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From lowe syndrome to Dent disease: correlations between mutations of the OCRL1 gene and clinical and biochemical phenotypes
Author(s) -
Hichri Haifa,
Rendu John,
Monnier Nicole,
Coutton Charles,
Dorseuil Olivier,
Poussou Rosa Vargas,
Baujat Geneviève,
Blanchard Anne,
Nobili François,
Ranchin Bruno,
Remesy Michel,
Salomon Rémi,
Satre Véronique,
Lunardi Joel
Publication year - 2011
Publication title -
human mutation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.981
H-Index - 162
eISSN - 1098-1004
pISSN - 1059-7794
DOI - 10.1002/humu.21391
Subject(s) - missense mutation , biology , exon , frameshift mutation , nonsense mutation , genetics , mutation , gene , rna splicing , phenotype , nonsense mediated decay , disease , microbiology and biotechnology , pathology , medicine , rna
Mutations of OCRL1 are associated with both the Lowe oculocerebrorenal syndrome, a multisystemic and Dent‐2 disease, a renal tubulopathy. We have identified a mutation in 130 Lowe syndrome families and 6 affected by Dent‐2 disease with 51 of these mutations being novel. No founding effect was evidenced for recurrent mutations. Two mutations initially reported as causing Dent‐2 disease were identified in patients, including two brothers, presenting with Lowe syndrome thus extending the clinical variability of OCRL1 mutations. mRNA levels, protein content, and PiP 2 ‐ase activities were analyzed in patient's fibroblasts. Although mRNA levels were normal in cells harboring a missense mutation, the OCRL1 content was markedly lowered, suggesting that enzymatic deficiency resulted mainly from protein degradation rather than from a catalytic inactivation. Analysis of a splicing mutation that led to the elimination of the initiation codon evidenced the presence of shortened forms of OCRL1 that might result from the use of alternative initiation codons. The specific mapping of the frameshift and nonsense mutations, exclusively identified in exons 1–7 and exons 8–23, respectively, for Dent disease and Lowe syndrome together with the possible use of alternative initiation codons might be related to their clinical expression, that is, Lowe syndrome or Dent‐2 disease. Hum Mutat 32:1–10, 2011. © 2011 Wiley‐Liss, Inc.