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Virus-like Particles: Measures and Biological Functions.

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Virus-like particles (VLPs) are non-infectious viral mimics. This review explores methods to count VLPs and their roles in viral infections and potential as therapeutics.

Keywords:
cell killing particlesclonogenic assayco-infectioncoulter countingdefective interfering particlesdefective viral genomesflow virometrymultiplicity of infectionplaque forming unitresistive pulse sensingsemi-infectious particlestransmission electron microscopyvirus-like particles

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Area of Science:

  • Virology
  • Molecular Biology
  • Immunology

Background:

  • Virus-like particles (VLPs) share structural and molecular characteristics with infectious viruses but cannot replicate independently.
  • Historically, non-infectious particles were quantified indirectly through ratios with infectious viral particles (e.g., plaque-forming units).
  • VLPs can influence viral dynamics, immune responses, and disease progression through various mechanisms, including interference and immune modulation.

Purpose of the Study:

  • To review established and novel methods for quantifying virus-like particles.
  • To characterize the diverse biological functions of virus-like particles and their associated defective genomes.
  • To critically assess the evidence for defective interfering virus genomes and their therapeutic potential.

Main Methods:

  • Review of literature on microscopy and plaque assays for particle enumeration.
  • Analysis of studies investigating VLP interactions during co-infections.
  • Examination of research on defective interfering virus genomes and antiviral strategies.

Main Results:

  • Established methods for VLP quantification include microscopy and plaque assays, often yielding high particle-to-infectious unit ratios.
  • VLPs exhibit significant biological activities, including interference with viral replication and modulation of innate immunity.
  • Evidence suggests defective interfering virus genomes play roles in natural and clinical isolates, with potential therapeutic applications.

Conclusions:

  • There is an urgent need to better understand VLP and defective genome interactions with functional viruses during co-infections.
  • Understanding these interactions is crucial for comprehending viral disease transmission, severity, and persistence.
  • Further research into VLPs could lead to novel antiviral therapeutic strategies.