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相关概念视频

Histone Modification02:32

Histone Modification

13.0K
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...
13.0K
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
Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

8.2K
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...
8.2K
The Nucleosome Core Particle01:12

The Nucleosome Core Particle

849
Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...
849
Histone Variants at the Centromere02:30

Histone Variants at the Centromere

4.3K
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...
4.3K
Position-effect Variegation02:32

Position-effect Variegation

6.3K
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.
6.3K

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相关实验视频

Updated: May 30, 2025

Isolation and Cultivation of Neural Progenitors Followed by Chromatin-Immunoprecipitation of Histone 3 Lysine 79 Dimethylation Mark
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Isolation and Cultivation of Neural Progenitors Followed by Chromatin-Immunoprecipitation of Histone 3 Lysine 79 Dimethylation Mark

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基因组变异和DNA甲基化之间的复杂相互作用.

Alejandro Edera1, Leandro Quadrana1

  • 1Institute of Plant Sciences Paris-Saclay, Centre Nationale de la Recherche Scientifique, Institut National de la Recherche Agronomique, Université Evry, Université Paris-Saclay, 91405 Orsay, France.

Journal of experimental botany
|January 27, 2025
PubMed
概括

基因组变异和DNA甲基化是关键的表观遗传调节剂. 这篇评论探讨了核细胞重塑是如何协调植物中基因组交换和DNA甲基化以调节染色质的.

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.
  • 分子生物学分子生物学
  • 植物科学 植物科学

背景情况:

  • 核细胞是控制DNA可访问性的基本染色体单元.
  • 基因组变异和核细胞重塑影响表观遗传途径,包括DNA甲基化.
  • 基因甲基化作为一种稳定的表观遗传标记,抑制了可转移的元素.

研究的目的:

  • 审查最近在了解植物中的组素变异和DNA甲基化相互作用方面的进展.
  • 讨论染色质重塑在协调基因素交换和DNA甲基化中的作用.

主要方法:

  • 最近研究的文献综述.
  • 对植物表观遗传机制的分析.

主要成果:

  • 基因组突变和DNA甲基化在植物染色质调节中是紧密联系在一起的.
  • 染色体重塑对于协调基质子动态和DNA甲基化模式至关重要.

结论:

  • 了解基因组变异,DNA甲基化和染色质重塑之间的相互作用对于植物表观遗传学至关重要.
  • 这种协调提供了一个额外的染色质调节层,影响基因表达和基因组稳定性.
关键词:
阿拉比多普西斯 (Arabidopsis) 是一种植物.通过DNA甲基化.染色质可访问性 染色质可访问性染色体重塑 染色体重塑的方法表观遗传学是指表观遗传学.基因组变异的基因组变异链接器 基因组素

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