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Related Concept Videos

RNA Interference01:23

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...
RNA Interference01:23

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...
Experimental RNAi02:15

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...
siRNA - Small Interfering RNAs02:30

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...
piRNA - Piwi-interacting RNAs02:57

piRNA - Piwi-interacting RNAs

PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
Types of RNA01:23

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...

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RNA interference: Systemic RNAi SIDes with endosomes.

Christian E Rocheleau1

  • 1Division of Endocrinology and Metabolism, Department of Medicine, McGill University and the Research Institute of the McGill University Health Centre, Montreal, Quebec H3A 0C7, Canada. christian.rocheleau@mcgill.ca

Current Biology : CB
|October 27, 2012
PubMed
Summary

Systemic RNA interference (RNAi) requires specific proteins to import silencing signals. This study investigates SID-5, an endosome-associated protein, as a candidate for exporting these crucial RNAi signals.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Systemic RNAi in C. elegans facilitates the intercellular spread of RNA silencing.
  • The import of silencing signals into cells requires the transmembrane proteins SID-1 and SID-3.
  • The mechanism of silencing signal export remains largely unknown.

Purpose of the Study:

  • To investigate the role of SID-5 in the export of silencing signals during systemic RNAi.
  • To determine if SID-5 functions in the intercellular transport of RNAi.

Main Methods:

  • Utilized Caenorhabditis elegans as a model organism.
  • Employed genetic and biochemical approaches to study SID-5 function.
  • Investigated protein localization and interactions related to endosomal pathways.

Main Results:

  • SID-5 is localized to endosomes, suggesting a role in intracellular trafficking.
  • Evidence indicates SID-5 is involved in the export of silencing signals.
  • SID-5 acts downstream or in parallel to SID-1/SID-3 import machinery.

Conclusions:

  • SID-5 is a key protein involved in the export of silencing signals for systemic RNAi.
  • This finding expands our understanding of the molecular mechanisms governing RNAi transport.
  • SID-5 represents a potential target for modulating RNAi-based applications.