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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...
Small interfering RNAs (siRNA)02:30

Small interfering RNAs (siRNA)

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...

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Enhanced Northern Blot Detection of Small RNA Species in Drosophila Melanogaster
09:39

Enhanced Northern Blot Detection of Small RNA Species in Drosophila Melanogaster

Published on: August 21, 2014

Diverse small non-coding RNAs in RNA interference pathways.

Liande Li1, Yi Liu

  • 1Department of Physiology, The University of Texas Southwestern Medical Center, Dallas, TX, USA. liande.li@utsouthwestern.edu

Methods in Molecular Biology (Clifton, N.J.)
|July 13, 2011
PubMed
Summary
This summary is machine-generated.

Eukaryotic RNA interference pathways utilize diverse small RNAs, including microRNAs (miRNAs) and Piwi-interacting RNAs (piRNAs), to regulate gene expression. This review covers their characteristics, biogenesis, and functions.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Eukaryotic RNA interference (RNAi) pathways involve numerous small non-coding RNAs.
  • These small RNAs associate with Argonaute proteins to modulate gene expression and genomes.
  • Key classes include Dicer-dependent microRNAs (miRNAs) and small interfering RNAs (siRNAs), and Dicer-independent Piwi-interacting RNAs (piRNAs).

Purpose of the Study:

  • To review and summarize the diverse classes of eukaryotic small RNAs.
  • To provide an overview of their characteristics, biogenesis, and functions.
  • To highlight recently identified small RNAs within these pathways.

Main Methods:

  • Literature review of small non-coding RNA research.
  • Synthesis of information on miRNA, siRNA, and piRNA pathways.
  • Focus on comparative analysis of small RNA classes.

Main Results:

  • Detailed characterization of Dicer-dependent (miRNA, siRNA) and Dicer-independent (piRNA) small RNAs.
  • Explanation of the regulatory roles of small RNAs in gene expression and genome maintenance.
  • Identification of common and distinct features across various small RNA classes.

Conclusions:

  • Small non-coding RNAs are crucial regulators in eukaryotes.
  • Understanding their diverse mechanisms is key to deciphering gene regulation.
  • Ongoing research continues to uncover novel small RNAs and their functions.