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相关概念视频

Heterochromatin02:38

Heterochromatin

11.8K
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...
11.8K
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
Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

7.1K
The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
7.1K
Euchromatin01:01

Euchromatin

6.8K
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...
6.8K
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
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

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相关实验视频

Updated: Jun 15, 2025

A Screening Method for Identification of Heterochromatin-Promoting Drugs Using Drosophila
06:22

A Screening Method for Identification of Heterochromatin-Promoting Drugs Using Drosophila

Published on: March 12, 2020

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涉及异色染色体功能的基因的普遍快速进化.

Leila Lin1, Yuheng Huang1, Jennifer McIntyre1

  • 1Department of Ecology and Evolutionary Biology, University of California, Irvine, CA, USA.

Molecular biology and evolution
|August 27, 2024
PubMed
概括
此摘要是机器生成的。

调节异色染色素的基因迅速演变,与基于Polycomb的染色素中的基因不同. 这种由选择驱动的快速进化与异性染色有关.

关键词:
在军备竞赛中.异性染色是一种异性染色.阳性选择是一种积极的选择.蛋白质的进化 蛋白质的进化一些重复的序列.可转移的元素可以转移.

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Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
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Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers

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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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相关实验视频

Last Updated: Jun 15, 2025

A Screening Method for Identification of Heterochromatin-Promoting Drugs Using Drosophila
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A Screening Method for Identification of Heterochromatin-Promoting Drugs Using Drosophila

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Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
10:28

Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers

Published on: September 20, 2018

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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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科学领域:

  • 基因组学就是基因组学.
  • 进化生物学 进化生物学
  • 分子生物学分子生物学

背景情况:

  • 异染色素是一种基因贫乏和重复丰富的基因组区域,对基因组稳定性,染色体组织和抑制可转移元素至关重要.
  • 尽管它很重要,但一些参与异性染色体调节的基因表现出快速进化,与高度保护的期望形成鲜明对比.

研究的目的:

  • 调查涉及异种染色质功能的基因的进化模式,跨越多种不同的进化时间尺度在Drosophila.
  • 为了确定与其他染色质调节剂相比,快速进化是否是异染色质相关基因的一般特征.

主要方法:

  • 编制了106个与异色素蛋白功能相关的候选基因的综合清单.
  • 分析了这些基因的进化变化,包括氨基酸替代和基因拷贝数变化.
  • 与参与Polycomb-based压制色素的基因进行比较的进化速度.

主要成果:

  • 调节异色素的基因表现出明显更频繁的进化变化 (氨基酸替代,基因拷贝数量变化),而不是那些涉及到基于Polycomb的抑制色素的基因.
  • 这些蛋白质的结构域和内在无序区域都受到积极选择的影响,而净化选择可能会保留无序区域.
  • 观察到这些基因的进化速率与可转移元素的基因组丰度之间存在负相关性.

结论:

  • 异性染色素相关基因的快速演变是异性染色素独特功能的固有后果.
  • 这项研究提出了一个模型,即快速转移的元素进化可能是异色染色体基因进化的结果,而不是原因.
  • 提供了关于异染色体相关基因的进化及其独特进化轨迹的影响因素的广泛视角.