通过DSP1对Drosophila Polycomb组蛋白质的染色质的招募
Jérôme Déjardin1, Aurélien Rappailles, Olivier Cuvier
1Institute of Human Genetics, CNRS, 141 rue de la Cardonille, F-34396 Montpellier Cedex 5, France.
Nature
|March 26, 2005
概括
背切换蛋白1 (DSP1) 与聚合体响应元素 (PREs) 结合对于招募聚合体组 (PcG) 蛋白质至关重要. 破坏DSP1结合将PREs转化为三体反应元素 (TREs),影响基因调节.
科学领域:
- 发展生物学 发展生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 分子生物学分子生物学
背景情况:
- 多组 (PcG) 和三组 (trxG) 蛋白调节基因表达.
- 这些蛋白质与特定的DNA区域结合,称为多反应元素 (PREs) 和三体反应元素 (TREs).
- PcG/trxG蛋白向PREs/TREs招募的机制在很大程度上是未知的.
研究的目的:
- 研究背切换蛋白1 (DSP1) 在招募PcG蛋白到PREs中的作用.
- 阐明PcG蛋白结合和转录状态维护背后的分子机制.
主要方法:
- 腹部B基因的调节元件 (Ab-Fab) 含有PRE和TRE.的特征.
- 在体内结合测试以评估DSP1与PREs的相互作用.
- 突变分析以确定废除DSP1结合对PcG招募和基因沉默的影响.
主要成果:
- 背切换蛋白1 (DSP1) 与Ab-Fab和其他PREs中的特定动机结合.
- 这种DSP1结合基因,当添加到具有已知结合位点的人工序列中时,就足以招募PcG蛋白.
- 阻止DSP1与PRE结合的突变取消了PcG的结合和沉默,将PRE转换为组成的TRE.
结论:
- 与PREs结合的DSP1对于招募PcG蛋白质至关重要.
- 通过PcG蛋白质,DSP1起到通过PcG蛋白质建立和维持静态染色质状态的关键作用.
- 了解DSP1的作用,可以了解发育过程中的表观遗传基因调节.
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