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Related Concept Videos

Viruses with RNA Genomes01:29

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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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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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A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
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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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Reverse Genetics to Engineer Positive-Sense RNA Virus Variants
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[Advances in the reverse genetics system for RNA viruses].

Tatsuya Suzuki1, Akatsuki Saito2

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Nihon Yakurigaku Zasshi. Folia Pharmacologica Japonica
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A new circular polymerase extension reaction (CPER) system simplifies reverse genetics for RNA viruses like SARS-CoV-2. This faster method aids in understanding viral evolution and drug resistance.

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Area of Science:

  • Virology
  • Molecular Biology
  • Genetics

Background:

  • RNA viruses, including flaviviruses and coronaviruses, cause significant infectious diseases.
  • Reverse genetics is crucial for studying viral pathogenicity and immune evasion.
  • Existing reverse genetics systems are often complex and time-consuming.

Purpose of the Study:

  • To introduce a novel and efficient reverse genetics system for RNA viruses.
  • To overcome the limitations of previous time-consuming and technically challenging methods.
  • To facilitate the study of viral evolution and the development of antiviral strategies.

Main Methods:

  • Development of a novel reverse genetics system named circular polymerase extension reaction (CPER).
  • CPER utilizes PCR-mediated assembly of DNA fragments encoding the entire viral genome.
  • Application of CPER for introducing specific mutations into flavivirus and SARS-CoV-2 genomes.

Main Results:

  • CPER significantly reduces the time required for genetic manipulation of RNA viruses.
  • The system enables efficient introduction of specific mutations into viral genomes.
  • Demonstrated applicability to flaviviruses and SARS-CoV-2.

Conclusions:

  • CPER offers a streamlined and effective approach to reverse genetics for RNA viruses.
  • This advancement will accelerate research into viral pathogenicity, evolution, and drug resistance.
  • The review discusses the future potential of CPER in RNA virus research.