Abstract
Congenital erythropoietic porphyria (CEP) is an inherited metabolic disorder characterized by an overproduction and accumulation of porphyrins in bone marrow. This autosomal recessive disease results from a deficiency of uroporphyrinogen III synthase (UROIIIS), the fourth enzyme of the haem biosynthetic pathway. It is phenotypically heterogeneous: patients with mild disease have cutaneous involvement, while more severely affected patients are transfusion dependent. The cloning of UROIIIS cDNA and genomic DNA has allowed the molecular characterization of the genetic defect in a number of families. To date, 22 different mutations have been characterized. Allogeneic bone marrow transplantation is the only curative treatment available for the severe, transfusion-dependent, cases. When bone marrow transplantation cannot be performed owing to the absence of a suitable donor, the autografting of genetically modified cells is an appealing alternative. The best approach to somatic gene therapy in this disease involves the use of recombinant retroviral vectors to transduce cells ex vivo, followed by autologous transplantation of the genetically modified cells. We investigated retroviral transfer in deficient human fibroblasts, immortalized lymphoblasts as well as bone marrow cells, and obtained a complete restoration of the enzymatic activity and full metabolic correction.
Using K562 cells, an erythroleukaemic cell line, the expression of the transgene remained stable during 3 months and during erythroid differentiation of the cells. Finally, a 1.6- to 1.9-fold increase in enzyme activity compared to the endogenous level was found in normal CD34+ cells, a population of heterogeneous cells known to contain the progenitor/stem cells for long-term expression. The future availability of a mouse model of the disease will permit ex vivo gene therapy experiments on the entire animal.
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Mazurier, F., Moreau-Gaudry, F., Salesse, S. et al. Gene transfer of the uroporphyrinogen III synthase cDNA into haematopoietic progenitor cells in view of a future gene therapy in congenital erythropoietic porphyria. J Inherit Metab Dis 20, 247–257 (1997). https://doi.org/10.1023/A:1005365008147
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DOI: https://doi.org/10.1023/A:1005365008147