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相关概念视频

Chromatin Immunoprecipitation- ChIP02:36

Chromatin Immunoprecipitation- ChIP

12.1K
Chromatin immunoprecipitation, or ChIP, is an antibody-based technique used to identify sites on DNA that bind to transcription factors of interest or histone proteins. It also helps determine the type of histone modifications such as acetylation, phosphorylation, or methylation.
Types of ChIP
ChIP can be divided into two types - X-ChIP and N-ChIP. X-ChIP involves in vivo cross-linking of histones and regulatory proteins to DNA, fragmenting the DNA by sonication, and isolating the protein-DNA...
12.1K
Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

24.6K
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
Heterochromatin02:38

Heterochromatin

17.8K
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...
17.8K
Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

9.3K
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...
9.3K
Euchromatin01:01

Euchromatin

8.8K
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...
8.8K
Nucleosome Remodeling02:54

Nucleosome Remodeling

10.8K
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...
10.8K

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相关实验视频

Updated: Jan 16, 2026

Capturing Chromosome Conformation Across Length Scales
10:15

Capturing Chromosome Conformation Across Length Scales

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预测色素构造的接触地图

Alan Min1, Jacob Schreiber2, Anshul Kundaje2

  • 1Department of Statistics, University of Washington, Seattle, Washington, United States of America.

PloS one
|September 29, 2025
PubMed
概括
此摘要是机器生成的。

研究人员开发了一种机器学习模型来分析来自各种试验和细胞类型的3D基因组结构数据. 这种模型有助于理解染色体3D结构在不同细胞类型和实验方法中如何变化.

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Mapping Mammalian 3D Genome Interactions with Micro-C-XL
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Deciphering High-Resolution 3D Chromatin Organization via Capture Hi-C
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相关实验视频

Last Updated: Jan 16, 2026

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10:15

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Mapping Mammalian 3D Genome Interactions with Micro-C-XL
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Deciphering High-Resolution 3D Chromatin Organization via Capture Hi-C
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科学领域:

  • 基因组学就是基因组学.
  • 分子生物学分子生物学
  • 计算生物学 计算生物学

背景情况:

  • 在过去的15年里,下一代测序试验已经推进了DNA在核中的3D构造的研究.
  • 不同的测试提供了对3D染色体架构的不同的看法,复杂化了对基因组结构-功能关系的理解.
  • 关键问题涉及染色体3D结构如何在细胞类型之间以及在测试方法之间不同.

研究的目的:

  • 系统地探索基因组3D架构在细胞类型和试验类型中的变异.
  • 开发一个用于预测和分析3D染色质接触图的计算模型.
  • 在分区,域和循环层面研究染色质结构的变化.

主要方法:

  • 汇集了来自不同试验和细胞类型的3D染色体数据集 (2D接触图) 的综合集合.
  • 开发并应用机器学习模型来预测收藏中缺失的联系人地图数据.
  • 利用预测模型系统地分析结构变化.

主要成果:

  • 机器学习模型成功预测了缺失的3D染色质接触图.
  • 系统的探索揭示了基因组3D架构,包括隔间,域和循环,如何在细胞类型之间不同.
  • 在不同试验类型之间,甚至在相同的细胞类型内,也观察到色素结构的显著变化.

结论:

  • 机器学习提供了一种强大的方法来整合和分析各种3D基因组构造数据集.
  • 了解细胞类型,检测方法和染色体3D结构之间的相互作用对于解释基因组功能至关重要.
  • 这项研究为剖析基因组架构及其功能影响的复杂性提供了一个框架.