来自端粒和间位点的TERRA转录和促进体
Marco Santagostino1, Lorenzo Sola1, Eleonora Cappelletti1
1Department of Biology and Biotechnology "Lazzaro Spallanzani," University of Pavia, 27100 Pavia, Italy.
概括
研究人员在人类子端粒和染色体内发现了许多新的TERRA促进体,揭示了它们来自细分重复的起源. 这些促进体可以驱动来自间歇性端粒序列的TERRA转录的合成,对TERRARNA总体池作出重大贡献.
科学领域:
- 基因组学和分子生物学
- 非编码RNA研究研究
- 表观遗传学和染色体生物学
背景情况:
- 特拉 (Telomeric Repeat-containing RNA) 是从人类端粒中转录的长非编码RNA.
- 之前的研究已经确定了CpG岛屿重复序列驱动的分端粒中的TERRA促进体.
- T2T-CHM13v2.0基因组组合提供了一个更完整的视图的亚端粒和内染色体区域.
研究的目的:
- 通过使用T2T-CHM13v2.0人类参考基因组,全面识别和描述TERRA促进体.
- 研究TERRA促进者的基因组组织和进化起源.
- 确定间歇性端粒序列 (ITS) 的转录活性及其对TERRA产生贡献.
主要方法:
- 对T2T-CHM13v2.0人类参考基因组进行全基因组分析,以定位TERRA促进体.
- 基于其基因组组织 (亚端粒与内染色体) 的鉴定促进体的分类.
- 进行比较序列分析以追踪促销物来源.
- 进行RT-PCR和RNA-seq实验,以评估来自ITS的TERRA转录合成,跨越各种细胞系.
主要成果:
- 在46个子端粒中,有39个含有TERRA促进体,按组织分类.
- 发现了106种内染色体TERRA类促进体,其中47种可能调节附近的基因.
- 亚端粒和间歇性促进体起源于细分重复的新型家族.
- TERRA转录可以从ITS合成,它们的转录水平与端粒重复长度相关.
- 在不同的细胞类型中,TERRA表达有很大的差异,包括端粒酶阳性和阴性细胞系.
结论:
- 人类基因组包含大量的TERRA促进体,分别位于分端体和染色体内位置.
- TERRA发起者代表了一个新发现的,有着古老起源的细分重复的类别.
- 间歇性端粒序列是TERRA转录的重要来源,为TERRA总体池做出贡献.
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