截然不同的类型的薄膜相关的域是由抑制性组织蛋白甲基化的差异性模式定义的
Caden J Martin1, Elizabeth A Oser1, Prabakaran Nagarajan1
1Department of Biological Chemistry and Pharmacology, The Ohio State University, Columbus, Ohio 43210, USA.
Genome research
|August 5, 2025
概括
拉米纳相关域 (LADs) 是多样化的,根据特定的基因组修饰,它们被分为三个不同的组. 这一发现揭示了对基因组组织和基因调节的新见解.
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.
- 基因组学就是基因组学.
背景情况:
- 膜相关域 (LADs) 对于基因组组织和基因调节至关重要.
- 低发达国家与核边缘地区互动,被认为是压制性地区.
- 现有的研究表明,LADs内部存在显著的异质性,这挑战了统一结构的概念.
研究的目的:
- 调查LADs的结构和监管多样性.
- 根据其分子和表观遗传特征对LAD进行分类.
- 了解特定的组织蛋白修饰在LAD调节中的作用.
主要方法:
- 在小鼠胚胎纤维细胞 (MEF) 细胞系中,对B1层,CBX1 (HP1B) 和各种基因素修饰 (H3K9me3,H3K9me2,H3K27me3,H3K14ac,H3K27ac,H3K9ac) 的剖析.
- 基于这些配置特征的丰富性和分布,LADs的聚类.
- 对LAD边境特征的分析.
主要成果:
- LADs成功地被分为三个不同的组.
- 每个组都有独特的组合,包括基因组修饰和基因组特征.
- 一个特定的异染色素修饰 (H3K9me3,H3K9me2或H3K27me3) 定义了每个LAD组.
- LAD边界表现出独特的特征,包括H3K14ac.的丰富.
结论:
- 土地管理系统并不统一,其结构和监管方式有很大的差异.
- 基质子修饰,特别是H3K9me3,H3K9me2和H3K27me3,在定义LAD亚型和调节色素方面发挥着关键作用.
- 这些发现突显了核外围基因组组织的基础的复杂调节机制.
相关概念视频
02:38Heterochromatin
14.5K
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...
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...
14.5K
01:01Euchromatin
7.5K
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...
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
7.5K
02:32Histone Modification
14.0K
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...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
14.0K
02:25Spreading of Chromatin Modifications
8.5K
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...
Writers
The writer...
8.5K
03:17Inheritance of Chromatin Structures
6.6K
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...
6.6K
00:55Laminins are the Adhesive Proteins of Basal Lamina
2.3K
Laminins are heterotrimeric proteins with high molecular mass found in the extracellular matrix. Each laminin molecule is composed of three chains, viz. alpha, beta, and gamma, coded by five, four, and three paralogous genes, respectively. Laminins are categories based on the compositions of the three chains.
In humans, the five forms of alpha chains are LAMA 1, LAMA 2, LAMA 3, LAMA 4, and LAMA 5. The four forms of beta chains are LAMB 1, LAMB 2, LAMB 3, and LAMB 4. The three forms of gamma...
In humans, the five forms of alpha chains are LAMA 1, LAMA 2, LAMA 3, LAMA 4, and LAMA 5. The four forms of beta chains are LAMB 1, LAMB 2, LAMB 3, and LAMB 4. The three forms of gamma...
2.3K