需要的增强剂-马特林-3网络相互作用,以实现家庭主域转录程序
Dorota Skowronska-Krawczyk1, Qi Ma1, Michal Schwartz2
1Howard Hughes Medical Institute, Department of Medicine, School of Medicine, University of California, San Diego, La Jolla, California 92093, USA.
Nature
|August 15, 2014
概括
像Pit1这样的家庭主体蛋白质通过将增强剂与核母体-3网络连接起来来调节基因表达. 这种由Satb1和β-catenin介导的结合对于激活发育基因至关重要.
科学领域:
- 分子生物学分子生物学
- 发展生物学 发展生物学
- 遗传学 是一个遗传学.
背景情况:
- 家庭主体蛋白质是发育过程中基因表达的关键调节者.
- 控制本地主蛋白转录活性的精确分子机制尚未完全理解.
- 皮特1 (Pou1f1) 是一个对于发育至关重要的POU-家庭基因转录因子.
研究的目的:
- 阐明同居基因转录因子Pit1激活目标基因转录的分子机制.
- 研究核结构和蛋白质相互作用在Pit1介导的基因调节中的作用.
主要方法:
- 研究了Pit1-占用增强剂与富含核matrin-3的网络的结合.
- 评估了Pit1与Satb1和β-catenin关联的要求,以实现增强器连接.
- 利用一种主导负人类PIT1 (R271W) 突变模型来研究功能丧失和救援实验.
主要成果:
- 将Pit1-占用增强剂与核母蛋白-3网络的结合对于转录激活至关重要.
- 对于这种绑定事件,需要Pit1与Satb1和β-catenin的关联.
- 与疾病相关的PIT1突变 (R271W) 破坏了这些相互作用,阻断了基因激活,但可以通过人工连接到matrin-3网络来挽救.
结论:
- 揭示了一个意想不到的机制,在这种机制中,家庭主体因子将目标基因调节元素定位到亚核架构结构中.
- 证明了家庭主体因子/β-catenin/Satb1复合体在将增强剂连接到matrin-3网络以激活发育基因中的关键作用.
- 这些发现提供了对由PIT1突变引起的结合性垂体激素缺乏症的分子基础的见解.
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