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Background  Cytokines are known to be key players in dry eye syndrome (DES) and Sjogren’s syndrome (SS) pathogenesis. In this study we compared single nucleotide polymorphism (SNP) variations in genes encoding cytokine levels among SS and DES patients in Israel.    Methods  We recruited 180 subjects, 82 with SS and 98 with DES. Using a candidate gene approach and allele-specific PCR technique for genotyping, proportions of risk alleles in Tumor Necrosis Factor α (TNFα) (rs1800629), IinterLeukin-10 (IL-10) (rs1800896) and TNFAIP3 (rs2230926) SNPs were compared between study groups.    Results  Allelic distribution was found very similar to Caucasian (CEU – Utah residents with Northern and Western European roots) population distributions in these SNPs. While none of the SNPs’ variants were significantly associated with SS or DES in a recessive model, in an additive model the TNFα G risk allele was found higher among SS patients compared to DES (Homozygote-G: 84.2% vs. 70.8%; Heterozygote: 26.9% vs. 11.2%, respectively,  p  = 0.02). After adjustment for age, gender and ethnicity, these variants weren’t associated with SS. Genetic scoring reveals that SS patients are more likely to present variants of all three SNPs than DES subjects.    Conclusions  This is the first study evaluating these SNP variations among both patients with DES and patients with SS. We found the allelic distribution in each SNP to be very similar to that found in healthy Caucasian populations presented in the HapMap project. We found the TNFα allele significantly associated with DES for homozygotes, and associated with SS for heterozygotes in the additive model.

SNP variations in IL10, TNFα and TNFAIP3 genes in patients with dry eye syndrome and Sjogren’s syndrome