通过SRCAP和H2A.Z调节基因的机制
Armelle Tollenaere1, Enes Ugur2,3, Susanna Dalla Longa4
1Ecole Polytechnique Fédérale de Lausanne, School of Life Sciences, Institute of Bioengineering, Lausanne, Switzerland. armelle.tollenaere@epfl.ch.
Nature communications
|March 6, 2026
概括
与Snf2相关的CREBBP激活蛋白 (SRCAP) 改造器抑制了独立于H2A.Z的转录因子结合,而H2A.Z抑制了谱系特定的基因,保持了干细胞自我更新.
科学领域:
- * 分子生物学 * 分子生物学
- * 基因调控 * 基因调控
- * * 干细胞生物学
背景情况:
- *区分染色体组合作用与修饰复合体是基因调节的关键.
- * 基质子变体及其专用重塑器的功能在很大程度上仍未被探索.
- * 多能干细胞需要精确的基因调控来实现自我更新和可塑性.
研究的目的:
- * 在多能干细胞中剖析Snf2相关CREBBP激活蛋白 (SRCAP) 和H2A.Z的独特,细胞周期依赖的功能.
- * 区分SRCAP在基因调节中的H2A.Z依赖性和独立性作用.
- * 了解SRCAP-H2A.Z对如何协调干细胞维护的转录.
主要方法:
- *内源性SRCAP的急性降解,以观察动态的H2A.Z占用率变化.
- *为H2A.Z沉积设计了一个有缺陷的SRCAP突变.
- *分析SRCAP和H2A.Z功能在多能干细胞基因调节中的作用.
主要成果:
- * SRCAP在整个细胞周期中不断地被要求,影响H2A.Z占用.
- * SRCAP表现出重要的H2A.Z独立功能,通过硬质阻碍抑制先驱转录因子结合.
- * H2A.Z主要作为转录抑制剂,控制基因表达的功能.
结论:
- * SRCAP在广泛调节转录因子结合方面发挥着催化独立的作用.
- * SRCAP-H2A.Z复合体协调转录以保持多能性,自我更新和可塑性.
- * 这项研究阐明了染色体重塑剂和基因组变体在干细胞基因调节中的不同作用.
相关概念视频
Chromatin Structure Regulates pre-mRNA Processing
8.4K
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
The chromatin structure, especially...
8.4K
RNA Polymerase II Accessory Proteins
11.2K
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
11.2K
Co-activators and Co-repressors
8.8K
Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
8.8K
Co-activators and Co-repressors
3.2K
3.2K
Spreading of Chromatin Modifications
9.8K
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...
9.8K
Covalently Linked Protein Regulators
9.9K
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
These groups modify specific amino acids in a protein....
9.9K


