Rapidly Progressive Nephronophthisis in a 2-Year-Old Boy with a Homozygous SDCCAG8 Mutation.

Rapidly Progressive Nephronophthisis in a 2-Year-Old Boy with a Homozygous SDCCAG8 Mutation. Tohoku J Exp Med. 2019;249(1):29-32 Authors: Watanabe Y, Fujinaga S, Sakuraya K, Morisada N, Nozu K, Iijima K Abstract Nephronophthisis (NPHP) is an autosomal recessive cystic kidney disease that is characterized by primary ciliary dysfunction (ciliopathy) and progresses to end-stage kidney disease (ESKD) during the second decade of life (juvenile and adolescent NPHP) or before the age of 3 years (infantile NPHP). Here we describe the case of an infant with NPHP who carries a homozygous mutation in SDCCAG8 (also called NPHP10 or BBS16) that encodes SDCCAG8 (serologically defined colon cancer antigen 8). SDCCAG8 is localized at the centrioles of both renal epithelial cells and retinal photoreceptor cells. A mutation in SDCCAG8 is also associated with Bardet-Biedl syndrome (BBS), characterized by NPHP, obesity, polydactyly, and rod-cone dystrophy. A 2-year-old boy was referred to our hospital due to kidney dysfunction of unknown etiology; the patient presented with delayed development and opsoclonus but did not exhibit the clinical characteristics of BBS. Histological findings such as dilatation of tubules and irregular thickness of tubular basement membrane confirmed the diagnosis of NPHP. Four months after referral, the patient's renal function was rapidly deteriorated, and emergency peritoneal dialysis was initiated. Next-generation sequenci...
Source: The Tohoku Journal of Experimental Medicine - Category: Research Authors: Tags: Tohoku J Exp Med Source Type: research