对CTCF拓边界的剖析揭示了增强剂-基因调节的原理
Kyung Lock Kim1, Gilbert J Rahme1, Viraat Y Goel2
1Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; Gene Regulation Observatory, Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA; Departments of Cell Biology and Pathology, Harvard Medical School, Boston, MA 02215, USA.
Molecular cell
|March 7, 2024
概括
在胃肠道 stromal 瘤 (GIST) 中 CTCF 边界的破坏融合了拓关联域 (TAD),使增强器基因通信和纤维细胞生长因子 (FGF) 瘤基因诱导成为可能.
科学领域:
- 基因组学就是基因组学.
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 癌症生物学 癌症生物学
背景情况:
- 增强器基因通信依赖于拓关联域 (TAD) 和CCCTC结合因子 (CTCF) 隔离器.
- 讨论了管理TAD边界的精确机制和结构.
- DNA高甲基化破坏了这些边界在胃肠道 stromal 瘤 (GISTs).
研究的目的:
- 研究特定的CTCF介导边界在隔离纤维细胞生长因子 (FGF) 瘤基因中的作用.
- 了解GIST中DNA高甲基化对边界干扰如何影响增强剂-基因相互作用.
- 阐明增强剂驱动的基因激活的结构和机制基础.
主要方法:
- 分析CTCF结合点及其在TAD形成中的作用.
- 在GISTs中对DNA超甲基化的研究.
- 高分辨率的微C测序用于绘制3D基因组架构.
- 增强剂-促进剂接触频率与基因表达水平的相关性.
主要成果:
- 有多个CTCF位点的边界将含有FGF基因和ANO1增强剂的TAD分开.
- 在边界中破坏四个CTCF图案导致TAD融合.
- 这种融合使ANO1增强剂和FGF3促进剂之间的接触成为可能.
- 增强剂和促进剂位点之间的特定接触与FGF3诱导有定量相关.
结论:
- 通过CTCF介导的边界对于保持增强剂基因隔离至关重要.
- 这些边界的破坏,如在GIST中所见,可以导致瘤基因激活.
- 高分辨率的接触测绘揭示了癌症中3D基因组结构和基因表达之间的因果关系.
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