用端粒-C映射端粒3D交互体,揭示了与端粒维护相关的重复元素枢纽
Yi-An Chen1, Ogechukwu Mbegbu1, Noelle H Fukushima1
1The Translational Genomics Research Institute (TGen), Phoenix, Arizona, 85004, USA.
bioRxiv : the preprint server for biology
|November 24, 2025
概括
我们开发了Telomere-C来绘制3D端粒相互作用的地图,揭示了在重复元素中定的超远距离接触. 这重新定义了端粒相互作用体,并确定了D20S16相互作用作为端粒途径替代延长的签名.
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:
- 端粒对基因组完整性至关重要,但由于重复的DNA和当前方法的局限性,人们对它们的3D染色体相互作用知之甚少.
- 精确地绘制端粒相互作用的地图对于理解基因调节和端粒维护至关重要.
研究的目的:
- 开发一种新型的高通量方法,即通过测序捕获端粒构造 (Telomere-C),用于全基因组识别端粒色素相互作用.
- 绘制各种细胞系中的3D端粒相互作用组图,并确定新的相互作用模式和调节元素.
主要方法:
- 通过测序 (Telomere-C) 捕获端粒形状的开发和应用.
- 在正常纤维细胞和癌症细胞系 (端粒酶阳性和ALT) 中对端粒色蛋白相互作用的分析.
- 标识和验证端粒相互作用地点,包括超远距离接触.
主要成果:
- 端粒-C成功地绘制了数百万个与端粒相关的读数,并确定了数千个相互作用峰值.
- 发现了超远程相互作用 (>5 Mb),占接触的80%以上,主要固定在重复元素 (ITS, TAR1, D20S16).
- 发现了相互作用聚类和细胞类型特定的端粒维护之间的强烈相关性,D20S16相互作用在ALT癌细胞中独特丰富.
结论:
- 构建了第一个高分辨率的端粒3D相互作用的地图,以超长距离与重复元素的接触为主.
- 确立的端粒D20S16相互作用作为替代端粒延长 (ALT) 途径的分子特征.
- 提供了对端粒核组织及其在癌症生物学中的作用的基本见解.
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