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Systemic lupus erythematosus (SLE) has heterogeneous clinical manifestations. IFIH1 (interferon induced with helicase C domain 1) as one of antiviral helicase genes mediating type I interferon production, plays an essential role in the pathogenesis of SLE. The gene variants in IFIH1 could abnormally activate antiviral defenses and increased type I interferon signaling. The present study aimed to validate associations between single nucleotide polymorphisms (SNP) in IFIH1 and the pathogenesis of SLE. In total, rs1990760, rs3747517 and rs10930046 in IFIH1 are genotyped in 400 SLE patients and 659 health controls in Chinese cohort by an improved multiplex ligation detection reaction (iMLDR) technique. Significant associations were observed between alleles of IFIH1 (rs1990760 C > T, P = 0.005, OR = 1.36, 95%CI = 1.10–1.69; rs3747517 T > C, P = 0.004, OR = 1.31, 95%CI = 1.09–1.58, respectively) and SLE susceptibility. IFIH1 rs1990760 TT genotype carriers had lower serum levels of IL-18 (P < 0.001) and granzyme B (P < 0.001) than CC and CT genotype carriers. IFIH1 rs1990760 CT genotype carriers had higher anti-dsDNA–positive than CC and TT genotype carriers. In conclusion, IFIH1 polymorphisms (rs1990760 and rs3747517) were associated with SLE susceptibility and rs1990760 risk T allele related with IL-18 and granzyme B serum levels in SLE patients.

Autoimmune disease associated IFIH1 single nucleotide polymorphism related with IL-18 serum levels in Chinese systemic lupus erythematosus patients