CARD15/NOD2 polymorphisms are associated with severe pulmonary sarcoidosis
H Sato1, H R T Williams, P Spagnolo
1Clinical Genomics Group Royal Brompton Hospital and NHLI, Imperial College, 1B Manresa Road, London SW3 6LR, UK. h.sato@imperial.ac.uk
Genetic variations in Caspase recruitment domain (CARD)15 influence sarcoidosis severity and lung function. Specific CARD15 polymorphisms, particularly 2104T, are linked to advanced disease stages and reduced lung capacity, with a combined effect with CCR5 haplotype.
Area of Science:
- Immunogenetics
- Pulmonary Medicine
- Systemic Inflammatory Diseases
Background:
- Sarcoidosis and Crohn's disease are granulomatous inflammatory conditions.
- CARD15 is a known susceptibility gene for Crohn's disease.
- CCR5 gene is associated with pulmonary sarcoidosis and perianal Crohn's disease.
Purpose of the Study:
- To investigate the association between CARD15 polymorphisms, CCR5 haplotype, and sarcoidosis subtypes.
- To correlate genetic findings with pulmonary function and radiographic outcomes.
Main Methods:
- Genotyping of CARD15 and CCR5 polymorphisms in 185 Caucasian sarcoidosis patients and 347 controls.
- Analysis of associations with serial pulmonary function tests and chest radiographs.
Main Results:
- No overall difference in CARD15 genotypes between sarcoidosis patients and controls.
- CARD15 2104T polymorphism associated with radiographic stage IV disease at 4-year follow-up.
- Combined CARD15 2104T and CCR5 HHC haplotype linked to stage IV disease at presentation.
- 2104T associated with worse FEV1; 1761G associated with better lung function.
Conclusions:
- Demonstrates association between CARD15 polymorphisms and specific sarcoidosis phenotypes for the first time.
- Highlights an additive effect of CARD15 2104T and CCR5 HHC haplotype on disease severity.
- Suggests a genetic basis for distinct sarcoidosis manifestations and progression.
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