低亲和度结合位点集群赋予霍克斯特异性和监管稳健性.
Justin Crocker1, Namiko Abe2, Lucrezia Rinaldi2
1Janelia Research Campus, Howard Hughes Medical Institute, 19700 Helix Drive, Ashburn, VA 20147, USA.
Cell
|January 6, 2015
概括
像Ultrabithorax (Ubx) 这样的Hox蛋白通过结合增强剂中的低亲和度DNA位点集群来实现Drosophila中的特定基因调节. 这种增强器架构确保了在可变环境中强大的基因表达.
科学领域:
- 发育生物学是发展生物学.
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
背景情况:
- 霍克斯转录因子对于建立动物体图区域特征至关重要.
- 一个关键的悖论是,在体外结合类似DNA序列的Hox蛋白如何赋予特定的解剖特征.
- 了解霍克斯基因功能的调节机制对于发育生物学至关重要.
研究的目的:
- 为了研究Hox蛋白Ultrabithorax (Ubx) 如何与Extradenticle (Exd) 复合,实现特定的DNA结合和基因调节.
- 阐明增强剂内低亲和度结合点在赋予Hox基因功能特异性和稳健性的作用.
- 检查增强器架构的进化保存及其对基因表达的影响.
主要方法:
- 在Drosophila shavenbaby基因增强剂中,对低亲和度DNA位点的Ultrabithorax (Ubx) 和Extradenticle (Exd) 蛋白质结合的分析.
- 在体内研究,以评估在不同的环境条件下增强剂功能的特异性和稳定性.
- 对个别结合点保护与整体增强器架构保护的比较分析.
主要成果:
- Ubx-Exd复合体特别结合到Shavenbaby基因增强剂中非常低亲和度位点的集群.
- 这些低亲和度位点在体内赋予了Ubx结合的特异性.
- 为了在可变的环境中强大的shavenbaby表达,需要多个集群网站.
- 虽然单个绑定站点没有得到保护,但集群增强器架构得到了维护,对功能至关重要.
结论:
- 增强器架构,特别是低亲和度结合位点的集群,对于实现特定和强大的霍克斯基因表达至关重要.
- 自然选择在增强剂水平上起作用,有利于特定密度的低亲和位点,以获得精确的发育结果.
- 这项研究解决了霍克斯蛋白特异性的悖论,强调了结合部位的排列和调节元素的亲和力的重要性.
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