染色体可访问性动态和转录调节在Tetrahymena thermophila中
Tengfei Hu1, Zhengyu Luo2, Xiaoyuan Song3
1Hefei National Research Center for Physical Sciences at the Microscale, MOE Key Laboratory for Cellular Dynamics, Center for Advanced Interdisciplinary Science and Biomedicine of IHM, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230026, China.
Science China. Life sciences
|February 7, 2026
概括
在Tetrahymena thermophila中,染色体的可访问性主要是转录起始点 (TSS) 的上游,与人类细胞不同. 这种上游偏差是单细胞真核生物的祖先特征,揭示了染色体组织的进化变化.
科学领域:
- 分子生物学分子生物学
- 基因组学就是基因组学.
- 进化生物学 进化生物学
背景情况:
- 染色质可访问性决定了基因转录,但在有毛的原生体中人们对其了解甚少.
- 一种状原体,Tetrahymena thermophila,为研究染色体动力学提供了一个独特的模型.
研究的目的:
- 使用优化的ATAC-seq.来绘制Tetrahymena thermophila中的染色质景观.
- 为了研究不同生命周期阶段的动态色素变化.
- 了解染色体组织的进化历史.
主要方法:
- 优化ATAC-seq (使用测序测定转化酶可访问性染色体) 用于染色体可访问性概况.
- 在植物生长,饥饿,结合和再养阶段进行动态分析.
- 在13种真核生物物种中进行了比较基因组分析.
主要成果:
- 在T. thermophila中,可访问的染色质主要位于转录起始点 (TSSs) 上游,与人类细胞中的促销器近端可访问性不同.
- 染色体结构在T. thermophila生命周期中随着转录重编程而动态转移.
- 转录抑制改变了染色质的开放性和核细胞组织.
- 上游偏向的可访问性是单细胞真核生物的祖先特征,复杂的促进器架构在更高的脊椎动物中演变.
结论:
- 热虫 (Tetrahymena thermophila) 是研究染色素依赖基因调节的一个有价值的模型.
- 染色体组织在真核生物中显示出显著的进化分歧.
- 转录直接影响染色质结构,特别是在TSSs周围.
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