Tanigawa K, Bensidhoum M, Takamura N, Namba H, Yamashita S, de Verneuil H, Ged C. A novel point mutation in congenital erythropoietic porphyria in two members of Japanese family.
Hum Genet 1996;
97:557-60. [PMID:
8655129 DOI:
10.1007/bf02281859]
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Abstract
The molecular basis of the uroporphyrinogen III synthase (UROIIIS) deficiency was investigated in two members of a Japanese family. This defect in heme biosynthesis is responsible for a rare autosomal recessive disease: congenital erythropoietic porphyria (CEP) or Gnther's disease. The first patient was homoallelic for a novel missense mutation: a T to C transition of nucleotide 634 that predicted a serine to proline substitution at residue 212 (S212P). The second patient appeared heteroallelic, carrying the same missense mutation and a nonsense mutation: a C to T change at nucleotide 745, resulting in a premature stop at codon 249, instead of a glutamine (Q249X). The corresponding mutated proteins were expressed in Escherichia coli and no residual activity was observed. A family study was also performed to determine the carrier status.
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