciences, University of California San Francisco, San Francisco, California 94143, USA.
Nature
|January 8, 2010
まとめ
マイクロRNAは細胞の運命を調節する. Let-7のmiRNAは,DGCR8が欠けている胚性幹細胞の自己再生を抑制し,ESC特異のmiRNAはそれを促進し,細胞の分化における重要なメカニズムを明らかにする.
科学分野:
- 発達生物学 発達生物学について
- 分子生物学は分子生物学である.
- 幹細胞生物学 幹細胞生物学
背景:
- 胚性幹細胞 (ESC) は,自己再生を沈黙させ,分化中に組織特有のプログラムを活性化しなければなりません.
- DGCR8は,マイクロRNA (miRNA) バイオゲネシスに不可欠であり,その欠如は,ESCが自己更新を沈黙させることを妨げます.
研究 の 目的:
- ESCの自己再生と分化を調節するレット-7ミRNAとESC細胞周期調節ミRNAの役割を調査する.
- これらのmiRNAファミリーが細胞運命を制御する分子経路を解明する.
主な方法:
- マウスのESCでDGCR8の遺伝子操作.
- 特定のmiRNAファミリーの導入 (let-7とESCC miRNAs).
- セルラーアッセイは,自己再生と分化を評価するためのものです.
- 遺伝子発現プロファイリングとバイオ情報分析.
主要な成果:
- let-7 miRNAsは,Dgcr8(-/-) ESCの自己更新を抑制するが,野生型のESCは抑制しない.
- ESCCのミRNAは,Dgcr8の自己再生に対するlet-7の抑制効果を相殺する.
- let-7は抑制し,ESCCミRNAは間接的に活性化しながら,多数の自己再生遺伝子を活性化します.
- let-7の抑制により,体細胞の分化が誘発された多能幹細胞へと促進される.
結論:
- let-7とESCCのミRNAは,自己再生細胞または分化細胞の運命を安定させるために共通の経路を利用する.
- これらの発見は,幹細胞の多能性と微分化のミRNA媒介による複雑な調節についての洞察を提供します.
- let-7ファミリーは,体細胞の再プログラムを促進する上で重要な役割を果たします.
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