転写因子Sp1は胚の早期発達には不可欠であるが,細胞の成長と分化には欠かせない
1Erasmus University Rotterdam, Department of Cell Biology, The Netherlands.
Cell
|May 16, 1997
まとめ
転写因子Sp1は,胚の発達と細胞の維持に不可欠です. 欠乏すると,発達異常とメチル-CpG結合タンパク質2 (MeCP2) の発現が低下し,細胞の分化に影響を及ぼします.
科学分野:
- 発達生物学 発達生物学とは
- 遺伝子規制 遺伝子規制
- エピジェネティクス エピジェネティクス
背景:
- 転写因子Sp1 (Sp1) は,遺伝子発現,細胞サイクル,染色体構造に関与しています.
- Sp1がメチル化のないCpG群島と活性クロマチンの維持における役割が提案されている.
- メチル-CpG結合タンパク質2 (MeCP2) は,細胞の分化を維持するために不可欠です.
研究 の 目的:
- 転写因子Sp1.1のインビボ機能を調査する.
- Sp1遺伝子の不活性化が胚の発達と遺伝子発現に及ぼす影響を決定する.
- 細胞過程におけるSp1とMeCP2の関係を解明する.
主な方法:
- Sp1-欠乏した (Sp1-/-) マウスを作るための遺伝子ターゲティング.
- 胚の発達と生存能力の分析.
- Sp1-/-胚における推定Sp1標的遺伝子とMeCP2の遺伝子発現分析.
主要な成果:
- Sp1-/-胚は,発育遅延,複数の異常,および11日頃の胚死亡を示す.
- Sp1欠乏にもかかわらず,細胞サイクル遺伝子を含む多くの標的遺伝子は影響を受けません.
- CpG島はメチル化から自由であり, Sp1-/-胚のグロービンロシで活性クロマチンが形成されます.
- 重要なことに,MeCP2の発現はSp1-/-胚では著しく低下しています.
結論:
- Sp1は正常な胚の発達と生存に不可欠である.
- MeCP2発現を調節するSp1の役割は,分化細胞を維持するために重要である.
- Sp1は,MeCP2と潜在的に細胞の分化維持を含むプロセスにおける重要な調節体として作用する.
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