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PorphyriaDirect access to data Alias
Inherited porphyrias are a group of monogenic, mostly autosomal dominant disorders characterized by the markedly increased formation and excretion of porphyrins and their precursors (delta aminolevulinic acid or ALA, and porphobilinogen or PBG). Each type of porphyria is the result of a dysfunctioning enzyme involved in the biosynthesis of heme. Deficiencies are due to mutations in the corresponding genes, and alleles are often very heterogeneous. Disorders are classified as hepatic or erythropoietic, according to the location of predominant expression of the metabolic defect. Diagnosis of acute attacks is established by measuring urinary ALA and PBG, and treated with heme arginate. * Author: Prof. J.C.Deybach. (Sept. 1999) * Clinical signs
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