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相关概念视频

Chromatin Packaging02:21

Chromatin Packaging

15.0K
Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter? 
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order...
15.0K
Duplication of Chromatin Structure02:05

Duplication of Chromatin Structure

5.2K
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...
5.2K
Inheritance of Chromatin Structures03:17

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
Polytene Chromosomes02:04

Polytene Chromosomes

9.9K
Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
9.9K
Euchromatin01:01

Euchromatin

6.7K
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...
6.7K
Nucleosome Remodeling02:54

Nucleosome Remodeling

8.9K
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...
8.9K

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相关实验视频

Updated: May 15, 2025

Deciphering Molecular Mechanism of Histone Assembly by DNA Curtain Technique
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综合人工智能和聚合物物理模型中的染色体结构.

Eric R Schultz1, Soren Kyhl1, Rebecca Willett2

  • 1Pritzker School of Molecular Engineering, The University of Chicago, Chicago, Illinois, United States of America.

PLoS computational biology
|April 9, 2025
PubMed
概括

这项研究引入了一种新的计算方法,将聚合物建模和机器学习结合起来,从Hi-C数据中准确预测三维基因组结构. 这种方法使高效和高通量染色体结构估计成为可能,这对于理解基因调节至关重要.

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Deciphering High-Resolution 3D Chromatin Organization via Capture Hi-C
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Probing The Structure And Dynamics Of Nucleosomes Using Atomic Force Microscopy Imaging
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Probing The Structure And Dynamics Of Nucleosomes Using Atomic Force Microscopy Imaging

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相关实验视频

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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.
  • 计算生物学 计算生物学
  • 生物物理学的生物物理.

背景情况:

  • 基因组的三维 (3D) 组织对于调节基因表达和细胞过程至关重要.
  • 准确地描述基因组结构对于理解这些生物机制至关重要.
  • 实验性确定3D基因组结构是复杂的,需要强大的计算建模.

研究的目的:

  • 开发一种高效准确的计算方法,通过间接实验测量来估计3D染色体结构.
  • 将基于粒子的聚合物模型与分子模拟和机器学习 (ML) 集成.
  • 利用图形神经网络 (GNN) 来从Hi-C数据中提取聚合物模型参数.

主要方法:

  • 采用了基于粒子的染色质聚合物模型.
  • 使用了分子模拟技术.
  • 开发了一个图形神经网络 (GNN),从Hi-C数据中提取交互参数.
  • 该GNN主要是通过从聚合物模型中获得的模拟数据进行训练.

主要成果:

  • 开发的方法准确地估计了所有染色体的染色质结构.
  • 该方法在多个实验细胞系中显示出有效性.
  • 尽管GNN模型主要是基于模拟数据进行训练,但它仍然取得了很高的准确性.

结论:

  • 结合物理建模和ML框架,为3D基因组结构预测提供了一个强大的工具.
  • 这种方法可以从Hi-C数据中准确和高通量估计色素结构.
  • 该方法提供了一个可通用的框架,用于整合各种生物数据模式用于结构建模.