Aliases for DIO3 Gene
External Ids for DIO3 Gene
Previous HGNC Symbols for DIO3 Gene
Previous GeneCards Identifiers for DIO3 Gene
The protein encoded by this intronless gene belongs to the iodothyronine deiodinase family. It catalyzes the inactivation of thyroid hormone by inner ring deiodination of the prohormone thyroxine (T4) and the bioactive hormone 3,3',5-triiodothyronine (T3) to inactive metabolites, 3,3',5'-triiodothyronine (RT3) and 3,3'-diiodothyronine (T2), respectively. This enzyme is highly expressed in pregnant uterus, placenta, fetal and neonatal tissues, and thought to prevent premature exposure of developing fetal tissues to adult levels of thyroid hormones. It regulates circulating fetal thyroid hormone concentrations, and thus plays a critical role in mammalian development. Knockout mice lacking this gene exhibit abnormalities related to development and reproduction, and increased activity of this enzyme in infants with hemangiomas causes severe hypothyroidism. This protein is a selenoprotein, containing the rare selenocysteine (Sec) amino acid at its active site. Sec is encoded by the UGA codon, which normally signals translation termination. The 3' UTRs of selenoprotein mRNAs contain a conserved stem-loop structure, designated the Sec insertion sequence (SECIS) element, that is necessary for the recognition of UGA as a Sec codon rather than as a stop signal. [provided by RefSeq, May 2016]
GeneCards Summary for DIO3 Gene
DIO3 (Deiodinase, Iodothyronine, Type III) is a Protein Coding gene. Diseases associated with DIO3 include Hypothyroidism and Neonatal Thyrotoxicosis. Among its related pathways are thyronamine and iodothyronamine metabolism and Amine-derived hormones. GO annotations related to this gene include thyroxine 5-deiodinase activity and thyroxine 5-deiodinase activity. An important paralog of this gene is DIO2.
UniProtKB/Swiss-Prot for DIO3 Gene
Responsible for the deiodination of T4 (3,5,3,5-tetraiodothyronine) into RT3 (3,3,5-triiodothyronine) and of T3 (3,5,3-triiodothyronine) into T2 (3,3-diiodothyronine). RT3 and T2 are inactive metabolites. May play a role in preventing premature exposure of developing fetal tissues to adult levels of thyroid hormones. Can regulate circulating fetal thyroid hormone concentrations throughout gestation. Essential role for regulation of thyroid hormone inactivation during embryological development.