SWI/SNF PBAF复合物促进了镇压性染色质的REST占用
Elena Grossi1,2,3, Christie B Nguyen1,2,3,4, Saul Carcamo3,5
1Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
bioRxiv : the preprint server for biology
|September 4, 2024
概括
聚菌相关的BAF (PBAF) 染色体重塑复合物有助于使黑色素瘤中的神经元基因沉默. 失去ARID2会破坏PBAF,导致这些基因在患者中的表达增加.
科学领域:
- 染色体生物学 染色体生物学
- 癌症表观遗传学 癌症表观遗传学
- 基因调节的分子机制
背景情况:
- SWI/SNF染色体重塑剂存在于具有不同功能的独特复合体中.
- 像黑色素瘤中的ARID2一样,SWI/SNF子单元中的突变会改变染色质的可访问性.
- 癌症中PBAF,PRC2和转录因子之间的相互作用尚未完全理解.
研究的目的:
- 研究PBAF复合体在黑色素瘤表观基因组学中的作用.
- 了解ARID2突变如何影响黑色素状态和黑色素瘤中的基因表达.
- 阐明PBAF,PRC2和REST转录因子之间的功能关系.
主要方法:
- 在黑色素瘤和黑色素细胞中对SWI/SNF复合体进行全面的表观基因组分析.
- 时间解析测试以评估染色体重塑灵敏度.
- 在PBAF占据地区对转录因子结合 (REST) 的分析.
- 基因表达特征与ARID2突变状态在患者队列中的相关性.
主要成果:
- 确定了与PRC2和抑制性染色体共定位的PBAF专属区域.
- 与BAF站点相比,与PBAF结合的区域对ATPase介导的重塑的敏感性较低.
- 对于压制性转录因子REST,PBAF/PRC2结合的位点得到了丰富.
- 失去ARID2会破坏PBAF,损害REST结合,并导致突触/神经元基因的上调.
- 这种基因特征保留在具有ARID2突变的黑色素瘤患者中.
结论:
- PBAF在促进压缩色素的REST可访问性方面发挥着独特的作用.
- 黑色素瘤中的ARID2突变破坏了PBAF功能,导致异常的基因表达.
- 这些发现突出了黑色素瘤发病的新型表观遗传机制,具有潜在的治疗意义.
相关概念视频
Nucleosome Remodeling
9.0K
Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
9.0K
Heterochromatin
11.7K
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...
11.7K
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...
Writers
The writer...
8.2K
Chromatin Modification in iPS Cells
1.6K
Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
1.6K
Co-activators and Co-repressors
7.3K
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...
7.3K
Chromatin Position Affects Gene Expression
23.3K
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...
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the...
23.3K


