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Induced pluripotent stem cell-based disease modeling identifies ligand-induced decay of megalin as a cause of Donnai-Barrow syndrome

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Item Type:Article
Title:Induced pluripotent stem cell-based disease modeling identifies ligand-induced decay of megalin as a cause of Donnai-Barrow syndrome
Creators Name:Flemming, J. and Marczenke, M. and Rudolph, I.M. and Nielsen, R. and Storm, T. and Erik, I.C. and Diecke, S. and Emma, F. and Willnow, T.E.
Abstract:Donnai-Barrow syndrome (DBS) is an autosomal-recessive disorder characterized by multiple pathologies including malformation of forebrain and eyes, as well as resorption defects of the kidney proximal tubule. The underlying cause of DBS are mutations in LRP2, encoding the multifunctional endocytic receptor megalin. Here, we identified a unique missense mutation R3192Q of LRP2 in an affected family that may provide novel insights into the molecular causes of receptor dysfunction in the kidney proximal tubule and other tissues affected in DBS. Using patient-derived induced pluripotent stem cell lines we generated neuroepithelial and kidney cell types as models of the disease. Using these cell models, we documented the inability of megalinR3192Q to properly discharge ligand and ligand-induced receptor decay in lysosomes. Thus, mutant receptors are aberrantly targeted to lysosomes for catabolism, essentially depleting megalin in the presence of ligand in this affected family.
Keywords:Endocytosis, Low-Molecular-Weight Proteinuria, Proximal Tubule Dysfunction, Renal Fanconi Syndrome
Source:Kidney International
ISSN:0085-2538
Publisher:Nature Publishing Group
Volume:98
Number:1
Page Range:159-167
Date:July 2020
Official Publication:https://doi.org/10.1016/j.kint.2020.02.021
PubMed:View item in PubMed

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