全基因组过度表达屏幕揭示了Trypanosoma brucei中的一个新的转录终止因子
bioRxiv : the preprint server for biology
|September 15, 2025
概括
在Trypanosoma brucei中过度表达Tb FOP会破坏转录终止,导致寄生虫死亡. 这项研究确定了Tb FOP作为一种新型的转录终止因子,影响了非洲试索症.
科学领域:
- 分子生物学分子生物学
- 寄生虫学的寄生虫学
- 遗传学 是一个遗传学.
背景情况:
- trypanosoma brucei 致使非洲试虫病,这是一个重要的人类健康问题.
- 了解T. brucei的基本细胞过程对于开发治疗方法至关重要.
- 基因过度表达屏幕是识别参与重要寄生虫功能的基因的宝贵工具.
研究的目的:
- 在T. brucei中识别过度表达会损害寄生虫生长的基因.
- 为了研究非特征化蛋白Tb FOP的功能.
- 阐明Tb FOP在转录和寄生虫生存能力中的作用.
主要方法:
- 在T. brucei. 过度表达图书馆屏幕.
- 对基因过度表达候选者的表型分析.
- Tb FOP蛋白域和功能的表征.
- 基因组转录模式和DNA修改的分析.
主要成果:
- 过度表达Tb FOP显著损害了T. brucei的生长.
- Tb FOP过度表达导致反意义转录的增加,特别是在转录终止站点 (TTS).
- 观察到的表型类似于转录终结复合体组件的缺陷和TTS染色体标记,包括J基DNA修饰.
结论:
- Tb FOP被确定为T. brucei.中的新型转录终止因子.
- Tb FOP可能与TTS相关的5-基甲基-dU (5hmU) 相互作用,可能会干扰终止因子功能.
- 过度表达的Tb FOP破坏了转录终止,导致广泛的缺陷,并导致三细胞死亡,提供潜在的治疗点.
相关概念视频
Transcription Attenuation in Prokaryotes
18.1K
Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure. Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
18.1K
General Transcription Factors
6.7K
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...
6.7K
Transcription Factors
82.3K
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...
82.3K
Eukaryotic Transcription Inhibitors
10.9K
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...
10.9K


