DNAJB11 Mutation in ADPKD Patients: Clinical Characteristics in a Monocentric Cohort

Author:

Aiello Valeria12,Ciurli Francesca1,Conti Amalia3ORCID,Cristalli Carlotta Pia3ORCID,Lerario Sarah2ORCID,Montanari Francesca3,Sciascia Nicola4,Vischini Gisella1ORCID,Fabbrizio Benedetta5,Di Costanzo Roberta12,Olivucci Giulia23,Pietra Andrea23ORCID,Lopez Antonia6ORCID,Zambianchi Loretta7,La Manna Gaetano12ORCID,Capelli Irene12

Affiliation:

1. Nephrology, Dialysis and Kidney Transplant Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, 40138 Bologna, Italy

2. Department of Medical and Surgical Sciences (DIMEC), Alma Mater Studiorum University of Bologna, 40138 Bologna, Italy

3. Medical Genetics Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, 40138 Bologna, Italy

4. Pediatric and Adult CardioThoracic and Vascular, Oncohematologic and Emergency Radiology Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, 40138 Bologna, Italy

5. Pathology Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, 40138 Bologna, Italy

6. Nephrology, Dialysis, Hypertension Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, 40138 Bologna, Italy

7. Nephrology and Dialysis, Ospedale Nuovo Morgagni-Forlì, 47120 Forlì, Italy

Abstract

Autosomal Dominant Polycystic Kidney Disease (ADPKD) is a late-onset cilia-related disorder, characterized by progressive cystic enlargement of the kidneys. It is genetically heterogeneous with PKD1 and PKD2 pathogenic variants identified in approximately 78% and 15% of families, respectively. More recently, additional ADPKD genes, such as DNAJB11, have been identified and included in the diagnostic routine test for renal cystic diseases. However, despite recent progress in ADPKD molecular approach, approximately ~7% of ADPKD-affected families remain genetically unresolved. We collected a cohort of 4 families from our center, harboring heterozygous variants in the DNAJB11 gene along with clinical and imaging findings consistent with previously reported features in DNAJB11 mutated patients. Mutations were identified as likely pathogenetic (LP) in three families and as variants of uncertain significance (VUS) in the remaining one. One patient underwent to kidney biopsy and showed a prevalence of interstitial fibrosis that could be observed in ~60% of the sample. The presence in the four families from our cohort of ADPKD characteristics together with ADTKD features, such as hyperuricemia, diabetes, and chronic interstitial fibrosis, supports the definition of DNAJB11 phenotype as an overlap disease between these two entities, as originally suggested by the literature.

Publisher

MDPI AG

Subject

Genetics (clinical),Genetics

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