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- W2153344800 abstract "Congenital erythropoietic porphyria (CEP) is a rare autosomal recessive disease caused by the deficient activity of the heme biosynthetic enzyme, uroporphyrinogen III synthase (URO-synthase), and the accumulation of the nonphysiologic and phototoxic porphyrin I isomers. Clinical manifestations range from severe mutilation to mild erosions and blisters on sun-exposed areas. Evaluation of the URO-synthase mutation and residual enzyme activity has been correlated with the phenotypic expression of the disease.We describe 16- and 4-year-old brothers with CEP with a mild phenotype due to a novel genotype, one allele having a promoter mutation (-76G-->A) and the other having an exonic missense mutation (G225S). The father and a 4-year-old fraternal twin brother were carriers of the -76G-->A mutation, whereas the mother and a 15-year-old brother were carriers of the G225S mutation. Previous in vitro expression studies demonstrated that the G225S mutation severely decreased URO-synthase activity to 1.2% of normal, whereas the promoter mutation decreased the activity to approximately 50% of wild type, accounting for the mild clinical phenotype.The mild disease phenotype in these patients is a further example of the clinical heterogeneity seen in CEP and is additional proof that in vitro enzyme expression studies provide dependable genotype-phenotype correlations." @default.
- W2153344800 created "2016-06-24" @default.
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- W2153344800 date "2005-12-01" @default.
- W2153344800 modified "2023-10-18" @default.
- W2153344800 title "Two Brothers With Mild Congenital Erythropoietic Porphyria Due to a Novel Genotype" @default.
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- W2153344800 doi "https://doi.org/10.1001/archderm.141.12.1575" @default.
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