Thyroid Dyshormonogenesis 1, also known as tdh1, is related to pendred syndrome and thyroid dyshormonogenesis 3, and has symptoms including constipation and dry skin. An important gene associated with Thyroid Dyshormonogenesis 1 is SLC5A5 (Solute Carrier Family 5 Member 5), and among its related pathways/superpathways is Metabolism of amine-derived hormones. Affiliated tissues include thyroid and skin, and related phenotypes are intellectual disability and constipation