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Related Experiment Video

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High-throughput Detection Method for Influenza Virus
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Fluorescence-based biosensors for West Nile virus detection.

Ana Belén Blázquez1, Juan Carlos Saiz1, Laura Herrero2,3

  • 1Department of Biotecnología, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA-CSIC), Madrid, Spain.

Virulence
|November 30, 2025
PubMed
Summary

New biosensors detect West Nile virus (WNV) by targeting its protease activity. These tools offer high specificity for WNV detection and show potential for diagnosing other flaviviruses, aiding in disease surveillance and control efforts.

Keywords:
ArbovirusesWest Nile virusantiviralsbiosensorsdiagnosisflaviviruses

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Area of Science:

  • Virology
  • Biotechnology
  • Epidemiology

Background:

  • Flaviviruses, including West Nile virus (WNV), are emerging global health threats, exacerbated by climate change and globalization.
  • Arthropod-borne flaviviruses cause significant human, animal, and zoonotic diseases, with WNV posing a particular challenge in Europe.
  • Antigenic cross-reactivity among flaviviruses complicates serological diagnosis, especially in regions with co-circulating strains.

Purpose of the Study:

  • To develop novel biosensors for the specific and sensitive detection of West Nile virus (WNV).
  • To create a diagnostic tool capable of distinguishing between different WNV lineages and potentially other flaviviruses.
  • To validate the utility of these biosensors in clinical and laboratory settings, including antiviral screening.

Main Methods:

  • Engineered WNV biosensors utilizing the enzymatic activity of the viral protease.
  • Incorporation of WNV-specific protease cleavage sites into the biosensor design.
  • Fluorescence-based detection techniques to quantify viral protease activity post-infection.

Main Results:

  • Biosensors demonstrated high specificity for WNV lineages 1 and 2, with low limits of detection (LODs) as low as 10-6 MOI at 72 hours post-infection.
  • The biosensors could detect other flaviviruses like dengue, Zika, and Usutu viruses, albeit with reduced sensitivity.
  • Validated assays showed comparable performance to existing systems in neutralization tests and antiviral screening.

Conclusions:

  • The developed WNV biosensors are highly specific and sensitive tools for detecting WNV infection.
  • These biosensors show promise for broader flavivirus detection and can serve as valuable clinical and laboratory diagnostic instruments.
  • The technology offers potential for improved surveillance and management of flaviviral diseases.