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Related Concept Videos

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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Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the...
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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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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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Bacteriophages, or phages, are viruses that specifically infect bacteria. Among them, T-even bacteriophages, such as T4, exhibit a well-characterized lytic replication cycle in Escherichia coli (E. coli). This process ensures the rapid proliferation of the virus while ultimately leading to the destruction of the bacterial host.Attachment and DNA InjectionThe infection process begins with the recognition and binding of the T4 phage to the E. coli cell surface. Tail fibers of the phage...
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Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...
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Related Experiment Video

Updated: May 5, 2026

Reverse Genetics Mediated Recovery of Infectious Murine Norovirus
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Norovirus gene expression and replication.

Lucy G Thorne1, Ian G Goodfellow1

  • 1Division of Virology, Department of Pathology, University of Cambridge, Addenbrooke's Hospital, Hills Road, Cambridge CB2 2QQ, UK.

The Journal of General Virology
|November 19, 2013
PubMed
Summary
This summary is machine-generated.

Noroviruses cause widespread gastroenteritis, but their life cycle remained unclear due to culturing difficulties. Recent advances in norovirus research have significantly improved understanding of viral gene expression and replication.

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Area of Science:

  • Virology
  • Molecular Biology
  • Infectious Diseases

Background:

  • Noroviruses are a leading cause of acute gastroenteritis globally.
  • The inability to culture human noroviruses (HuNVs) has historically limited understanding of their life cycle.
  • Significant technological advancements have recently improved norovirus research.

Purpose of the Study:

  • To review the current knowledge of the intracellular life cycle of noroviruses.
  • To emphasize the mechanisms of viral gene expression and genome replication.
  • To highlight recent progress in understanding norovirus biology.

Main Methods:

  • Utilizing a human norovirus (HuNV) replicon system.
  • Employing improved biochemical and cell-based assays.
  • Leveraging the discovery of a murine norovirus model for cell culture replication.

Main Results:

  • Enhanced understanding of norovirus genome translation and replication mechanisms.
  • Improved insights into norovirus interactions with host cell processes.
  • Progress in studying viral gene expression pathways.

Conclusions:

  • Technological advances have overcome previous limitations in norovirus research.
  • The molecular mechanisms of norovirus replication and gene expression are becoming clearer.
  • Further research promises deeper insights into norovirus pathogenesis and control.