RESUMO
BACKGROUND: Psoriasis is a common multi-factorial skin disease, in which gene-gene and gene-environment interactions may affect the onset, manifestation and clinical course. OBJECTIVE: To investigate the underlying gene-environment interaction among several established susceptibility genes, cigarette smoking and alcohol intake. METHODS: Using a two-stage case-control design, we searched for pairwise interactions between cigarette smoking and alcohol intake respectively with 9 single nucleotide polymorphisms (SNPs) at ERAP1, PTTG1, CSMD1, GJB2, SERPINB8, ZNF816A and TNIP1/ANXA6 that have been associated with risk for psoriasis in 7,223 subjects. Multiple logistic regression analysis was used for data analysis. RESULTS: Significant interactions were found for alcohol intake with rs3762999 (p=0.0257) and rs999556 (p=0.0071) at TNIP/ANXA6; and for cigarette smoking with rs7007032 (p=0.0023) and rs10088247 (p=0.0023) at CSMD1. CONCLUSION: This study provides empirical evidence for the gene-environment interactions between TNIP1/ANXA6 and alcohol use, CSMD1 and cigarette smoking, highlighting the importance of gene-environment interactions in the pathogenesis of psoriasis.
