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Lijun Zhang, Hongsong Yu, Minming Zheng, Hua Li, Yunjia Liu, Aize Kijlstra, Peizeng Yang; Association of ERAP1 Gene Polymorphisms With Behçet's Disease in Han Chinese. Invest. Ophthalmol. Vis. Sci. 2015;56(10):6029-6035. doi: https://doi.org/10.1167/iovs.15-17544.
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© ARVO (1962-2015); The Authors (2016-present)
Behçet's disease (BD) is a common uveitis entity in China. The endoplasmic reticulum aminopeptidase 1 (ERAP1), has a significant influence on the stability and immunological properties of MHC-I loaded peptides. In the present study, we investigated the association of ERAP1 gene polymorphisms with BD in a Chinese Han population.
A two-stage case-control study was carried out in 930 BD patients and 1704 healthy controls. Seven single nucleotide polymorphisms (SNPs) of the ERAP1 gene were determined using a PCR restriction fragment length polymorphism (PCR-RFLP) assay and one SNP was genotyped by TaqMan SNP genotyping assay. Furthermore, ERAP1 expression in peripheral blood mononuclear cells (PBMCs) was examined in genotyped individuals by real-time PCR.
The result demonstrated that the frequencies of the A allele of rs1065407 and C allele of rs10050860 were significantly decreased in BD patients (Pc = 8.5 × 10−8, OR = 0.51; Pc = 1.1 × 10−5, OR = 0.54, respectively). No significant association was observed for the other six SNPs. ERAP1 expression in AA carriers of rs1065407 and CC carriers of rs10050860 was higher than that observed in AC/CC carriers (P = 0.022) or CT/TT carriers (P = 0.018) by LPS-stimulated PBMCs, respectively. In addition, the expression of ERAP1 in active BD patients not receiving immunosuppression was significantly lower than that in healthy controls (P = 3.8 × 10−4).
Our study showed that rs1065407 and rs10050860 of the ERAP1 gene may contribute to the genetic susceptibility of BD by modulating the expression of ERAP1.
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