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Identification of Equine Arteritis Virus Immunodominant Epitopes Using a Peptide Microarray.

Jo Mayers1, David Westcott2, Falko Steinbach2,3

  • 1Surveillance and Laboratory Services Department, Animal Health and Veterinary Laboratories Agency, Staplake Mount, Devon EX6 8PE, UK.

Viruses
|September 23, 2022
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Summary

A peptide microarray identified key epitopes for Equine arteritis virus (EAV) antibody detection. Combining seven specific peptides achieved high diagnostic sensitivity and specificity for EAV, though multiple sequences are needed for comprehensive testing.

Keywords:
ELISAEquine arteritis virusequine viral arteritismicro-arraypeptide

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Area of Science:

  • Veterinary Virology
  • Immunology
  • Biotechnology

Background:

  • Equine arteritis virus (EAV) causes significant economic losses in the equine industry.
  • Accurate serological detection of EAV is crucial for disease control and management.
  • Existing diagnostic methods may have limitations in sensitivity or strain coverage.

Purpose of the Study:

  • To develop and evaluate a peptide microarray for identifying immunodominant epitopes of EAV.
  • To assess the diagnostic potential of identified epitopes for detecting EAV antibodies.
  • To determine the feasibility of a multi-peptide approach for comprehensive EAV serology.

Main Methods:

  • Design and synthesis of 1250 peptides covering the entire EAV Bucyrus sequence.
  • Utilization of the PEPperCHIP® microarray platform for peptide synthesis and spotting.
  • Screening of 28 EAV-positive serum samples against the peptide microarray.

Main Results:

  • Ninety-seven peptides (7.76%) showed reactivity with EAV-positive samples.
  • Seven peptides demonstrated consistent reactivity above the cut-off, with five located in the GP5 protein and two in ORF1 replicase regions (NSP2, NSP10).
  • Individual peptide sensitivity ranged from 5% to 55%, but the combined panel achieved 90% sensitivity and 100% specificity.

Conclusions:

  • A subset of seven peptides shows diagnostic potential for EAV antibody detection.
  • A comprehensive serological test requires multiple peptide sequences to address EAV strain diversity and host immune responses.
  • Peptide microarrays offer a promising platform for developing improved EAV diagnostics.