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Urocanic aciduria, also called urocanate hydratase deficiency or urocanase deficiency, is an autosomal recessive metabolic disorder caused by a deficiency of the enzyme urocanase. It is a secondary disorder of histidine metabolism.〔''Disorders of histidine metabolism.'' http://www.ommbid.com/OMMBID/the_online_metabolic_and_molecular_bases_of_inherited_disease/b/abstract/part8/ch80〕 ==Pathophysiology== The amino acid histidine, when catalyzed by the enzyme histidase, forms urocanic acid. Disruptions in this pathway, caused by a deficiency of histidase, is the underlying cause of histidinemia. This results in reduced levels of skin and serum urocanic acid, the primary indicator of insufficient histidase activity. In urocanic aciduria, increased urocanic acid in the urine indicates a deficiency of the enzyme urocanase. This enzyme breaks down urocanic acid, forming formininoglutamic acid, and also forms imidazolonepropionic acid from trans-urocanic acid. With normal to only slightly elevated levels of histidine present in the liver during urocanic aciduria, the only true metabolic indicator of the disorder can be found in the urine.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「urocanic aciduria」の詳細全文を読む スポンサード リンク
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