相关实验视频
Updated: Jun 24, 2026

09:40
RNAi Screening to Identify Postembryonic Phenotypes in C. elegans
Published on: February 13, 2012
与RNA干扰相关的基因和机制调节了控制C. elegans发育时间的小时间RNAs的表达
A Grishok1, A E Pasquinelli, D Conte
1Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, MA 01605, USA.
Cell
|July 20, 2001
概括
RNA干扰 (RNAi) 和内源基因调控共享一个共同的处理途径. 关键的RNAi通路基因,包括Dicer同源dcr-1和rde-1同源alg-1和alg-2,对于小时RNA (stRNA) 成熟和功能在Caenorhabditis elegans中至关重要.
科学领域:
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
- 发展生物学 发展生物学
背景情况:
- RNA干扰 (RNAi) 是一种保存的基因沉默机制,利用双链RNA (dsRNA) 触发信使RNA (mRNA) 降解.
- 小时RNAs (stRNAs),如lin-4和let-7在Caenorhabditis elegans中,通过指导转录后基因沉默来调节发育时间.
研究的目的:
- 研究RNAi通路基因在内源性stRNA的成熟和功能中的作用.
- 为了确定共享机器是否处理RNAi和发育调节的小RNA.
主要方法:
- 对Caenorhabditis elegans突变的遗传分析.
- 异常性缺陷的表型特征.异常性缺陷的表型特征.
- 评估lin-4和let-7 stRNA的处理和活性.
主要成果:
- 包括dcr-1 (Dicer同源) 和alg-1/alg-2 (rde-1同源) 在内的RNAi通路基因的失活,诱导了反映lin-4和let-7突变的异常表型.
- 发现dcr-1,alg-1和alg-2对于lin-4和let-7 stRNAs的成熟和生物活性是不可或缺的.
结论:
- 这些发现表明,RNAi机制对内源性调节性小RNAs的生物发生和功能至关重要.
- 一个共同的处理途径可能会产生指导RNA,这对于RNAi介导的基因沉默和发育过程中的内源基因调节都至关重要.
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...
Chromatin Structure Regulates pre-mRNA Processing
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
The chromatin structure, especially...
Regulation of Expression Occurs at Multiple Steps
Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
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...
Regulation of Expression at Multiple Steps
The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the addition of a...

