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相关概念视频

Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

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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...
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Nucleosome Remodeling02:54

Nucleosome Remodeling

10.7K
Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
10.7K
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...
24.6K
The Nucleosome Core Particle01:12

The Nucleosome Core Particle

2.1K
Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...
2.1K
The Nucleosome Core Particle02:10

The Nucleosome Core Particle

14.1K
Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
14.1K
Histone Modification02:32

Histone Modification

15.9K
The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
15.9K

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相关实验视频

Updated: Jan 12, 2026

Author Spotlight: Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates
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Author Spotlight: Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates

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核细胞背景调节染色体读者偏好.

Matthew R Marunde1, Irina K Popova1, Nathan W Hall1

  • 1EpiCypher Inc., Durham, NC 27709, United States.

Nucleic acids research
|November 3, 2025
PubMed
概括
此摘要是机器生成的。

了解蛋白质如何与染色质结合,是疾病研究的关键. 这项研究表明,使用核体,而不仅仅是基因,揭示了更准确的蛋白质结合偏好,改善了对生物机制和疾病的洞察力.

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Author Spotlight: Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates
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Sequential Salt Extractions for the Analysis of Bulk Chromatin Binding Properties of Chromatin Modifying Complexes
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科学领域:

  • 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.
  • 基因组学就是基因组学.

背景情况:

  • 染色体上的基因组后翻译修饰 (PTMs) 调节基因表达和细胞功能.
  • 了解染色体读者对PTM的结合偏好对于解释生物机制和疾病至关重要.
  • 目前使用希斯顿的方法缺乏核细胞的完整监管环境.

研究的目的:

  • 为了研究染色体读者的结合偏好,对基因素和核体.
  • 为了比较单一与多价值读者参与的监管潜力.
  • 通过体内基因组映射来验证体外发现.

主要方法:

  • 使用定义的和核基质的生物化学试验.
  • 对各种单和多价值染色体阅读器进行审讯.
  • 染色体读取器依赖的切割,然后进行转化酶可访问的测序 (CUT&RUN),用于体内映射.

主要成果:

  • 与类相比,核细胞背景显著改进了读者结合偏好.
  • 多价值的读者参与表明了除了简单的附加效应之外的监管作用.
  • 阐明了特定的结合机制,包括L3MBTL1废除和CBX7 CD-ATL对H3K27me3.3的协同特异性.
  • 在体外发现得到了通过体内CUT&RUN数据的验证.

结论:

  • 使用更具代表性的核酶子基质可以更深入地了解生物机制和人类疾病.
  • 这项研究强调了考虑完整核细胞背景对于准确的染色体读者结合研究的重要性.
  • 这些发现提供了潜在的治疗机会,通过阐明PTM结合在疾病发病过程中的作用.