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Viral Recombination

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Updated: May 17, 2026

Generation of Escape Variants of Neutralizing Influenza Virus Monoclonal Antibodies
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Published on: August 29, 2017

Competition between influenza A virus genome segments.

Ivy Widjaja1, Erik de Vries, Peter J M Rottier

  • 1Virology Division, Department of Infectious Diseases and Immunology, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands.

Plos One
|October 17, 2012
PubMed
Summary

Influenza A virus genome segments compete for limited viral polymerases. This competition, influenced by segment features, likely regulates viral replication and transcription, especially early in infection.

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Area of Science:

  • Virology
  • Molecular Biology
  • Genetics

Background:

  • Influenza A virus (IAV) possesses a segmented negative-strand RNA genome.
  • The regulatory mechanisms balancing replication and transcription of IAV genome segments remain unclear.

Purpose of the Study:

  • To investigate the competition between IAV genome segments for viral polymerase resources.
  • To understand how segment characteristics influence this competition and viral gene expression.

Main Methods:

  • Development of a dual competition assay using luciferase-encoding reporter genome segments.
  • Co-transfection with plasmids encoding IAV polymerase subunits and nucleoprotein.
  • Analysis of reporter gene expression under varying segment amounts, UTRs, and segment lengths.

Main Results:

  • IAV genome segments compete for available viral polymerases, impacting reporter gene expression.
  • Competition is modulated by segment length, untranslated regions (UTRs), and inherent expression levels.
  • UTR panhandle-stabilizing mutations significantly enhanced segment competition.

Conclusions:

  • IAV genome segments engage in polymerase competition, affecting replication and transcription.
  • Segment length, coding region, and UTRs are key factors influencing competition.
  • This competition may be crucial for regulating viral gene expression, particularly during the early stages of infection.