Nephrotic syndrome, type 20

Nephrotic syndrome type 20 (NPHS20) is an X-linked renal disorder characterized by onset of steroid-resistant nephrotic syndrome and proteinuria in the first decade of life in affected males. The course of the disorder is highly variable: some patients progress to end-stage kidney disease and may die in childhood without renal transplantation, whereas others have milder symptoms and maintain normal renal function. Carrier females may have a milder disorder with proteinuria or may be unaffected. Renal biopsy typically shows focal segmental glomerulosclerosis (FSGS) and effacement of podocyte foot processes (summary by Dorval et al., 2019 and Kampf et al., 2019). For a general phenotypic description and a discussion of genetic heterogeneity of nephrotic syndrome, see NPHS1 (256300). [from OMIM]