Thyroid dyshormonogenesis (TDH) was reported to be linked with mutations in the thyroid oxidase 2 (DUOX2), dual-oxidase maturation factor 2 (DUOXA2), thyroglobulin (TG), thyroid peroxidase (TPO), solute carrier family 5 member 5 (SLC5A5), solute carrier family 26 member 4 (SLC26A4), and iodotyrosine deiodinase (IYD) genes [5, 6]. The gene discussed is IYD; the disease is familial thyroid dyshormonogenesis.