相关实验视频
Updated: Jun 26, 2025

11:58
In-Nucleus Hi-C in Drosophila Cells
Published on: September 15, 2021
4.1K
在原生染色质上保持指转录因子的连续性是动态基因组组织的基础
Siling Hu1,2,3, Yangying Liu1,2,3, Qifan Zhang1,2,3
1CAS Key Laboratory of Genome Sciences and Information, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China.
Molecular systems biology
|May 14, 2024
概括
这项研究引入了S-score来量化转录因子 (TF) 对原生染色质的结合稳定性,揭示了对基因组组织的见解. S-score比传统的交叉连接方法更好地解释TF保留和染色质结构.
科学领域:
- 分子生物学分子生物学
- 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.
背景情况:
- 与染色体结合的转录因子 (TF) 影响基因表达和基因组结构.
- 传统的甲交叉连接方法用于研究TF-DNA相互作用可能不准确地表示TF占用水平.
- 了解TF在原生染色体上的停留时间对于破译基因组动态至关重要.
研究的目的:
- 将转录因子的占用和保留水平映射到原生染色质上,特别是CTCF和MAZ等指蛋白.
- 开发一个定量指标,S-score,以评估TF在各种绑定站点的连续性.
- 研究TF保留,染色质结构和表观遗传修饰之间的关系.
主要方法:
- 开发了一种新的方法,在没有累积交叉链接的情况下对原生染色质上绘制TF足迹.
- 嵌入强化扰动条件以确定S-score,这是TF保留的定量衡量标准.
- 分析了TF动机中的序列特征和与SUMOylation水平和转录活性相关的TF保留.
主要成果:
- S-score准确量化了CTCF和MAZ保留在原生染色体上的连续性.
- 与其他方法相比,原生染色素保留的CTCF位点显示出由S-score更好地解释的序列特征.
- CTCF保留与局部SUMOylation相关,与转录活性相反相关,揭示了差异性染色体结构稳定性.
结论:
- 建立了TF保留连续性的范式,跨越了原生染色质上的结合点.
- S-score比传统的交叉连接测试更准确地衡量TF占用率和稳定性.
- 证明TF保留动态是理解动态基因组组织和调节的关键.
相关概念视频
Inheritance of Chromatin Structures
6.2K
Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
6.2K
Chromatin Position Affects Gene Expression
23.3K
Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area.
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the...
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the...
23.3K
Heterochromatin
12.5K
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...
12.5K
Transcription Factors
75.8K
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
75.8K
DNA Packaging
102.4K
Overview
102.4K
Duplication of Chromatin Structure
5.5K
The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
5.5K

