分离因子促进了分裂酵母中的RNAi导向沉默
Elizabeth H Bayne1, Manuela Portoso, Alexander Kagansky
1Wellcome Trust Centre for Cell Biology and Institute of Cell Biology, School of Biological Sciences, University of Edinburgh, 6.34 Swann Building, Edinburgh EH9 3JR, UK.
概括
拼接因子中的缺陷,而不是拼接本身,会影响裂变酵母中中心体色素的siRNA生成. 这些因素与RNAi机械有关,有助于中心分子沉默.
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.
- 在RNA干扰过程中,RNA干扰
背景情况:
- 在裂变酵母中间体中,异色素的形成依赖于RNA干扰 (RNAi).
- 中心转录被加工成小干扰RNA (siRNA),指导RNA诱导的转录沉默 (RITS) 复合体.
- RITS的招募导致Clr4介导的素H3氨酸9甲基化和基因沉默.
研究的目的:
- 调查拼接因子在中心性异种色素蛋白形成和RNAi中的作用.
- 确定拼接本身或特定的拼接因子是否对siRNA生成至关重要.
主要方法:
- 在裂变酵母菌株中对siRNA生成的分析,其中存在拼接因子的缺陷.
- 通过各种分子测定来评估中心介质异色染色素完整性.
- 同免疫沉试验用于研究拼接因子,RITS组件 (Cid12) 和中心色素之间的物理相互作用.
主要成果:
- 特定的拼接因子缺陷,独立于拼接活动,受损的中心基siRNA生产.
- 在这些突变菌株中,中心基异色素蛋白完整性受到损害.
- 发现拼接因子在物理上与Cid12和中间体染色素有关.
结论:
- 剪接因子在中心分子的RNAi路径中发挥着直接作用.
- 结合体复合体可以作为siRNA生成的平台.
- 这种机制对于保持有效的中心分子重复静音和异色染色体稳定性至关重要.
相关概念视频
RNA Splicing
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
RNA Splicing
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
Pre-mRNA Processing: RNA Splicing
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
Alternative RNA Splicing
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
Alternative RNA Splicing
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
RNA Interference
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...


