Autoantibody clusters in rheumatoid arthritis are not driven by antigen specificity or isotype
Authors' conclusion
Autoantibody clusters are most likely not driven by AMPA specificity or isotype profile, neither before nor at RA onset, but are instead determined by a broad variety of autoantibodies.
Study context
- Population
- Pre-symptomatic cases and established rheumatoid arthritis (RA)
- Exposure
- Pre-symptomatic vs RA
- Outcome
- Patterns in co-occurrence of antigen or isotype reactivity of AMPA and RF (clustering of autoantibody levels)
Methodological detailstwo cohorts (pre-symptomatic and RA), cluster analysis
- Two cohorts (pre-symptomatic and RA)
- Cluster analysis
Main finding
As reported in the abstract
- Anti-citrullinated protein antibodies (ACPA) IgG and rheumatoid factor (RF) IgA especially co-occurred with other autoantibodies, but no specific patterns emerged
- In both cohorts, clusters not determined by particular antigen reactivities or isotype
- Clusters driven by elevated levels of several different anti-modified protein antibodies (AMPA), with distinct AMPA high- and low-level clusters
Observational data: associations, not effects.
Further findings
Total IgG (1-year follow-up sera, RA subgroup)
- A broad IgG autoantibody profile was not accompanied by high total IgG levels
Original publication
Autoantibody clusters in rheumatoid arthritis are not driven by antigen specificity or isotype. RMD Open. Published 13 June 2025. doi:10.
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