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• W3034171275 abstract "Abstract Background and Aims Monogenic inherited diseases are an underestimated but important cause of chronic kidney disease (CKD). Despite the increasing knowledge about their inheritance, they are identified in fewer than 10% of CKD patients. Among monogenic causes of CKD, polycystic kidney diseases (PKD) represent a group of disorders with a clinical and genetic heterogeneity and a variable phenotype (from early manifestations during pregnancy or childhood to the absence of clinical manifestations until adulthood). We here present a PKD family with 5 members displaying the disease (Figure 1). Method We revised patients clinical history, laboratory data and imaging exams. An accurate family history was recovered. Blood samples were collected from living patients to perform an exome analysis using next generation sequencing to analyze all possible genes involved in PKD. Results Each patient presented a clinical history of nephrolithiasis, a variable degree of CKD (from normal kidney function to renal transplant), urinary and blood parameters compatible with distal renal tubular acidosis (hypercalciuria, low urinary citrate excretion and hypokalemia). Imaging exams showed several renal cysts in the medulla or at the cortico-medullary junction with intracystic calcifications (Figure 2). Some patients displayed also large cortical renal cysts and also hepatic and pancreatic cysts. The genetic analysis performed using next generation sequencing in four patients showed a new mutation on the gene DNAJB11; the mutation introduced a stop codon and was identified as pathogenic by prediction programs. It was present in heterozygosity in all subjects and had an autosomal dominant pattern of inheritance. Conclusion DNAJB11 mutations were reported as a cause of PKD for the first time in 2018 by Cornec-Le-Gall and colleagues. The nephropathy derived from these mutations need to be differentiated from ADPKD (autosomal dominant polycystic kidney disease), from ADTKD (autosomal dominant tubulointerstitial kidney disease) and from medullary sponge kidney. DNAJB11 encodes a co-chaperone of the endoplasmic reticulum (ER) also called ERdj3. It is part of the HSP40 protein family and plays a central role in both intracellular and extracellular proteomic homeostasis (proteostasis). In the intracellular compartment it acts as a co-chaperone in the pathway of the unfolded protein response (UPR) in which it binds misfolded proteins which have to be secreted and activates BiP an HSP70 of ER whose function is to correct the misfolding. In the kidney it is mainly expressed in the thick ascending limb of Henle’s loop, in the distal tubule and in the collecting duct justifying the clinical presentation of nephropathy and differentiating the disease from ADPKD (Figure 3)." @default.
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• W3034171275 date "2020-06-01" @default.
• W3034171275 modified "2023-09-23" @default.
• W3034171275 title "P0077A NEW MUTATION OF DNAJB11 AS A CAUSE OF CYSTIC KYDNEY DISEASE: THE FOURTH GENE OF ADPKD" @default.
• W3034171275 doi "https://doi.org/10.1093/ndt/gfaa142.p0077" @default.
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