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Related Concept Videos

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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Viruses with RNA Genomes01:29

Viruses with RNA Genomes

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RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
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Subviral Agents01:29

Subviral Agents

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Subviral agents are infectious entities that resemble viruses but lack one or more viral components, such as a capsid or essential replication machinery. These agents include viroids, prions, and satellites, each possessing distinct structural and functional characteristics that influence their mode of infection and replication.Viroids are the simplest subviral agents, consisting of circular, single-stranded RNA molecules without a protein coat. They exclusively infect plants, relying entirely...
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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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Size and Structure of Viral Genomes01:26

Size and Structure of Viral Genomes

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Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
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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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Related Experiment Video

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High-throughput Screening for Broad-spectrum Chemical Inhibitors of RNA Viruses
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Small Molecules Targeting Viral RNA.

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  • 1Institute of Microbiology, University Hospital of Lausanne, University of Lausanne, 1011 Lausanne, Switzerland.

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|September 9, 2023
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RNA is a promising antiviral target. This review discusses methods for identifying RNA-targeting compounds and highlights molecules targeting viral RNA elements in SARS-CoV-2, HIV, and other viruses.

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Related Experiment Videos

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Using In Vitro and In-cell SHAPE to Investigate Small Molecule Induced Pre-mRNA Structural Changes
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Area of Science:

  • Virology
  • Medicinal Chemistry
  • Molecular Biology

Background:

  • Most current antivirals target viral proteins, leaving a gap in therapeutic options.
  • Viral RNA genomes contain structured elements crucial for viral replication, presenting a novel target class.
  • Targeting viral RNA offers a promising strategy to develop new antiviral therapies.

Purpose of the Study:

  • To review methodologies for identifying and developing RNA-targeting antiviral compounds.
  • To highlight existing small molecules that target specific viral RNA structures.
  • To discuss the potential of RNA as a therapeutic target for viral infections.

Main Methods:

  • Determination of RNA structures using biochemical and cellular methods.
  • In silico screening of compound libraries against RNA targets.
  • Phenotypic assays to evaluate viral inhibition by RNA-targeting compounds.
  • Review of literature on known small molecules targeting viral RNA elements.

Main Results:

  • Structured RNA elements in viral genomes are viable targets for antiviral drug discovery.
  • Methods for RNA structure determination and compound screening are advancing.
  • Several small molecules targeting SARS-CoV-2, HIV, and other viral RNA elements have been identified.

Conclusions:

  • Targeting viral RNA represents a significant and emerging strategy in antiviral drug development.
  • Further research into RNA-structure-based drug discovery holds great promise for combating viral diseases.
  • The development of novel antivirals targeting viral RNA elements is crucial for addressing current and future viral threats.