拓胺酶调节的全基因组DNA超圈域与核部位同位,并调节人类基因表达
Qian Yao1, Linying Zhu1, Zhen Shi1
1Laboratory of Biochemistry and Molecular Biology, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.
Nature structural & molecular biology
|August 16, 2024
概括
研究人员开发了一种新的DNA超卷试验 (ATMP-seq) 来绘制全基因组超卷域的地图. 这揭示了DNA超级卷如何影响基因表达和染色体调节.
科学领域:
- 生物物理学的生物物理.
- 基因组学就是基因组学.
- 分子生物学分子生物学
背景情况:
- DNA超级卷对生物过程至关重要,但对染色质的理解不佳.
- 目前研究DNA超级卷的方法在准确性和基因组覆盖方面存在局限性.
研究的目的:
- 开发一种新的,定量和低偏差的测试方法,用于绘制DNA超级卷的地图.
- 为了研究全基因组组织和DNA超级卷的调节.
- 了解DNA超级卷,基因表达和染色体结构之间的关系.
主要方法:
- 开发了亚酸-三甲基psoralen测序 (ATMP-seq) 用于定量DNA超线圈分析.
- 应用ATMP-seq在人类基因组中以千基基底分辨率绘制DNA超级卷.
- 集成的ATMP-seq数据与基因组组件和拓关联域 (TAD) 信息.
主要成果:
- 在基因周围可视化了依赖转录的负和正超圈域.
- 发现了由I和IIβ.topoisomerases调节的千兆基基尺度超级卷曲域 (SDs).
- 显示转录驱动远程超级卷的传播,影响SD形成.
- 发现的SDs与A/B区块共定位,但与TAD不同,在TAD边界有超级卷.
- 证明全基因组DNA超级卷变化与细胞状态不同,并调节基因表达.
结论:
- ATMP-seq为量化全基因组DNA超级卷分析提供了一个强大的工具.
- 兆基量级超级卷曲域是基因组组织的一个基本特征.
- 对于染色体调节和基因表达控制,DNA超级卷变的动态至关重要.
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