Pediatric Nephrology

, Volume 24, Issue 10, pp 1967–1973

Locus heterogeneity of Dent’s disease: OCRL1 and TMEM27 genes in patients with no CLCN5 mutations

  • Enrica Tosetto
  • Maria Addis
  • Gianluca Caridi
  • Cristiana Meloni
  • Francesco Emma
  • Gianluca Vergine
  • Gilda Stringini
  • Teresa Papalia
  • Giancarlo Barbano
  • Gian Marco Ghiggeri
  • Laura Ruggeri
  • Nunzia Miglietti
  • Angela D′Angelo
  • Maria Antonietta Melis
  • Franca Anglani
Original Article

DOI: 10.1007/s00467-009-1228-4

Cite this article as:
Tosetto, E., Addis, M., Caridi, G. et al. Pediatr Nephrol (2009) 24: 1967. doi:10.1007/s00467-009-1228-4

Abstract

Dent′s disease is an X-linked renal tubulopathy caused by mutations mainly affecting the CLCN5 gene. Defects in the OCRL1 gene, which is usually mutated in patients with Lowe syndrome, have recently been shown to lead to a Dent-like phenotype, called Dent’s disease 2. About 25% of Dent’s disease patients do not carry CLCN5/OCRL1 mutations. The CLCN4 and SLC9A6 genes have been investigated, but no mutations have been identified. The recent discovery of a novel mediator of renal amino acid transport, collectrin (the TMEM27 gene), may provide new insight on the pathogenesis of Dent’s disease. We studied 31 patients showing a phenotype resembling Dent’s disease but lacking any CLCN5 mutations by direct sequencing of the OCRL1 and TMEM27 genes. Five novel mutations, L88X, P161HfsX167, F270S, D506N and E720D, in the OCRL1 gene, which have not previously been reported in patients with Dent’s or Lowe disease, were identified among 11 patients with the classical Dent’s disease phenotype. No TMEM27 gene mutations were discovered among 26 patients, 20 of whom had an incomplete Dent’s disease phenotype. Our findings confirm that OCRL1 is involved in the functional defects characteristic of Dent’s disease and suggest that patients carrying missense mutations in exons where many Lowe mutations are mapped may represent a phenotypic variant of Lowe syndrome.

Keywords

Dent’s disease 2Genotype-phenotype correlationLowe syndromeOCRL1 mutationsTMEM27 gene

Copyright information

© IPNA 2009

Authors and Affiliations

  • Enrica Tosetto
    • 1
  • Maria Addis
    • 2
  • Gianluca Caridi
    • 3
  • Cristiana Meloni
    • 2
  • Francesco Emma
    • 4
  • Gianluca Vergine
    • 4
  • Gilda Stringini
    • 4
  • Teresa Papalia
    • 5
  • Giancarlo Barbano
    • 3
  • Gian Marco Ghiggeri
    • 3
  • Laura Ruggeri
    • 6
  • Nunzia Miglietti
    • 6
  • Angela D′Angelo
    • 1
  • Maria Antonietta Melis
    • 2
  • Franca Anglani
    • 1
  1. 1.Division of Nephrology, Department of Medical and Surgical SciencesUniversity of PaduaPadovaItaly
  2. 2.Department of Biomedical Sciences and BiotechnologyUniversity of CagliariCagliariItaly
  3. 3.G. Gaslini Pediatric InstituteGenoaItaly
  4. 4.Division of Nephrology and DialysisBambin Gesù Pediatric HospitalRomeItaly
  5. 5.Department of Nephrology‘Annunziata’ HospitalCosenzaItaly
  6. 6.Department of PediatricsUniversity of BresciaBresciaItaly