Supplementary Material for: An Analysis of the Association between Epilepsy-Related Genes and Vertigo in the Polish Population

Considering the possibility of a common genetic background of vertigo and epilepsy, we genotyped an affected group of individuals with vertigo and an unaffected group, by studying 26 single-nucleotide polymorphisms (SNPs) in 14 genes which were previously reported to be of particular importance for epilepsy. Significant differences were found between the patients and the control group (χ<sup>2</sup> = 38.3, df = 3, <i>p</i> = 1.6 × 10<sup>–7</sup>) for the frequencies of haplotypes consist ing of 2 SNPs located in chromosome 11 (rs1939012 and rs1783901 within genes <i>MMP8</i> and <i>SCN3B</i>, respectively). The haplotype rs1939012:C-rs1783901:A, consisting of the minor-frequency alleles was found to be associated with a higher risk of vertigo (OR = 5.0143, 95% CI = 1.6991–14.7980, <i>p</i> = 0.0035). In contrast, the haplotype rs1939012:T-rs1783901:A showed a significant association with a decreased risk of the disease (OR = 0.0597, 95% CI = 0.0136–0.2620, <i>p</i> = 0.0002). Our results suggest that the SNPs rs1939012 and rs1783901 may play a potential role of gene regulation and/or epistasis in a complex etiology of vertigo.