Single nucleotide polymorphisms (SNPs) within OCT1-binding sites that are associated with multiple autoimmune diseases, like celiac disease (CD), human systemic lupus erythematosus (SLE), rheumatoid arthritis (RA), type 1 diabetes (T1D), and primary biliary cirrhosis (PBC), have been reported by Maurano et al. [27]. Here, POU2F1 is linked to rheumatoid arthritis.