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Related Concept Videos

RNA Interference01:23

RNA Interference

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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...
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Experimental RNAi02:15

Experimental RNAi

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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...
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Riboswitches01:56

Riboswitches

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Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
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Types of RNA01:23

Types of RNA

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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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siRNA - Small Interfering RNAs02:30

siRNA - Small Interfering RNAs

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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...
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Alternative RNA Splicing02:18

Alternative RNA Splicing

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Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
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A tudor domain protein, SIMR-1, promotes siRNA production at piRNA-targeted mRNAs in <i>C. elegans</i>.

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Small RNA-mediated genetic switches coordinate ALG-3/4 small RNA pathway function.

Trilotma Sen1, Cara McCormick1, Alicia K Rogers1

  • 1Department of Biology, University of Texas at Arlington, Arlington, TX 76019, USA.

Nucleic Acids Research
|July 5, 2024
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Summary

This study reveals a novel RNA interference (RNAi) to RNAi regulatory cascade in C. elegans. This mechanism ensures sperm fertility and thermotolerance by temporally controlling Argonautes expression during development and heat stress.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Developmental Biology

Background:

  • Gene regulatory networks require precise coordination for cellular functions.
  • RNA interference (RNAi) is a conserved gene regulation mechanism in metazoans.
  • Maintaining RNAi homeostasis across developmental stages and environmental changes is crucial.

Purpose of the Study:

  • To investigate the regulatory mechanisms controlling Argonautes ALG-3 and ALG-4 expression in C. elegans.
  • To elucidate the role of small interfering RNAs (siRNAs) in regulating these Argonautes.
  • To understand how this regulatory cascade contributes to sperm fertility and thermotolerance.

Main Methods:

  • Analysis of siRNA regulation of alg-3 and alg-4 genes.
  • Investigating the temporal expression patterns of ALG-3 and ALG-4.
  • Assessing the impact of this regulatory cascade on sperm fertility under heat stress.

Main Results:

  • The expression of Argonautes ALG-3 and ALG-4 is regulated by siRNAs.
  • A temporal gene switch mechanism, operated by siRNAs, controls Argonautes expression.
  • This RNAi-to-RNAi cascade is vital for coordinating ALG-3/4 pathway function, ensuring thermotolerant fertility.

Conclusions:

  • A novel RNAi-to-RNAi regulatory cascade maintains RNAi homeostasis during development and stress.
  • This mechanism ensures sperm fertility and thermotolerance by temporal control of Argonautes.
  • Conserved RNAi pathways in other species may employ similar regulatory architectures.