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Viruses with RNA Genomes

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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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

Updated: Jun 4, 2026

Reverse Genetics to Engineer Positive-Sense RNA Virus Variants
15:49

Reverse Genetics to Engineer Positive-Sense RNA Virus Variants

Published on: June 9, 2022

The reverse genetics applied to fish RNA viruses.

Stéphane Biacchesi1

  • 1Unité de Virologie et Immunologie Moléculaires, INRA, CRJ, 78352 Jouy-en-Josas, France. stephane.biacchesi@jouy.inra.fr.

Veterinary Research
|February 15, 2011
PubMed
Summary

Reverse genetics systems enable manipulation of fish RNA viruses, advancing understanding of viral diseases and paving the way for novel vaccines and gene vectors in aquaculture.

Area of Science:

  • Aquatic Virology
  • Molecular Biology
  • Fish Health Management

Background:

  • Aquaculture's rapid growth has led to increased viral disease outbreaks, causing significant economic losses.
  • Key problematic fish viruses include RNA viruses from genera like Novirhabdovirus, Aquabirnavirus, Alphavirus, and Betanodavirus.

Purpose of the Study:

  • To review recent advancements in utilizing reverse genetics systems for fish RNA viruses.
  • To highlight applications in understanding viral biology, host interactions, and developing biotechnological tools.

Main Methods:

  • Establishment of reverse genetics systems to recover infectious fish RNA viruses from cDNA.
  • Genetic manipulation of viral genomes using these systems.

Main Results:

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  • These systems facilitate detailed studies of viral protein function, virulence, and host specificity.
  • Successful application in developing live vaccines and gene vectors for aquaculture.

Conclusions:

  • Reverse genetics has revolutionized the study of fish RNA viruses.
  • This technology offers promising avenues for disease control and biotechnological innovation in aquaculture.