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Fluorescence detection methods for microfluidic droplet platforms
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A high-throughput drop microfluidic system for virus culture and analysis.

Audrey E Fischer1, Susan K Wu1, Jody B G Proescher1

  • 1The Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723, USA.

Journal of Virological Methods
|December 20, 2014
PubMed
Summary

This study introduces a microfluidic system for studying RNA virus evolution at the single-event level. The system effectively analyzes viral escape from antibodies, revealing insights into viral replication and mutant isolation.

Keywords:
Antibody neutralizationEvolutionMicrofluidicsMurine norovirus

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Area of Science:

  • Virology
  • Microfluidics
  • Evolutionary Biology

Background:

  • RNA viruses evolve rapidly due to high mutation rates and short replication cycles.
  • Studying viral evolutionary processes requires advanced tools for high-throughput culture and phenotypic analysis.

Purpose of the Study:

  • To develop and validate a microfluidic system for single-event, massively parallel analysis of virus-cell interactions.
  • To investigate murine norovirus (MNV-1) evolution, specifically its escape from antibody neutralization.
  • To assess the replicative capacity of individual viral particles under antibody stress.

Main Methods:

  • Co-encapsulation of MNV-1 particles with RAW 264.7 cells in picoliter aqueous drops using flow focusing microfluidics.
  • Monitoring viral replication and titering at low multiplicity of infection (MOI).
  • Evaluating viral escape from a specific neutralizing monoclonal antibody (clone A6.2) using wild-type and mutant viruses.

Main Results:

  • The microfluidic system demonstrated significant viral titer increase, peaking at 18 hours post-encapsulation.
  • The system successfully evaluated MNV-1 escape from antibody neutralization, validated with viral point mutants.
  • Single viral particles under antibody stress showed replicative capacity nearly equivalent to their genome count, even with lower fitness.

Conclusions:

  • The developed microfluidic system is effective for studying virus-cell interactions and viral evolutionary dynamics at a single-event level.
  • This platform facilitates the analysis of viral escape mechanisms from neutralizing antibodies.
  • The findings suggest the microfluidics system's utility in isolating viral mutants that overcome evolutionary pressures like antibody neutralization.