Characteristics of healthy donors (CTR, control group) and patients with elevated TgAb and/or anti-TPO levels without symptoms of hypothyroidism (HT1), patients with Hashimoto’s thyroiditis (HT2) and patients with Graves’ disease before (GD) and after (GD/T) TSH normalization (study groups). This evidence concerns the gene TPO and Hashimoto thyroiditis.