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Rare variants in BNC2 are implicated in autosomal-dominant congenital lower urinary-tract obstruction

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Item Type:Article
Title:Rare variants in BNC2 are implicated in autosomal-dominant congenital lower urinary-tract obstruction
Creators Name:Kolvenbach, C.M. and Dworschak, G.C. and Frese, S. and Japp, A.S. and Schuster, P. and Wenzlitschke, N. and Yilmaz, Ö. and Lopes, F.M. and Pryalukhin, A. and Schierbaum, L. and van der Zanden, L.F.M. and Kause, F. and Schneider, R. and Taranta-Janusz, K. and Szczepańska, M. and Pawlaczyk, K. and Newman, W.G. and Beaman, G.M. and Stuart, H.M. and Cervellione, R.M. and Feitz, W.F.J. and van Rooij, I.A.L.M. and Schreuder, M.F. and Steffens, M. and Weber, S. and Merz, W.M. and Feldkötter, M. and Hoppe, B. and Thiele, H. and Altmüller, J. and Berg, C. and Kristiansen, G. and Ludwig, M. and Reutter, H. and Woolf, A.S. and Hildebrandt, F. and Grote, P. and Zaniew, M. and Odermatt, B. and Hilger, A.C.
Abstract:Congenital lower urinary-tract obstruction (LUTO) is caused by anatomical blockage of the bladder outflow tract or by functional impairment of urinary voiding. About three out of 10,000 pregnancies are affected. Although several monogenic causes of functional obstruction have been defined, it is unknown whether congenital LUTO caused by anatomical blockage has a monogenic cause. Exome sequencing in a family with four affected individuals with anatomical blockage of the urethra identified a rare nonsense variant (c.2557C>T [p.Arg853(∗)]) in BNC2, encoding basonuclin 2, tracking with LUTO over three generations. Re-sequencing BNC2 in 697 individuals with LUTO revealed three further independent missense variants in three unrelated families. In human and mouse embryogenesis, basonuclin 2 was detected in lower urinary-tract rudiments. In zebrafish embryos, bnc2 was expressed in the pronephric duct and cloaca, analogs of the mammalian lower urinary tract. Experimental knockdown of Bnc2 in zebrafish caused pronephric-outlet obstruction and cloacal dilatation, phenocopying human congenital LUTO. Collectively, these results support the conclusion that variants in BNC2 are strongly implicated in LUTO etiology as a result of anatomical blockage.
Keywords:Lower Urinary Tract Obstruction, LUTO, Posterior Urethral Valve, Basonuclin 2, BNC2, Functional Genetics, Pronephric Development, Cloacae, Distal Pronephric Outlet Obstruction, Animals, Zebrafish
Source:American Journal of Human Genetics
Publisher:Cell Press
Page Range:994-1006
Date:2 May 2019
Official Publication:https://doi.org/10.1016/j.ajhg.2019.03.023
PubMed:View item in PubMed

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