Thyroglobulin (TG) is a monomeric glycoprotein produced in thyroid gland with a molecular weight 660,000. It is secreted from the endoplasmatic reticulum site. It plays a major role in the synthesis of thyroid hormone (T4, T3) and iodothyronine. It has reported th at monomeric structure contains the thyroid hormones synthesis zone at both ends and glycosylation sites are scattered along the polypeptide chain of the protein. Mutations in the TG gene lead to the congenital hypothyroidism (CH).
