Loci identified by genome-wide association studies influence different disease-related phenotypes in chronic obstructive pulmonary disease.

American Journal of Respiratory and Critical Care Medicine
Sreekumar G PillaiECLIPSE and ICGN Investigators

Abstract

Genome-wide association studies have shown significant associations between variants near hedgehog interacting protein HHIP, FAM13A, and cholinergic nicotinic acetylcholine receptor CHRNA3/5 with increased risk of chronic obstructive pulmonary disease (COPD) in smokers; however, the disease mechanisms behind these associations are not well understood. To identify the association between replicated loci and COPD-related phenotypes in well-characterized patient populations. The relationship between these three loci and COPD-related phenotypes was assessed in the Evaluation of COPD Longitudinally to Identify Predictive Surrogate End-point (ECLIPSE) cohort. The results were validated in the family-based International COPD Genetics Network (ICGN). The CHRNA3/5 locus was significantly associated with pack-years of smoking (P = 0.002 and 3 × 10⁻⁴), emphysema assessed by a radiologist using high-resolution computed tomography (P = 2 × 10⁻⁴ and 4.8 × 10⁻⁵), and airflow obstruction (P = 0.004 and 1.8 × 10⁻⁵) in the ECLIPSE and ICGN populations, respectively. However, variants in the IREB2 gene were only significantly associated with FEV₁. The HHIP locus was not associated with smoking intensity but was associated with FEV₁/FVC (P = 1.9 ×...Continue Reading

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