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CARD8 p.C10X polymorphism is associated with inflammatory activity in early rheumatoid arthritis

Alf Kastbom1, Martin Johansson, Deepti Verma

  • 1Division of Rheumatology, Linköping University Hospital, Linköping, Sweden. alf.kastbom@liu.se

Annals of the Rheumatic Diseases
|May 16, 2009
PubMed

Insights

Genetic variations in CARD8 (a inflammasome component) are linked to a more severe disease course in early rheumatoid arthritis (RA) patients. This finding was observed despite increased treatment, indicating a poorer prognosis for individuals with CARD8-X.

Area of Science:

  • Immunology
  • Genetics
  • Rheumatology

Background:

  • The inflammasome, including CARD8 and NLRP3, regulates interleukin-1beta production.
  • Genetic variations in inflammasome components may influence autoimmune disease susceptibility and severity.

Purpose of the Study:

  • To evaluate the impact of CARD8 and NLRP3 polymorphisms on rheumatoid arthritis (RA) susceptibility and disease severity.
  • To assess the association between specific CARD8 and NLRP3 genotypes and clinical outcomes in early RA patients.

Main Methods:

  • Genotyping for CARD8 p.C10X and NLRP3 p.Q705K in over 500 early RA patients and controls from northern Sweden.
  • Regular monitoring of patients over 2 years, assessing the 28-joint disease activity score (DAS28) and its components.
  • Comparison of clinical and radiological outcomes across different genotypes.

Main Results:

  • Patients with variant CARD8 alleles (CARD8-X) exhibited higher DAS28, tender joint count, and erythrocyte sedimentation rate.
  • CARD8-X was associated with increased utilization of anti-tumour necrosis factor therapy.
  • No significant association was found between CARD8/NLRP3 genotypes and radiological joint damage or RA susceptibility.

Conclusions:

  • Carriage of CARD8-X is associated with a more severe disease course in early rheumatoid arthritis.
  • Genetic factors related to CARD8 may predict a worse prognosis in RA patients.
Abstract

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