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- W2070116787 abstract "Summary Summary:#Partial deficiency of enzymes in the haem synthetic pathway gives rise to a group of seven inherited metabolic disorders, the porphyrias. Each deficiency is associated with a characteristic increase in haem precursors that correlates with the symptoms associated with individual porphyrias and allows accurate diagnosis. Two types of clinical presentation occur separately or in combination; acute life‐threatening neurovisceral attacks and/or cutaneous symptoms. Five of the porphyrias are low‐penetrance autosomal dominant conditions in which clinical expression results from additional factors that act by increasing demand for haem or by causing an additional decrease in enzyme activity or by a combination of these effects. These include both genetic and environmental factors. In familial porphyria cutanea tarda (PCTF), environmental factors that include alcohol, exogenous oestrogens and hepatotropic viruses result in inhibition of hepatic enzyme activity via a mechanism that involves excess iron accumulation. In erythropoietic protoporphyria (EPP), co‐inheritance of a functional polymorphism in trans to a null ferrochelatase allele accounts for most clinically overt cases. In the autosomal dominant acute hepatic porphyrias (acute intermittent porphyria, variegate porphyria, hereditary coproporphyria), acute neurovisceral attacks occur in a minority of those who inherit one of these disorders. Although various exogenous (e.g. drugs, alcohol) and endogenous factors (e.g. hormones) have been identified as provoking acute attacks, these do not provide a full explanation for the low penetrance of these disorders. It seems probable that genetic background influences susceptibility to acute attacks, but the genes that are involved have not yet been identified." @default.
- W2070116787 created "2016-06-24" @default.
- W2070116787 creator A5061867731 @default.
- W2070116787 creator A5066619588 @default.
- W2070116787 date "2005-05-01" @default.
- W2070116787 modified "2023-10-10" @default.
- W2070116787 title "Molecular mechanisms of dominant expression in porphyria" @default.
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- W2070116787 doi "https://doi.org/10.1007/s10545-005-8050-3" @default.
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