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Mutations in the uromodulin gene decrease urinary excretion of Tamm-Horsfall protein.

Anthony J Bleyer1, Thomas C Hart, Zak Shihabi

  • 1Section on Nephrology, Wake Forest University School of Medicine Medical Center, Winston-Salem, North Carolina 27157, USA. ableyer@wfubmc.edu

Kidney International
|August 26, 2004
PubMed
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Mutations in the uromodulin (UMOD) gene significantly reduce Tamm-Horsfall protein (THP) excretion in patients with UMOD-associated kidney disease. This profound reduction in THP levels may contribute to the development of progressive renal failure.

Area of Science:

  • Nephrology
  • Genetics
  • Biochemistry

Background:

  • Mutations in the uromodulin (UMOD) gene, encoding Tamm-Horsfall protein (THP), are linked to autosomal-dominant chronic renal failure.
  • Investigating the impact of UMOD gene mutations on THP protein expression is crucial for understanding kidney disease pathogenesis.

Purpose of the Study:

  • To quantitatively measure THP excretion in individuals with UMOD gene mutations.
  • To determine the relationship between UMOD gene mutations and THP levels in urine.

Main Methods:

  • Enzyme-linked immunosorbent assay (ELISA) was used to quantify THP excretion in urine samples.
  • Urine collections were obtained from individuals with a 27 bp deletion in UMOD, other UMOD mutations, and control subjects.

Related Experiment Videos

Main Results:

  • Individuals with UMOD mutations exhibited significantly reduced THP excretion compared to unaffected relatives and spouses.
  • A 27 bp deletion in UMOD resulted in markedly low THP excretion (5.8 +/- 6.3 mg THP/g creatinine).
  • Other UMOD mutations also led to extremely low THP excretion, irrespective of clinical factors like GFR or age.

Conclusions:

  • Autosomal-dominant UMOD gene mutations cause a profound reduction in THP excretion, a hallmark of UMOD-associated kidney disease.
  • Suppressed THP excretion likely reflects detrimental effects of mutated THP within the kidney.
  • These effects may play a significant role in the progressive renal failure observed in patients with UMOD gene mutations.