在TGF-β信号传递中,MAD蛋白的转录合作伙伴
X Chen1, M J Rubock, M Whitman
1Department of Cell Biology, Harvard Medical School, Boston, Massachusetts 02115, USA.
Nature
|October 24, 1996
概括
转化生长因子-β (TGF-β) 信号传递对Xenopus胚胎中中层体发育至关重要. 一个新的翼螺旋转录因子和XMAD2形成一个复杂的调节Mix.2基因表达.
科学领域:
- 发展生物学 发展生物学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 转化生长因子-β (TGF-β) 超级家族在早期胚胎中皮层诱导中发挥着关键作用.
- 活性蛋白,TGF-β超级家族的活性蛋白类成员,触发了Xenopus中的特定基因反应.
- 混合2基因是一种即时早期响应基因,通过类似活性素的信号激活.
研究的目的:
- 为了确定调节Mix.2基因表达的DNA结合活性.
- 描述TGF-β超级家族在Xenopus胚胎生成中的信号传递中所涉及的分子组件.
- 阐明TGF-β信号调节早期胚胎中的基因表达的机制.
主要方法:
- 克隆了一种新型的翼螺旋转录因子,负责与Mix.2促进体的ARE元素结合.
- 研究已识别的转录因子与TGF-β信号传感器XMAD2.2.之间的相互作用.
- 在早期胚胎基因调节中开发TGF-β超级家族信号转导模型.
主要成果:
- 一个新的翼螺旋转录因子被确定为Mix.2促销者的ARE.的特定位点DNA结合元件.
- 这种转录因子是TGF-β超级家族信号传递的直接目标.
- XMAD2以活性因子依赖的方式与这种转录因子形成复合体,形成一个激活的ARE结合复合体.
结论:
- 在早期的Xenopus胚胎发生过程中,TGF-β超级家族信号调节特定基因的表达,例如Mix.2,在早期的Xenopus胚胎发生过程中.
- 一种新的转录因子和XMAD2是这个信号通路的关键组成部分.
- 一个拟议的模型解释了TGF-β介导的胚胎发育中的基因调节机制.
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