Functional consequences of a novel uromodulin mutation in a family with familial juvenile hyperuricaemic nephropathy

Sigrid Tinschert, Nico Ruf, Ilenia Bernascone, Kai Sacherer, Giuseppe Lamorte, Hans Hellmut Neumayer, Peter Nürnberg, Friedrich C. Luft, Luca Rampoldi

Research output: Contribution to journalArticle

Abstract

Background. Familial juvenile hyperuricaemic nephropathy (FJHN) is an autosomal-dominant disorder featuring hyperuricaemia, low fractional urate excretion, interstitial nephritis and chronic renal failure. The responsible gene UMOD was recently identified. UMOD encodes for uromodulin or Tamm-Horsfall glycoprotein, the most abundant protein in normal urine. We encountered a family with FJHN and identified a novel UMOD mutation in exon 6. Methods. We sequenced the gene in all family members, identified the mutation, and verified its presence in the affected members. We next performed functional studies of the mutant protein by immunofluorescence and FACS analysis on transfected cells. Results. The mutation p.C347G (c.1039T > G) results in a conserved cysteine to glycine amino acid substitution in the uromodulin zona pellucida (ZP) domain. The cell studies showed that the novel uromodulin mutation causes a delay in protein export to the plasma membrane due to its retention in the endoplasmic reticulum. Conclusions. We describe the first reported mutation mapping in the ZP uromodulin domain. Our data provide further evidence showing why the excretion of uromodulin is reduced in this syndrome.

Original languageEnglish
Pages (from-to)3150-3154
Number of pages5
JournalNephrology Dialysis Transplantation
Volume19
Issue number12
DOIs
Publication statusPublished - Dec 2004

Keywords

  • Familial juvenile hyperuricaemic nephropathy
  • Genetics
  • Interstitial nephritis
  • Tamm-Horsfall glycoprotein
  • Uric acid
  • Uromodulin

ASJC Scopus subject areas

  • Nephrology
  • Transplantation

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    Tinschert, S., Ruf, N., Bernascone, I., Sacherer, K., Lamorte, G., Neumayer, H. H., Nürnberg, P., Luft, F. C., & Rampoldi, L. (2004). Functional consequences of a novel uromodulin mutation in a family with familial juvenile hyperuricaemic nephropathy. Nephrology Dialysis Transplantation, 19(12), 3150-3154. https://doi.org/10.1093/ndt/gfh524