胚性幹細胞における多能性維持因子であるナノグの機能表現クローニング
Ian Chambers1, Douglas Colby, Morag Robertson
1Institute for Stem Cell Research, University of Edinburgh, King's Buildings, West Mains Road, Edinburgh EH9 3JQ, Scotland. ichambers@ed.ac.uk
Cell
|June 6, 2003
まとめ
ホメオドメインのタンパク質であるナノグは,胚性幹細胞 (ES細胞) の自己再生と多能性を維持するために重要である. 初期の胚および多能細胞におけるその発現は,幹細胞のアイデンティティにおけるその役割を強調する.
科学分野:
- 幹細胞生物学 幹細胞生物学とは
- 発達生物学 発達生物学とは
- 分子遺伝学 分子遺伝学
背景:
- 胚性幹細胞 (ES) は広範に増殖するが,分化の可能性を保持する.
- 転写因子ネットワークは,ES細胞の自己再生を制御し,差別化を抑制する可能性があります.
研究 の 目的:
- エクスプレッション・クローニングを用いて,ES細胞の自己再生に起因する重要な転写因子を特定する.
- プラリポテンシーとES細胞の同一性を維持するナノグの役割を明らかにする.
主な方法:
- マウスのES細胞における表現クローニングで,自己再生の決定因子を分離する.
- 多能および分化細胞におけるナノグmRNA発現の分析.
- ES細胞の自己再生,分化,胚のコロニー化におけるナノグの機能を研究する.
主要な成果:
- 新しいホメオドメインのタンパク質であるNanogは,ES細胞の伝播の決定的な決定因子として特定されました.
- ナノグmRNAは,多能細胞と初期胚で発現するが,微分細胞では発現しない.
- 固有のナノグは,Stat3信号で機能し,ES細胞の自己再生を促す;上昇したナノグの発現はStat3をバイパスしてOct4レベルを維持することができます.
結論:
- ナノグは,ES細胞のアイデンティティを定義する転写因子階層において中心的な役割を果たします.
- ナノグは,ES細胞の多能性,自己再生,および発達の可能性を維持するために不可欠です.
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