プラリポテンスの誘導におけるマウリン再プログラム因子の役割
Rupa Sridharan1, Jason Tchieu, Mike J Mason
1David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA.
Cell
|January 27, 2009
まとめ
誘発性多能性 (iPS) 細胞の再プログラミングを理解すると,c-Myccが明らかになる.
科学分野:
- 幹細胞生物学 幹細胞生物学とは
- エピジェネティクス エピジェネティクス
- 遺伝子調節 遺伝子調節
背景:
- 誘発性多能幹細胞 (iPS) は,特定の転写因子を発現することによって,線維芽細胞のような体細胞から生成されます.
- Oct4,Sox2,Klf4,c-Mycを含むこれらの要因が多能性を誘発する正確なメカニズムは完全に理解されていません.
研究 の 目的:
- 細胞再プログラム中のOct4,Sox2,Klf4,c-Mycのゲノム全体の結合と発現パターンを調査する.
- プラリポテンシーの誘導におけるこれらの4つの要因の時間的および分離可能な役割を解明する.
主な方法:
- 転写因子プロモーター結合の全ゲノム分析.
- 誘発性多能幹細胞 (iPSC) と部分的に再プログラムされた細胞における遺伝子発現プロファイリング.
- iPSC,胚性幹細胞 (ESC),および線維芽細胞における因子結合と標的遺伝子発現の比較分析.
主要な成果:
- 4つの再プログラミング因子の標的遺伝子は,iPS細胞とESCsの間の重要な重複を示しています.
- 部分的に再プログラムされた細胞では,c-Mycやその他の因子によって併用された遺伝子は,ESCのような結合および発現パターンを表します.
- ESCのOct4,Sox2,Klf4で共結合するプラリポテンシーレギュレータをコードする遺伝子は,部分的に再プログラムされた細胞で転写的に抑制されます.
- 線維芽細胞におけるc-Mycの個々の発現は,他の因子と比較して,ESCに最も近い転写パターンを誘導する.
結論:
- 4つの再プログラミング因子 (Oct4,Sox2,Klf4,c-Myc) は,再プログラミングプロセスに異なる時間的な貢献をしています.
- エクトピックc-Mycは,重プログラム化の初期に主要な役割を果たし,主要な多能性調節体の活性化に先立ちます.
- これらの発見は,細胞の再プログラミングをプラリポテンシーに支配する連続的なイベントの洞察を提供します.
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