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We have elucidated the molecular pathology of three types of congenital hypothyroidism. Thyrotropin (TSH) is the major regulator of thyroid function. In cases of isolated congenital TSH deficiency, we found that they are caused by a missense mutation in the conserved CAGYC region of the  TSHβ  gene. Pit-1/GHF-1 is a pituitary specific POU-domain DNA binding factor, which transactivates the growth hormone (GH), prolactin (PRL),  TSHβ  genes, and the  PIT1  gene itself. In cases of combined deficiency of GH, PRL, and TSH, we found that they are caused by abnormalities in the  PIT1  gene, either recessively or dominantly. Sodium dependent iodide symporter (NIS) actively transports iodide into the thyroid cells to produce thyroid hormones. In cases of iodide transport defect, we elucidated that a missense mutation in the transmembrane region of the  NIS  gene caused them.

Genetic Basis of Congenital Hypothyroidism: Abnormalities in the TSHβ Gene, the PIT1 Gene, and the NIS Gene