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Common functional polymorphisms in the cathepsin S promoter in Japanese subjects: Possible contribution to pulmonary emphysema

Background and objective:  Cathepsin S is involved in the pathogenesis of COPD in murine models overexpressing interferon (IFN)‐γ and IL‐13. It is widely accepted that genetic factors partly influence susceptibility to COPD; however, the association of genetic polymorphisms in the cathepsin S gene with COPD has not been reported previously. In this study, functional polymorphisms in the 5′‐flanking region of the human cathepsin S gene were identified and their association with COPD phenotypes was investigated.