Related Experiment Video
Updated: May 19, 2026
10:21
Cell Based Assays of SINEUP Non-coding RNAs That Can Specifically Enhance mRNA Translation
Published on: February 1, 2019
New insights into siRNA amplification and RNAi
1Department of Molecular Biology, Massachusetts General Hospital, Boston, MA, USA.
RNA Biology
|August 4, 2012
Summary
RNA interference (RNAi) in C. elegans relies on RNA-dependent RNA polymerases (RdRPs) for potent gene silencing. The RDE-10/RDE-11 complex is crucial for RdRP activity and secondary small interfering RNA (siRNA) biogenesis.
Area of Science:
- Molecular Biology
- Genetics
- RNA Interference
Background:
- Gene silencing via RNA interference (RNAi) in Caenorhabditis elegans (C. elegans) is highly effective due to amplification by RNA-dependent RNA polymerases (RdRPs).
- RdRPs generate secondary small interfering RNAs (siRNAs) from target messenger RNA (mRNA) using primary siRNAs as templates.
- The genetic factors regulating RdRP activity remain largely uncharacterized.
Purpose of the Study:
- To investigate the genetic requirements for RNA-dependent RNA polymerase (RdRP) activity in C. elegans RNA interference.
- To elucidate the role of the RDE-10/RDE-11 complex in secondary small interfering RNA (siRNA) biogenesis.
Main Methods:
- RNA interference (RNAi) assays in wild-type and mutant Caenorhabditis elegans (C. elegans) strains.
- Analysis of small interfering RNA (siRNA) populations using molecular biology techniques.
- Genetic screening to identify factors involved in RNAi pathways.
Main Results:
- The RDE-10/RDE-11 complex interacts with primary siRNA-bound target mRNA and acts upstream of RNA-dependent RNA polymerases (RdRPs).
- Mutations in rde-10 or rde-11 completely abolish secondary small interfering RNA (siRNA) biogenesis, leading to a defective RNAi phenotype.
- The RDE-10/RDE-11 complex is also implicated in the endogenous RNAi pathway for targeting recently duplicated genes.
Conclusions:
- The RDE-10/RDE-11 complex is essential for RNA-dependent RNA polymerase (RdRP)-mediated amplification of RNA interference (RNAi) triggers.
- This complex plays a critical role in the production of secondary small interfering RNAs (siRNAs) in both exogenous and endogenous RNAi pathways.
- Understanding the RDE-10/RDE-11 complex provides insights into the amplification mechanisms of gene silencing in C. elegans.
Related Concept Videos
01:23RNA 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...
01:23RNA 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...
02:15Experimental 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...
03:21RNA-seq
RNA sequencing, or RNA-Seq, is a high-throughput sequencing technology used to study the transcriptome of a cell. Transcriptomics helps to interpret the functional elements of a genome and identify the molecular constituents of an organism. Additionally, it also helps in understanding the development of an organism and the occurrence of diseases.
Before the discovery of RNA-seq, microarray-based methods and Sanger sequencing were used for transcriptome analysis. However, while microarray-based...
Before the discovery of RNA-seq, microarray-based methods and Sanger sequencing were used for transcriptome analysis. However, while microarray-based...
02:30siRNA - 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...
01:20Types 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...