相关实验视频
Updated: May 11, 2026
14:40
Expression Analysis of Mammalian Linker-histone Subtypes
Published on: March 19, 2012
基因组少数报告:该变体不应被沉默
Fred van Leeuwen1, Daniel E Gottschling
1Division of Basic Sciences, Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue N, Seattle, WA 98109, USA.
Cell
|March 12, 2003
概括
基因组突变H2A.Z阻止沉默的染色蛋白进入转录活性的 euchromatin. 这一发现突显了H2A.Z在定义不同染色质域中的关键作用.
科学领域:
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 染色体生物学 染色体生物学
背景情况:
- 规范性基因素H2A是核细胞的基本组成部分,将DNA组织成染色体.
- 染色体结构是动态调节,以控制基因的可访问性和表达.
- 基因组变体,如H2A.Z,可以改变核细胞的稳定性和功能.
研究的目的:
- 为了研究基因组变异H2A.Z在 euchromatin中的作用.
- 确定H2A.Z如何影响静音染色蛋白蛋白的局部化.
- 阐明H2A.Z定义转录活性染色体域的机制.
主要方法:
- 利用技术来研究组合基因组变体到染色质.
- 采用方法来追踪核内沉默色素蛋白的运动.
- 分析了H2A.Z对染色质可访问性和蛋白质结合的影响.
主要成果:
- 已经证明,H2A.Z 加入到 euchromatin 中可以阻止静音色素蛋白的迁移.
- 表明H2A.Z对于保持转录活性区域的边界至关重要.
- 确定了H2A.Z作为建立和保存不同染色体域的关键因素.
结论:
- 基因组变异H2A.Z对于定义染色质域至关重要,因为它将静态染色质蛋白排除在活性区域之外.
- H2A.Z 作为一个屏障,确保转录活性的 euchromatin 的完整性.
- 这项研究为管理基因组组织和基因调节的表观遗传机制提供了新的见解.
相关概念视频
02:32Position-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.
02:32Histone Modification
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 deacetylase,...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
02:25Spreading 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 is an enzyme that can...
Writers
The writer is an enzyme that can...
02:30Histone Variants at the Centromere
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 variants are also...
02:38Heterochromatin
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 9th...
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 9th...
02:32Histone Modification
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 deacetylase,...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...