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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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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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Histone Variants at the Centromere02:30

Histone Variants at the Centromere

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Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3...
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Position-effect Variegation02:32

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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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Chromatin Modification in iPS Cells01:32

Chromatin Modification in iPS Cells

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Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
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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.
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Updated: May 13, 2025

Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
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设计催化剂启用区分基化

Tamiko Nozaki1, Mayu Onoda1, Misuzu Habazaki1

  • 1Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.

Journal of the American Chemical Society
|April 14, 2025
PubMed
概括

科学家开发了区域选择性催化剂,精确地将表观遗传标记 (基因组后翻译修饰) 添加到基因组H2B中. 这一突破使得基因调节和细胞功能的详细研究成为可能.

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科学领域:

  • 表观遗传学和分子生物学
  • 染色体生物学
  • 化学生物学

背景情况:

  • 基因组代码是一个基因组转化后修改 (PTM) 的系统,它控制着染色体结构和基因表达.
  • 要了解特定PTM的功能影响,需要精确地在活细胞中引入修饰的工具.

研究的目的:

  • 设计和开发针对特定素H2B氨酸残留的区域选择性催化剂.
  • 阐明基因组修饰催化剂的区域选择性设计原则.
  • 调查不同的基因组H2B乙化模式的细胞和分子后果.

主要方法:

  • 使用分子动力学模拟来分析催化剂-核酶相互作用.
  • 采用系统的实验优化来完善区域选择性的催化剂结构.
  • 进行生物化学和细胞测试以评估向酸的作用.

主要成果:

  • 开发了三种区域选择性催化剂,用于向素H2B上的不同氨酸残留物 (K43,K108,K120).
  • 确定区域选择性的关键设计原则,强调将非目标残留物排除在催化剂有效区域之外.
  • 证明H2B上的特定 lysine 乙化独特地影响核细胞相互作用分子结合,转录程序和细胞表型.

结论:

  • 建立了一个设计区域选择性酸酶催化剂的框架.
  • 进步了对特定基因质PTM如何调节基因表达和细胞过程的理解.
  • 提供了新的工具来剖析基因组代码在表观遗传学中的功能作用.