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  • Title: Infantile steroid-resistant nephrotic syndrome associated with double homozygous mutations of podocin.
    Author: Caridi G, Berdeli A, Dagnino M, Di Duca M, Mir S, Cura A, Ravazzolo R, Ghiggeri GM.
    Journal: Am J Kidney Dis; 2004 Apr; 43(4):727-32. PubMed ID: 15042551.
    Abstract:
    Mutations of NPHS2, ie, the gene coding for podocin, are associated with nephrotic syndrome (NS) in children, with a clinical phenotype characterized by variable age at onset (from 1 to 10 years) and steroid/cyclosporine resistance. The authors describe an infantile variant in 2 families (3 patients) from Turkey, characterized by homozygosity of a complex haplotype, in which 2 podocin mutations (P20L-R168H) are present in cis. It results from the insertion of a new mutation (R168H), only found in Turkey, on a more ancient haplotype containing the P20L mutation observed in the European population. All patients described had presented with NS within the first 6 months of life with strict resistance to drugs and a histologic background of focal segmental glomerulosclerosis. This is the first description of double homozygous mutations in an autosomal recessive renal disease reported in the literature. The association with infantile NS widens the panel of clinical presentation related to NPHS2 mutations.
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