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Diverse Phenotypic Expression of NPHP4 Mutations in Four Siblings #MMPMID25818963
Bakkalo?lu SA; Kandur Y; Demirda? TB; Gönül ?I; Hildebrandt F
Turk J Pediatr 2014[Jul]; 56 (4): 423-6 PMID25818963show ga
Nephronophthisis (NPHP) is an autosomal recessive disease characterized by renal tubular basement membrane disruption, interstitial fibrosis, and tubular cysts that progresses to end-stage kidney disease (ESKD). There are characteristic extrarenal manifestations. Mutations of more than thirteen genes have been identified that can cause NPHP. We herein report four siblings from a consanguineous family, who carried the same NPHP4 mutations but presented with different disease phenotypes ranging from enuresis nocturna to ESKD. Diluted urine and echogenic kidneys in ultrasound examination were consistent, which is typical for 100 % of the NPHP cases that have been described. Chronic kidney disease developed in the older two brothers. The observed phenotypic differences are likely to be related to environmental and epigenetic factors, oligogenic inheritance and modifier genes affecting their ages at presentation. NPHP should be considered as an important cause of ESKD in children, which insidiously progresses to ESKD and no specific therapy is available.