Hematologic aspects of the porphyrias - PubMed (original) (raw)
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Review
Hematologic aspects of the porphyrias
S Sassa. Int J Hematol. 2000 Jan.
Abstract
The porphyrias are disorders that can be inherited and acquired, in which the activities of the enzymes of the heme biosynthetic pathway are partially or almost totally deficient. There are 8 enzymes involved in the synthesis of heme, and, with the exception of the first enzyme, an enzymatic defect at every step leads to tissue accumulation and excessive excretion of porphyrins and/or their precursors, such as delta-aminolevulinic acid and porphobilinogen. Whereas heme, the final product of the biosynthetic pathway, is biologically important, porphyrins and their precursors are not only useless but also toxic. Porphyrias can be classified as either photosensitive or neurologic, depending on the type of symptoms, but some porphyrias cause both photosensitive and neurologic symptoms. Alternatively, they can be classified either hepatic or erythropoietic, depending on the principal site of expression of the specific enzymatic defect. The tissue-specific expression of porphyrias is largely due to the tissue-specific control of heme pathway gene expression, particularly at the level of delta-aminolevulinate synthase, the first and the rate-limiting enzyme of heme biosynthesis. In this chapter, hematologic aspects of the erythropoietic porphyrias will be described. The 3 major erythropoietic porphyrias are congenital erythropoietic porphyria (CEP), hepatoerythropoietic porphyria (HEP) and erythropoietic protoporphyria (EPP).
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