More dissimilarities than affinities between DNAJB11-PKD and ADPKD.

Clin Kidney J

Unità Operativa Nefrologia, Azienda-Ospedaliero Universitaria di Parma & Dipartimento di Medicina e Chirurgia, Università di Parma, Parma, Italy.

Published: June 2022

AI Article Synopsis

  • Polycystic kidney diseases (PKD) are significant contributors to chronic kidney disease, with autosomal dominant PKD (ADPKD) being the most prevalent form, while a new atypical form caused by DNAJB11 mutations has been identified.
  • A study compared 27 patients with DNAJB11-PKD to 42 typical ADPKD patients, revealing that DNAJB11-PKD patients had smaller kidneys and cysts, and progressed more slowly to end-stage kidney disease.
  • The findings indicated that DNAJB11-PKD presents unique clinical features, such as older age and higher rates of type 2 diabetes and kidney stones, suggesting that it should be classified separately from

Article Abstract

Background: Polycystic kidney diseases (PKD) are an important cause of chronic kidney disease (CKD). Autosomal dominant polycystic kidney disease (ADPKD) due to or mutations is the most common form, but other genes can be responsible for ADPKD and its phenocopies. Among them, a form of atypical ADPKD caused by mutations (DNAJB11-PKD) has been recently described.

Methods: We retrospectively recruited a cohort of 27 patients from six different families sharing common ancestries and harboring the same mutation (c.100C>T, p.Arg34*) and we compared it with a cohort of 42 typical ADPKD patients.

Results: DNAJB11-PKD patients show small/normal-sized kidneys, with significantly smaller cysts and a slower progression to end-stage kidney disease (ESKD) than ADPKD patients. In the DNAJB11-PKD cohort, the cystic phenotype could not be detected by ultrasound in about half of the patients, but all cases with available computed tomography/magnetic resonance scans displayed cysts. Clinically, DNAJB11-PKD patients displayed proteinuria (mostly albuminuria). Compared with ADPKD, DNAJB11-PKD patients were older and had a higher prevalence of type 2 diabetes mellitus (19% versus 0%;  = 0.007) and nephrolithiasis (62% versus 29%;  = 0.01), whereas the prevalence of cardiac valvular defects was lower (4% versus 51%; < 0.001).

Conclusions: Overall, clinical features of DNAJB11-PKD were more subtle compared with those of ADPKD. DNAJB11-PKD shows a unique renal and extrarenal phenotype, clinical presentation and natural history. Therefore our data support that this genetic disease is classified separately from ADPKD.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9155219PMC
http://dx.doi.org/10.1093/ckj/sfac032DOI Listing

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