在IL3绝缘体CTCF结合部位内需要一个上游的二次DNA动机来增强阻断绝缘体活动
Sarion R Bowers1,2, Peter N Cockerill2,3
1Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge, United Kingdom.
PloS one
|February 9, 2026
概括
CCCTC结合因子 (CTCF) 蛋白质将基因组组织成功能域. 具有上游动机的特定CTCF站点介导增强剂阻断绝缘体活动,揭示了取决于上下文的功能.
科学领域:
- 基因组学就是基因组学.
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- CCCTC结合因子 (CTCF) 将脊椎动物的基因组组织成功能色素域.
- CTCF站点具有双重作用:有些网站作为隔离剂阻断增强剂-促进剂通信,而另一些网站则通过DNA循环挤出来促进它.
- 确切的机制决定CTCF的各种功能仍然不清楚.
研究的目的:
- 阐明CTCF独特功能的分子基础,特别是其绝缘体活性.
- 确定特定的DNA序列元素和CTCF蛋白域,参与高亲和结合和增强剂阻断.
主要方法:
- 对CTCF结合部位的分析,包括来自IL3位点的高 afinity部位.
- 在CTCF核心基因和上游共识序列 (CAGCTGTTCC) 的位点定向突变发生.
- 挖掘已发布的数据,以将CTCF函数与序列特征相关联.
主要成果:
- CTCF使用指9-11和上游DNA共识序列 (CAGCTGTTCC) 进行高亲和度结合和增强剂阻断绝缘体活性.
- 在IL3位点的一个单一的高亲和度CTCF位点有效地阻止了增强剂驱动的IL3促进体激活.
- 上游序列的突变 (CTGCAGCTTT) 取消了CTCF站点的绝缘体活动.
结论:
- 一个特定的CTCF位点子集,以上游DNA共识模式为特征,赋予绝缘体和屏障活动.
- 这种模式使得CTCF能够调解增强剂阻断功能,使其与参与增强剂-促进剂通信的网站区分开来.
- CTCF的功能多功能性源于特定环境的DNA结合和使用不同的序列元素.
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