KSHV编码的vIRF3与细胞IRF4合作,通过复杂的DNA元素驱动超级增强器活动
bioRxiv : the preprint server for biology
|August 20, 2025
概括
卡波西的肉瘤相关疹病毒 (KSHV) 瘤蛋白vIRF3通过将复杂的DNA元素与细胞IRF4结合来激活瘤性超级增强剂 (SE). 这种相互作用对于原发性输出淋巴瘤 (PEL) 细胞存活和瘤基因激活至关重要.
科学领域:
- 在瘤学瘤学.
- 病毒学 病毒学
- 分子生物学分子生物学
背景情况:
- 卡波西的肉瘤相关疹病毒 (KSHV) 蛋白vIRF3对于原发性输液淋巴瘤 (PEL) 细胞存活至关重要.
- vIRF3与细胞IRF4合作,激活驱动MYC和IRF4等瘤基因的超级增强剂 (SE).
研究的目的:
- 为了确定vIRF3/IRF4合作所涉及的特定DNA序列.
- 阐明vIRF3和IRF4在PEL细胞中激活瘤性SE的机制.
主要方法:
- 在IRF4-SE中对vIRF3/IRF4响应区域进行系统地绘制地图.
- 已识别的DNA基因的功能分析,包括AP1和IRF相关的部位.
- 检测DNA拉下测试以确认蛋白质-DNA相互作用.
主要成果:
- 在IRF4-SE中,一个复杂的~83bp区域被确定为vIRF3/IRF4合作激活的关键区域.
- 通过vIRF3介导的激活需要一个AP1位点,而vIRF3/IRF4合作则取决于IRF4的DNA结合和与IRF相关的新型动机.
- 这些动机虽然是必要的,但单独是不够的,这表明需要用于SE激活的扩展复合元件.
- DNA pulldown证实了vIRF3和IRF4与IRF4-SE中确定的动机结合.
- 在PEL MYC-SE中发现了类似的扩展响应元件.
结论:
- vIRF3通过利用具有独特IRF4结合配置的复杂遗传元素来激活瘤性SE.
- 这些发现有助于更好地理解vIRF3和IRF4在KSHV驱动的瘤发生中的作用.
- 这项研究揭示了病毒瘤蛋白和宿主因子对SE调节的新机制.
相关概念视频
Cooperative Binding of Transcription Regulators
6.5K
Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome. Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form...
6.5K
Eukaryotic Transcription Activators
11.2K
Transcription activators are proteins that promote the transcription of genes from DNA to RNA. In most cases, these proteins contain two separate domains ‒ a domain that binds to DNA and a domain for activating transcription; however, in some cases, a single domain is responsible for both binding and activation of transcription, as seen in the glucocorticoid receptor and MyoD.
The binding domains are capable of recognizing and interacting with regulatory sequences on the DNA. These...
The binding domains are capable of recognizing and interacting with regulatory sequences on the DNA. These...
11.2K
Co-activators and Co-repressors
2.4K
2.4K
Eukaryotic Transcription Inhibitors
10.0K
Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
Eukaryotic transcription inhibitors usually contain two distinct domains, a...
Eukaryotic transcription inhibitors usually contain two distinct domains, a...
10.0K
Prokaryotic Transcriptional Activators and Repressors
21.8K
The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...
Transcription of prokaryotic...
21.8K
General Transcription Factors
5.5K
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
5.5K


