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An Adoptive Transfer Model of Rheumatoid Arthritis in Mice
Published on: June 6, 2025
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Comprehensive Profiling of the Rheumatoid Arthritis Antibody Repertoire
Ken C Lo1, Eric Sullivan1, Ryan M Bannen1
1Roche Sequencing Solutions, Madison, Wisconsin.
Arthritis & Rheumatology (Hoboken, N.J.)
|August 27, 2019
Summary
This study developed a novel diagnostic biomarker for rheumatoid arthritis (RA) using a high-density peptide array. The new assay identifies RA-specific epitopes, offering high sensitivity and specificity comparable to existing tests.
Area of Science:
- Immunology
- Proteomics
- Biomarker Discovery
Background:
- Autoantibodies against citrullinated proteins are key biomarkers in rheumatoid arthritis (RA), present in 64-89% of patients.
- Existing diagnostic methods have limitations, necessitating the development of more comprehensive and accurate assays.
Purpose of the Study:
- To create an unbiased, comprehensive profile of serum antibodies against the human proteome in RA patients.
- To identify novel RA-specific epitopes and develop a new diagnostic biomarker using a high-density peptide array.
Main Methods:
- Utilized a high-density peptide array (>4.6 million peptides) representing the entire human proteome, including citrullinated and homocitrullinated forms.
- Serum samples from RA patients and controls were profiled to identify RA-specific epitopes.
- An 8-epitope diagnostic biomarker was constructed and validated in independent cohorts.
Main Results:
- The 8-epitope diagnostic biomarker demonstrated high diagnostic performance, with 96.6% specificity and 92.1% sensitivity in the initial cohort.
- Validation cohort results showed 94.4% specificity and 85% sensitivity.
- The biomarker's performance favorably compared to the Abnova cyclic citrullinated peptide 2 (CCP2) assay.
Conclusions:
- Comprehensive antibody profiling via high-density peptide array identified novel RA-specific epitopes.
- A new diagnostic biomarker was constructed, exhibiting specificity and sensitivity comparable to or exceeding current assays like the Abnova CCP2 assay.
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