alexa FCRL3 –169C C Genotype Is Associated with Anti-citrullinated Protein Antibody-positive Rheumatoid Arthritis and with Radiographic Progression
Immunology

Immunology

Journal of Clinical & Cellular Immunology

Author(s): MARTHE T MAEHLEN

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Objective.

Studies of Caucasian populations have shown conflicting results concerning the association between a promoter polymorphism –169T>C of the Fc receptor-like 3 (FCRL3) gene and rheumatoid arthritis (RA). It is unknown whether FCRL3 is associated with autoantibody status and disease severity. We investigated associations between FCRL3 –169T>C and autoantibody status and joint damage in patients with RA.

Methods.

A total of 652 Norwegian patients with RA from 2 cohorts and 981 Norwegian controls, previously genotyped for FCRL3 –169T>C (rs7528684), were studied. Data on anticitrullinated protein antibodies (ACPA) and rheumatoid factor (RF) were available. The EURIDISS cohort (disease duration ≤ 4 yrs at baseline) was followed longitudinally, with assessment of radiographic hand damage at baseline and after 10 years (n = 117) according to the van der Heijde-modified Sharp score.

Results.

We found significant associations with ACPA-positive RA for both the C allele (OR 1.28, 95% CI 1.08–1.52, p = 0.004) and the C/C genotype (OR 1.57, 95% CI 1.18–2.10, p = 0.002). Similar associations were seen with RF-positive RA. No association was found with ACPA-negative or RF-negative RA. The C/C genotype was found to be associated with 10-year radiographic progression in multivariate linear and logistic regression analyses, after adjustment for ACPA, erythrocyte sedimentation rate, age, and sex.

Conclusion.

The promoter polymorphism of FCRL3 was associated with autoantibody-positive RA. Despite the low number of patients, the C/C genotype of the FCRL3 polymorphism consistently and independently predicted radiographic progression. These findings suggest that FCRL3 is involved in both disease susceptibility and progression.

This article was published in The Journal of Rheumatology and referenced in Journal of Clinical & Cellular Immunology

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