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Beyond the tubule: pathological variants of LRP2, encoding the megalin receptor, result in glomerular loss and early progressive chronic kidney disease

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  • Jennifer R Charlton
  • Weizhen Tan
  • Ghaleb Daouk
  • Lisa Teot
  • Seymour Rosen
  • Kevin M Bennett
  • Aleksandra Cwiek
  • Sejin Nam
  • Francesco Emma
  • François Jouret
  • João Paulo Oliveira
  • Lisbeth Tranebjærg
  • Carina Frykholm
  • Shrikant Mane
  • Friedhelm Hildebrandt
  • Tarak Srivastava
  • Tina Storm
  • Erik Ilsø Christensen
  • Rikke Nielsen
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Pathogenic variants in the LRP2 gene, encoding the multiligand receptor megalin, cause a rare autosomal recessive syndrome: Donnai-Barrow/Facio-Oculo-Acoustico-Renal (DB/FOAR) syndrome. Because of the rarity of the syndrome, the long-term consequences of the tubulopathy on human renal health have been difficult to ascertain, and the human clinical condition has hitherto been characterized as a benign tubular condition with asymptomatic low-molecular-weight proteinuria. We investigated renal function and morphology in a murine model of DB/FOAR syndrome and in patients with DB/FOAR. We analyzed glomerular filtration rate in mice by FITC-inulin clearance and clinically characterized six families, including nine patients with DB/FOAR and nine family members. Urine samples from patients were analyzed by Western blot analysis and biopsy materials were analyzed by histology. In the mouse model, we used histological methods to assess nephrogenesis and postnatal renal structure and contrast-enhanced magnetic resonance imaging to assess glomerular number. In megalin-deficient mice, we found a lower glomerular filtration rate and an increase in the abundance of injury markers, such as kidney injury molecule-1 and N-acetyl-β-d-glucosaminidase. Renal injury was validated in patients, who presented with increased urinary kidney injury molecule-1, classical markers of chronic kidney disease, and glomerular proteinuria early in life. Megalin-deficient mice had normal nephrogenesis, but they had 19% fewer nephrons in early adulthood and an increased fraction of nephrons with disconnected glomerulotubular junction. In conclusion, megalin dysfunction, as present in DB/FOAR syndrome, confers an increased risk of progression into chronic kidney disease.

Original languageEnglish
JournalAmerican Journal of Physiology - Renal Physiology
Volume319
Issue number6
Pages (from-to)F988-F999
ISSN1931-857X
DOIs
Publication statusPublished - 1 Dec 2020

    Research areas

  • Adolescent, Adult, Animals, Child, Child, Preschool, Female, Genetic Predisposition to Disease, Genetic Variation, Humans, Kidney Glomerulus/pathology, Low Density Lipoprotein Receptor-Related Protein-2/genetics, Male, Mice, Mice, Knockout, Middle Aged, Renal Insufficiency, Chronic/genetics, Young Adult

ID: 61716074