Do Genetic Susceptibility Variants Associate with Disease Severity in Early Active Rheumatoid Arthritis?

J Rheumatol. 2015 Jul;42(7):1131-40. doi: 10.3899/jrheum.141211. Epub 2015 May 15.

Abstract

Objective: Genetic variants affect both the development and severity of rheumatoid arthritis (RA). Recent studies have expanded the number of RA susceptibility variants. We tested the hypothesis that these associated with disease severity in a clinical trial cohort of patients with early, active RA.

Methods: We evaluated 524 patients with RA enrolled in the Combination Anti-Rheumatic Drugs in Early RA (CARDERA) trials. We tested validated susceptibility variants - 69 single-nucleotide polymorphisms (SNP), 15 HLA-DRB1 alleles, and amino acid polymorphisms in 6 HLA molecule positions - for their associations with progression in Larsen scoring, 28-joint Disease Activity Scores, and Health Assessment Questionnaire (HAQ) scores over 2 years using linear mixed-effects and latent growth curve models.

Results: HLA variants were associated with joint destruction. The *04:01 SNP (rs660895, p = 0.0003), *04:01 allele (p = 0.0002), and HLA-DRβ1 amino acids histidine at position 13 (p = 0.0005) and valine at position 11 (p = 0.0012) significantly associated with radiological progression. This association was only significant in anticitrullinated protein antibody (ACPA)-positive patients, suggesting that while their effects were not mediated by ACPA, they only predicted joint damage in ACPA-positive RA. Non-HLA variants did not associate with radiograph damage (assessed individually and cumulatively as a weighted genetic risk score). Two SNP - rs11889341 (STAT4, p = 0.0001) and rs653178 (SH2B3-PTPN11, p = 0.0004) - associated with HAQ scores over 6-24 months.

Conclusion: HLA susceptibility variants play an important role in determining radiological progression in early, active ACPA-positive RA. Genome-wide and HLA-wide analyses across large populations are required to better characterize the genetic architecture of radiological progression in RA.

Keywords: GENETICS; HLA ANTIGENS; OUTCOME MEASURES; RADIOGRAPHY; RHEUMATOID ARTHRITIS.

Publication types

  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Alleles
  • Antirheumatic Agents / therapeutic use
  • Arthritis, Rheumatoid / diagnosis*
  • Arthritis, Rheumatoid / drug therapy
  • Arthritis, Rheumatoid / genetics*
  • Disease Progression
  • Female
  • Genetic Association Studies
  • Genetic Predisposition to Disease*
  • Genotype
  • HLA-DRB1 Chains / genetics
  • Humans
  • Male
  • Middle Aged
  • Models, Theoretical
  • Polymorphism, Single Nucleotide*
  • Severity of Illness Index

Substances

  • Antirheumatic Agents
  • HLA-DRB1 Chains