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相关概念视频

Condensins02:15

Condensins

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Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
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Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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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...
23.2K
Heterochromatin02:38

Heterochromatin

11.4K
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...
11.4K
Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

8.2K
The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer...
8.2K
Euchromatin01:01

Euchromatin

6.8K
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
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DNA Packaging00:58

DNA Packaging

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Overview
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相关实验视频

Updated: Jun 8, 2025

Author Spotlight: Evaluation of Protein-Condensate Dynamics in Live Human Cells
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Author Spotlight: Evaluation of Protein-Condensate Dynamics in Live Human Cells

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阶段分离的染色体部分:通过凝结调节基因表达.

Xin Li1, Chengzhi Liu2, Zhichao Lei3

  • 1Beijing Life Science Academy, Beijing, 102209, China.

Cell insight
|November 8, 2024
PubMed
概括

染色体相关蛋白质通过相分离形成生物分子凝聚物来驱动基因表达. 这些蛋白质凝结物调节基因活动,产生抑制或活跃的基因组组.

关键词:
染色体的分隔是因为染色体的分隔.与染色体相关的蛋白质/复合体基因表达调节 基因表达调节阶段分离 阶段分离 阶段分离

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Chemical Dimerization-Induced Protein Condensates on Telomeres
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Chemical Dimerization-Induced Protein Condensates on Telomeres

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A Cell Free Assay to Study Chromatin Decondensation at the End of Mitosis
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A Cell Free Assay to Study Chromatin Decondensation at the End of Mitosis

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相关实验视频

Last Updated: Jun 8, 2025

Author Spotlight: Evaluation of Protein-Condensate Dynamics in Live Human Cells
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Chemical Dimerization-Induced Protein Condensates on Telomeres
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A Cell Free Assay to Study Chromatin Decondensation at the End of Mitosis
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科学领域:

  • 分子生物学分子生物学
  • 生物物理学的生物物理.
  • 基因组学就是基因组学.

背景情况:

  • 细胞基因组组织成染色体区,其中一些作为生物分子凝聚物.
  • 染色体相关蛋白 (CAPs) 驱动凝结物形成并调节基因表达.
  • 阶段分离是控制染色质凝聚物形成的关键生物物理机制.

研究的目的:

  • 审查转录抑制CAPs在形成抑制的染色体域中的机制.
  • 探索与转录相关的CAP和基因组变异如何通过相分离影响基因表达.
  • 了解相分离在调节基因活性和染色质状态中的作用.

主要方法:

  • 关于染色体组织和基因调节的文献综述.
  • 对染色体相位分离的生物物理原理的分析.
  • 检查染色质相关蛋白和基因组变体的功能.

主要成果:

  • 多价值CAPs促进紧缩,并形成转录抑制的区间.
  • 本质上无序的区域 (IDRs) 介导着活性欧克罗马丁凝聚物的形成.
  • 压缩和活性凝聚物都表现出相位分离和选择性成分丰富.

结论:

  • 阶段分离是形成转录抑制和活性染色体组件的核心.
  • CAPs和基因组变体利用相分离来控制基因表达,影响转录水平和染色质状态.
  • 了解这些机制对于破译基因调节和潜在的治疗点至关重要.