Tbx3は,誘導された多能幹幹細胞の生殖能力を改善する
Jianyong Han1, Ping Yuan, Henry Yang
1Stem Cell and Developmental Biology, Genome Institute of Singapore, 138672, Singapore.
Nature
|February 9, 2010
まとめ
転写因子Tbx3をOct4,Sox2,Klf4 (OSK) に加えると,誘発性多能幹細胞 (iPS) の質が著しく向上する. これらの改善されたOSKT iPS細胞は,優越した生殖線伝達と生殖組織への貢献を示しています.
科学分野:
- 幹細胞生物学 幹細胞生物学
- 生殖生物学 生殖生物学
- 遺伝学 遺伝学とは
背景:
- 誘発性多能幹細胞 (iPS) は,胚性幹細胞 (ESC) に対する有望な代替手段を提供している.
- 最小限のOct4,Sox2,Klf4 (OSK) 因子は,体細胞をiPS細胞に再プログラムすることができます.
- iPS細胞の質,特に生殖線の可能性を評価するには,遺伝子発現を超えて厳格な評価が必要です.
研究 の 目的:
- 転写因子Tbx3がiPS細胞の質と再プログラム効率に与える影響を調査する.
- Tbx3-改変されたiPS細胞が,生殖線伝播とキメアリズムに与える貢献を評価する.
- Tbx3が多能性と再プログラミングに影響を与える分子メカニズムを理解する.
主な方法:
- Oct4,Sox2,Klf4 (OSK) を使ってTbx3 (OSKT) を含むまたは含まないiPS細胞を生成する.
- テトラプロイド補充によるキメアリズムと生殖線伝播に対するiPS細胞の貢献度評価.
- ESCにおけるTbx3結合部位を特定するために,全ゲノムクロマチン免疫プレシピテーションシーケンシング (ChIP-seq) を用いる.
主要な成果:
- Tbx3は,OSKT iPS細胞と呼ばれるiPS細胞の質を大幅に改善しました.
- OSKT iPS細胞は,性腺に優越した生殖細胞の貢献と,より高い生殖線伝播率を示した.
- グローバル遺伝子発現プロファイリングでは,OSKとOSKTのiPS細胞を区別できず,質的な違いが示唆されました.
結論:
- Tbx3は,iPS細胞の発達の可能性と品質を高める上で重要な役割を果たしています.
- 異なる再プログラム方法によって生成されたiPS細胞の間には,本質的な質的差異が存在します.
- in vivoの機能性アッセイを含むiPS細胞の厳格な特徴づけは不可欠です.
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