相关实验视频

Updated: Sep 19, 2025

Author Spotlight: Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates

Author Spotlight: Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates

Published on: May 12, 2023

欧色素和异色素:对DNA可访问性和转录的影响

Katsuhiko Minami¹, Adilgazy Semeigazin¹, Kako Nakazato¹

¹Genome Dynamics Laboratory, National Institute of Genetics, ROIS, Mishima, Shizuoka 411-8540, Japan; Graduate Institute for Advanced Studies, SOKENDAI, Mishima, Shizuoka 411-8540, Japan.

Journal of molecular biology

|June 7, 2025

概括

染色质结构,从 euchromatin 到 heterochromatin,影响 DNA 的可访问性. 核细胞体运动从液体状转变为凝状,影响蛋白质对转录等基本DNA过程的访问.

科学领域:

分子生物学分子生物学
遗传学遗传学是一个
生物物理学的生物物理.

背景情况:

染色体组织和动态对于调节真核生物中的基因转录至关重要.
基因组DNA被包装成核体,形成密集的染色体域 (euchromatin和 heterochromatin),具有不同的物理特性和功能.
染色体的可访问性显著影响了DNA相关过程的调节.

研究的目的:

为了审查euchromatin和heterochromatin之间的物理差异.
讨论核细胞的行为如何影响蛋白质进入染色体内的DNA点.
探索对包括转录在内的基本DNA交易过程的影响.

主要方法:

利用复制依赖的组分蛋白 (Repli-Histo) 标签来根据DNA复制时间标记核体.
分析了从 euchromatin 到 heterochromatin 的四个不同的染色质类的核细胞行为.
研究了不同染色体环境中的核体的物理性质和动态.

主要成果:

核细胞运动逐渐变得越来越受限制,从欧克罗马到异性色素.
尤克罗马丁核细胞体表现出类似液体的波动,而异色色素核细胞体则受到高度约束,类似于凝状的状态.
核酶体动态中的这些物理差异与染色质可访问性相关.

结论:

染色质的物理状态,以核动力学为特征,直接影响DNA对蛋白质的可访问性.
了解核细胞的行为是理解转录调节和其他DNA交易过程的关键.
从液态转变为凝状的染色质状态对基因组功能和调节有重大影响.

关键词:

染色质的动态染色质的动态欧克罗马丁是什么意思异性染色是一种异性染色.单核酶体成像技术单核酶体成像转录转录是一种转录.

更多相关视频

Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers

Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers

Published on: September 20, 2018

Formaldehyde-assisted Isolation of Regulatory Elements to Measure Chromatin Accessibility in Mammalian Cells

Formaldehyde-assisted Isolation of Regulatory Elements to Measure Chromatin Accessibility in Mammalian Cells

Published on: April 2, 2018

相关概念视频

Euchromatin

Euchromatin

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...

Heterochromatin

Heterochromatin

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...

DNA Packaging

DNA Packaging

Position-effect Variegation

Position-effect Variegation

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.

Spreading of Chromatin Modifications

Spreading of Chromatin Modifications

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...

Chromatin Position Affects Gene Expression

Chromatin Position Affects Gene Expression

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)
The 3-dimensional positioning of chromatin in the nucleus influences the...