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Journal Article
Research Support, Non-U.S. Gov't
Mutations in WT1 in boys with sporadic isolated steroid-resistant nephrotic syndrome.
Genetics and Molecular Research : GMR 2016 March 12
Mutations in the Wilms' tumor gene, WT1, can lead to syndromic steroid-resistant nephrotic syndrome and isolated steroid-resistant nephrotic syndrome. WT1 mutations have been identified in the majority of children with Denys-Drash or Frasier syndrome. WT1 mutations have not previously been identified in boys with sporadic isolated steroid-resistant nephrotic syndrome, but, recently, four boys with isolated nephrotic syndrome were identified to have WT1 mutations. However, whether boys with sporadic isolated steroid-resistant nephrotic syndrome should be routinely subjected to mutation analysis of WT1 has not been established. We examined 35 boys with sporadic isolated steroid-resistant nephrotic syndrome for mutations in WT1. Mutation analysis of all 10 exons of WT1 was performed by polymerase chain reaction and direct sequencing. Karyotype analysis or Y chromosome identification was performed for all patients. A Y chromosome or a 46, XY karyotype was demonstrated for all 35 patients. No causative WT1 mutation was identified in any of the patients. The WT1 mutation, IVS4+14T>C, which is not predicted to affect splicing, was identified in one patient who achieved complete remission after 8 weeks of oral prednisone treatment, indicating that IVS4+14T>C is not a causative mutation. Five WT1 polymorphisms were also identified in some patients and controls. Our results suggest that mutation analysis of WT1 should not be routinely performed for genetically defined boys with sporadic isolated steroid-resistant nephrotic syndrome.
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