NPHP1 (Nephrocystin-1) gene deletions cause adult-onset ESRD

Rozemarijn Snoek, Jessica Van Setten, Brendan J. Keating, Ajay K. Israni, Pamala A. Jacobson, William S. Oetting, Arthur J. Matas, Roslyn B. Mannon, Zhongyang Zhang, Weijia Zhang, Ke Hao, Barbara Murphy, Roman Reindl-Schwaighofer, Andreas Heinzl, Rainer Oberbauer, Ondrej Viklicky, Peter J. Conlon, Caragh P. Stapleton, Stephan J.L. Bakker, Harold SniederEdith D.J. Peters, Bert Van Der Zwaag, Nine V.A.M. Knoers, Martin H. De Borst, Albertien M. Van Eerde

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21 Scopus citations

Abstract

Background Nephronophthisis (NPH) is the most prevalent genetic cause for ESRD in children. However, little is known about the prevalence of NPH in adult-onset ESRD. Homozygous full gene deletions of the NPHP1 gene encoding nephrocystin-1 are a prominent cause of NPH. We determined the prevalence of NPH in adults by assessing homozygous NPHP1 full gene deletions in adult-onset ESRD. Methods Adult renal transplant recipients from five cohorts of the International Genetics and Translational Research in Transplantation Network (iGeneTRAiN) underwent single-nucleotide polymorphism genotyping. After quality control, we determined autosomal copy number variants (such as deletions) on the basis of median log2 ratios and B-allele frequency patterns. The findings were independently validated in one cohort. Patients were included in the analysis if they had adult-onset ESRD, defined as start of RRT at $18 years old. Results We included 5606 patients with adult-onset ESRD; 26 (0.5%) showed homozygous NPHP1 deletions. No donor controls showed homozygosity for this deletion. Median age at ESRD onset was 30 (range, 18–61) years old for patients with NPH, with 54% of patients age $30 years old. Notably, only three (12%) patients were phenotypically classified as having NPH, whereas most patients were defined as having CKD with unknown etiology (n=11; 42%). Conclusions Considering that other mutation types in NPHP1 or mutations in other NPH-causing genes were not analyzed, NPH is a relatively frequent monogenic cause of adult-onset ESRD. Because 88% of patients had not been clinically diagnosed with NPH, wider application of genetic testing in adult-onset ESRD may be warranted.

Original languageEnglish (US)
Pages (from-to)1772-1779
Number of pages8
JournalJournal of the American Society of Nephrology
Volume29
Issue number6
DOIs
StatePublished - Jun 2018

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    Snoek, R., Van Setten, J., Keating, B. J., Israni, A. K., Jacobson, P. A., Oetting, W. S., Matas, A. J., Mannon, R. B., Zhang, Z., Zhang, W., Hao, K., Murphy, B., Reindl-Schwaighofer, R., Heinzl, A., Oberbauer, R., Viklicky, O., Conlon, P. J., Stapleton, C. P., Bakker, S. J. L., ... Van Eerde, A. M. (2018). NPHP1 (Nephrocystin-1) gene deletions cause adult-onset ESRD. Journal of the American Society of Nephrology, 29(6), 1772-1779. https://doi.org/10.1681/ASN.2017111200