相关实验视频
Updated: May 7, 2026

11:09
Chromatin Isolation by RNA Purification (ChIRP)
Published on: March 25, 2012
通过复制合释放RNA Pol II的RNAi促进异色沉默
Mikel Zaratiegui1, Stephane E Castel, Danielle V Irvine
1Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724, USA.
Nature
|October 18, 2011
概括
在细胞分裂过程中,RNA干扰 (RNAi) 对于维持异染色素至关重要. 在裂变酵母中,共转录RNAi解决了转录和复制之间的冲突,确保了适当的异染色质蛋白遗传.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 雌性染色素,即真核染色体中紧密包装的DNA,对基因组稳定性至关重要.
- 它通过细胞分裂的继承依赖于RNA干扰 (RNAi) 来指导DNA复制过程中的基因组修饰.
研究的目的:
- 为了研究转录和DNA复制在Schizosaccharomyces pombe中 pericentromeric heterochromatin之间的相互作用.
- 阐明共转录RNA干扰在解决冲突和确保异染色质遗传中的作用.
主要方法:
- 研究了复制原点和非编码RNA在危中心体异色染色体中的排列.
- 观察到RNA干扰 (RNAi) 对RNA聚合酶II (Pol II) 释放和DNA复制进展的影响.
- 在没有RNAi的情况下分析了停滞叉维修的机制.
主要成果:
- 复制起源和非编码RNA在周边中心的异色素蛋白中的交替安排在转录和复制之间产生竞争.
- 同转录RNAi促进RNA聚合酶II (Pol II) 的释放,使得DNA复制由主要链聚合酶实现.
- 与复制分叉相关的基因组修饰酶传播异色素.
- 没有RNAi,停滞不前的复制分叉通过同源重组修复,绕过基因组修改.
结论:
- 同转录RNAi是解决异色染色体中转录复制冲突的关键机制.
- 这一过程对于异性染色素通过线粒分裂的准确遗传至关重要.
- 破坏RNAi导致替代修复途径,这些途径不维持异染色素结构.
相关概念视频
Types of RNA
Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
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...
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...
siRNA - Small Interfering RNAs
Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
Experimental RNAi
RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
Types of RNA
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA Performs Diverse...
RNA Performs Diverse...

