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Chromatin Immunoprecipitation (ChIP) using Drosophila tissue
Published on: March 23, 2012
在Drosophila胚胎中的绝缘体对增强剂-促进剂相互作用的调节
1Department of Biology, Center for Molecular Genetics, La Jolla, California 92093-0347, USA.
Nature
|August 10, 1995
概括
绝缘体DNA元素,或边界元素,选择性地阻断增强剂与目标促进体的相互作用. 这些调节元素可以灵活调节复杂的遗传位置中的增强剂-促进剂相互作用.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 发展生物学 发展生物学
背景情况:
- 绝缘体DNA序列,也称为边界元素,在功能性地隔离邻近基因方面发挥着至关重要的作用.
- 它们防止远端增强剂和不适当的向促进剂之间的相互作用,确保精确的基因调节.
- 在Drosophila中具有很好的特征的绝缘体包括一个吉普赛逆转移素片段和scs/scs的序列.
研究的目的:
- 为了研究果虫绝缘体在阻断增强剂-促进剂相互作用中的功能.
- 确定绝缘体是否有选择性地阻断远端增强剂及其对其他促进剂的可访问性.
- 探索绝缘体在调节复杂的遗传位点中的作用.
主要方法:
- 使用定义的均跳过 (eve) 条纹增强器来测试绝缘器功能.
- 在增强剂和向促进剂之间放置绝缘体,以评估阻断活性.
- 采用两种不同转录的促销器的序列来评估增强器的可访问性.
主要成果:
- 吉普赛和scs/scs的绝缘剂都有效地阻止了eve条纹增强剂和目标促进剂之间的相互作用.
- 绝缘器选择性地阻断了远端增强剂,证明了它们的功能特异性.
- 一个促进体被阻断的增强剂仍然可以进入另一个促进体,这表明绝缘体不会传播染色体结构变化.
- 吉普赛绝缘器并没有阻止沉声器元素与基底促进器的相互作用.
结论:
- 绝缘体的功能是灵活的调节元件,而不仅仅是隔离邻近的位置.
- 它们可以调节复杂的遗传基因位点和促进体内的增强剂-促进体相互作用.
- 绝缘体功能是特定的,允许选择性阻断增强剂活性.
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