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Deciphering the Autoantibody Response to the OJ Antigenic Complex.

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Summary

Myositis specific antibodies (MSA) detection can be challenging. Combining anti-IARS and anti-KARS antigens shows promise for improved anti-OJ antibody detection on automated platforms.

Keywords:
OJantisynthetase syndromeautoantibodiesmyositis

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Area of Science:

  • Immunology
  • Autoantibody Detection

Background:

  • Myositis-specific antibodies (MSA) are crucial diagnostic biomarkers for inflammatory myopathies.
  • Anti-OJ antibodies, associated with anti-synthetase syndrome (ASS), are rare and challenging to detect due to the OJ antigen's complex nature.
  • Current assays face challenges in selecting appropriate antigens for anti-OJ antibody detection.

Purpose of the Study:

  • To evaluate the diagnostic performance of combining anti-IARS and anti-KARS antigens for anti-OJ antibody detection using particle-based multi-analyte technology (PMAT).
  • To compare the sensitivity of detecting anti-OJ antibodies using different antigen targets (KARS, IARS, or combined) across two independent patient cohorts.

Main Methods:

  • Two independent cohorts of anti-OJ antibody-positive patients were analyzed (n=39 by LIA, n=15 by IP).
  • Samples were tested using PMAT with KARS and IARS as target antigens, both individually and combined.
  • Antibody reactivity was quantified using median fluorescence intensities.

Main Results:

  • Combining anti-IARS and anti-KARS antigens significantly improved anti-OJ antibody detection sensitivity, particularly in the IP-selected cohort (80.0% sensitivity).
  • In the LIA cohort, combined antigen detection yielded 35.9% sensitivity, while KARS alone detected 7.7% and IARS alone detected 17.9%.
  • In the IP cohort, KARS alone detected 40.0% and IARS alone detected 26.7%.

Conclusions:

  • The combination of IARS and KARS antigens offers a promising strategy for detecting anti-OJ antibodies.
  • This combined approach may enhance the accuracy and efficiency of anti-OJ antibody detection on automated platforms.
  • Further validation is warranted to establish this method as a reliable diagnostic tool for anti-synthetase syndrome.