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相关概念视频

Position-effect Variegation02:32

Position-effect Variegation

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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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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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Heterochromatin02:38

Heterochromatin

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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...
14.6K
Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
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Chromatin Structure Regulates pre-mRNA Processing02:41

Chromatin Structure Regulates pre-mRNA Processing

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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
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Histone Modification02:32

Histone Modification

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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...
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相关实验视频

Updated: Sep 17, 2025

Analysis of Histone Antibody Specificity with Peptide Microarrays
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Analysis of Histone Antibody Specificity with Peptide Microarrays

Published on: August 1, 2017

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不同的寡合化调节PHF13染色体的亲和力和功能.

Francesca Rossi1, Alexandre P Magalhaes2, Rene Buschow3

  • 1Chromatin Structure and Function Group, Max Planck Institute for Molecular Genetics, 63-73 Ihnestrasse, Berlin14195, Germany.

Nucleic acids research
|July 2, 2025
PubMed
概括
此摘要是机器生成的。

PHF13蛋白质的寡合化会影响染色体结构. 它的有序区域促进染色质的紧缩,而无序区域驱动类似液体的凝聚物,揭示了调节表观遗传功能的平衡.

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Genome-wide Analysis using ChIP to Identify Isoform-specific Gene Targets
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相关实验视频

Last Updated: Sep 17, 2025

Analysis of Histone Antibody Specificity with Peptide Microarrays
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Published on: August 1, 2017

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Immunofluorescent Staining for Visualization of Heterochromatin Associated Proteins in Drosophila Salivary Glands
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Immunofluorescent Staining for Visualization of Heterochromatin Associated Proteins in Drosophila Salivary Glands

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Genome-wide Analysis using ChIP to Identify Isoform-specific Gene Targets
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Genome-wide Analysis using ChIP to Identify Isoform-specific Gene Targets

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科学领域:

  • 表观遗传学和染色体生物学
  • 分子细胞生物学 分子细胞生物学

背景情况:

  • PHF13 (对状主体13) 是一种表观遗传阅读器,可以调节染色体过程.
  • 异常的PHF13调节与各种癌症和上皮转移到介质细胞的转变有关.
  • 了解PHF13的内在调节对于其在染色质动态中的作用至关重要.

研究的目的:

  • 研究调节PHF13染色质亲和力和功能的内在机制.
  • 阐明PHF13的结构如何影响其与染色质的相互作用.

主要方法:

  • 通过有序和无序区域分析PHF13的寡合化.
  • 使用光学显微镜评估色素紧缩.
  • 研究相隔行为 (PPPS和LLPS).

主要成果:

  • 通过有序域的PHF13寡合化增加了染色质的度,促进了聚合物-聚合物相分离 (PPPS) 和染色质的不可接近性.
  • 过度表达PHF13 (3-5倍) 会导致全球染色质的紧缩,这取决于有序的区域.
  • 通过无序区域的PHF13自我结合降低了染色质亲和力,形成液态液相分离 (LLPS) 凝结物,并影响基因表达.

结论:

  • PHF13在有序和无序区域之间表现出平衡,这决定了它的染色质相互作用模式.
  • PHF13可以在PPPS和LLPS状态之间过渡,动态调节色素结构和功能.
  • 这种双相分离能力为表观遗传调节和癌症生物学提供了新的见解.