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Viruses with RNA Genomes01:29

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...
Hepatitis01:25

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A Protocol for Analyzing Hepatitis C Virus Replication
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Hepatitis E virus replication involves alternating negative- and positive-sense RNA synthesis.

Satya Pavan Kumar Varma1, Amit Kumar, Neeraj Kapur

  • 1Department of Pathology, All India Institute of Medical Sciences, Ansari Nagar, New Delhi 110029, India.

The Journal of General Virology
|December 3, 2010
PubMed
Summary

Hepatitis E virus (HEV) replication involves cyclical bursts of RNA synthesis. A single subgenomic RNA is crucial for producing viral proteins, shedding light on HEV

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Published on: February 1, 2017

Area of Science:

  • Virology
  • Molecular Biology
  • Hepatitis Research

Background:

  • Hepatitis E virus (HEV) is a significant cause of epidemic and sporadic hepatitis.
  • The replication mechanisms and regulatory processes of HEV remain poorly understood.
  • Previous HEV studies relied on transient transfections and RNA transcripts (replicons).

Purpose of the Study:

  • To investigate HEV replicon replication dynamics in live cells.
  • To elucidate the role of subgenomic RNA in the HEV life cycle.
  • To visualize and quantify viral RNA replication over time.

Main Methods:

  • Utilized negative-sense strand-specific molecular beacons for live cell imaging.
  • Employed strand-specific real-time PCR to quantify intracellular viral RNA every 2 hours for 24 hours.
  • Constructed HEV replicons with fused fluorescent proteins (mCherry, EGFP) to ORF2 and ORF3 for protein analysis.
  • Used immunofluorescence to detect viral proteins pORF2 and pORF3.

Main Results:

  • Observed alternating, cyclical bursts of negative-sense and positive-sense RNA formation.
  • Live cell imaging showed maximal negative-sense RNA levels at 8 hours post-transfection, corroborating quantitative data.
  • Real-time PCR confirmed the presence of a single subgenomic RNA.
  • Demonstrated that both pORF2 and pORF3 proteins are produced from this single subgenomic RNA.

Conclusions:

  • HEV replication occurs in cyclical bursts.
  • A single subgenomic RNA plays a vital role in the HEV life cycle, enabling the production of essential viral proteins.
  • This study provides new insights into HEV replication dynamics and gene expression.