The inborn errors of heme biosynthesis,the porphyrias, are 8 genetically distinctmetabolic disorders that can be classifiedas “acute hepatic,” “hepatic cutaneous,”and “erythropoietic cutaneous” diseases.Recent advances in understanding theirpathogenesis and molecular genetic heterogeneityhave led to improved diagnosisand treatment. These advances includeDNA-based diagnoses for all theporphyrias, new understanding of thepathogenesis of the acute hepatic porphyrias,identification of the iron overloadinducedinhibitor of hepatic uroporphyrin
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