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相关概念视频

RNA Polymerase II Accessory Proteins02:36

RNA Polymerase II Accessory Proteins

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Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
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Heterochromatin02:38

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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...
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Euchromatin01:01

Euchromatin

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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.
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Chromatin Position Affects Gene Expression02:35

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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)
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Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

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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...
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Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
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相关实验视频

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A Method to Study de novo Formation of Chromatin Domains
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DNA 元素与人类基因结合 规范的多合体压制复合体1

Juan I Barrasa1, Tatyana G Kahn1, Moa J Lundkvist1

  • 1Department of Molecular Biology, Umeå University, 901 87 Umeå, Sweden.

Nucleic acids research
|October 19, 2023
PubMed
概括
此摘要是机器生成的。

研究人员确定了将多抑制综合体1 (PRC1) 与发育基因结合的DNA元素. 这些元素具有与结合多抑制复合物2 (PRC2) 具有明显的特征,为基因调节提供了新的见解.

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科学领域:

  • 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
  • 发育生物学 发展生物学
  • 基因组学就是基因组学.

背景情况:

  • 在多细胞动物发育过程中,多组蛋白对表观遗传抑制至关重要.
  • 多胞体抑制复合体1 (PRC1) 和多胞体抑制复合体2 (PRC2) 是关键复合体,它们一起工作以使发育基因沉默.
  • 针对PRC1和PRC2特定基因的精确机制尚未完全理解.

研究的目的:

  • 确定负责将正规PRC1与人类发育基因结合的DNA元素.
  • 描述与PRC1和PRC2结合相关的序列特征.
  • 了解不同的DNA元素如何为PRC1和PRC2.2的向做出贡献.

主要方法:

  • 与正规PRC1结合相关的DNA元素的全基因组识别.
  • 对PRC1和PRC2向的DNA序列特征进行比较分析.
  • 研究DNA元素的组合潜力,以招募两种复合体.

主要成果:

  • 确定了数百个将正规PRC1与人类发育基因结合在一起的DNA元素.
  • 控制PRC1结合的序列特征与促进PRC2结合的序列特征不同.
  • 存在一系列的DNA元素,它们在主要招募PRC1,PRC2或两者的能力上有所不同.

结论:

  • 这项研究揭示了特定的DNA元素,这些元素将正规的PRC1引导到发育基因.
  • 独特的序列特征决定了PRC1和PRC2.2的不同招募.
  • 这提供了对多复合准的更细致的理解,类似于Drosophila Polycomb Response Elements,但具有更强的灵活性.