Clinical spectrum, prognosis and estimated prevalence of DNAJB11-kidney disease

Huynh, Vinh T., Audrézet, Marie-Pierre, Sayer, John A., Ong, Albert C., Lefevre, Siriane, Le Brun, Valoris, Després, Aurore, Senum, Sarah R., Chebib, Fouad T., Barroso-Gil, Miguel, Patel, Chirag, Mallett, Andrew, Goel, Himanshu, Mallawaarachchi, Amali C., Van Eerde, Albertien M., Ponlot, Eléonore, Kribs, Marc, Le Meur, Yannick, Harris, Peter C., and Cornec-Le Gall, Emilie (2020) Clinical spectrum, prognosis and estimated prevalence of DNAJB11-kidney disease. Kidney International, 98 (2). pp. 476-487.

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Monoallelic mutations of DNAJB11 were recently described in seven pedigrees with atypical clinical presentations of autosomal dominant polycystic kidney disease. DNAJB11 encodes one of the main cofactors of the endoplasmic reticulum chaperon BiP, a heat-shock protein required for efficient protein folding and trafficking. Here we conducted an international collaborative study to better characterize the DNAJB11-associated phenotype. Thirteen different loss-of-function variants were identified in 20 new pedigrees (54 affected individuals) by targeted next-generation sequencing, whole-exome sequencing or whole-genome sequencing. Amongst the 77 patients (27 pedigrees) now in total reported, 32 reached end stage kidney disease (range, 55-89 years, median age 75); without a significant difference between males and females. While a majority of patients presented with non-enlarged polycystic kidneys, renal cysts were inconsistently identified in patients under age 45. Vascular phenotypes, including intracranial aneurysms, dilatation of the thoracic aorta and dissection of a carotid artery were present in four pedigrees. We accessed Genomics England 100,000 genomes project data, and identified pathogenic variants of DNAJB11 in nine of 3934 probands with various kidney and urinary tract disorders. The clinical diagnosis was cystic kidney disease for eight probands and nephrocalcinosis for one proband. No additional pathogenic variants likely explaining the kidney disease were identified. Using the publicly available GnomAD database, DNAJB11 genetic prevalence was calculated at 0.85/10.000 individuals. Thus, establishing a precise diagnosis in atypical cystic or interstitial kidney disease is crucial, with important implications in terms of follow-up, genetic counseling, prognostic evaluation, therapeutic management, and for selection of living kidney donors.

Item ID: 67859
Item Type: Article (Research - C1)
ISSN: 1523-1755
Copyright Information: © 2020 International Society of Nephrology. Published by Elsevier Inc. All rights reserved.
Date Deposited: 05 Jul 2022 23:29
FoR Codes: 32 BIOMEDICAL AND CLINICAL SCIENCES > 3202 Clinical sciences > 320214 Nephrology and urology @ 50%
32 BIOMEDICAL AND CLINICAL SCIENCES > 3202 Clinical sciences > 320213 Medical genetics (excl. cancer genetics) @ 50%
SEO Codes: 20 HEALTH > 2001 Clinical health > 200105 Treatment of human diseases and conditions @ 100%
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