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Heterogeneity of mutations in the uroporphyrinogen III synthase gene in congenital erythropoietic porphyria

✍ Scribed by Samia Boulechfar; Vasco Silva; Jean-Charles Deybach; Yves Nordmann; Bernard Grandchamp; Hubert Verneuil

Publisher: Springer
Year: 1992
Tongue: English
Weight: 578 KB
Volume: 88
Category: Article
ISSN: 0340-6717
DOI: 10.1007/bf00197267

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✦ Synopsis

Congenital erythropoietic porphyria (CEP)

or Gt~nther's disease is an inborn error of heme biosynthesis transmitted as an autosomal recessive trait and characterized by a profound deficiency of uroporphyrinogen III synthase (UROIIIS) activity. We have previously described two missense mutations in the UROIIIS gene, confirming that the primary defect responsible for CEP is a structural alteration of this gene. We have extended our work to 5 additional unrelated families. Two new point mutations, a deletion and an insertion have been found in the messenger RNA. Our study shows that a molecular heterogeneity of the mutations exists in Giinther's disease. One mutation (C73R), however, appears to be more frequent than the others. Finally, the different normal and mutated proteins have been expressed in Escherichia coli to determine the consequence of the mutations on the enzyme activity.

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