Mutational Spectrum of CYP24A1 Gene in a Cohort of Italian Patients with Idiopathic Infantile Hypercalcemia

Giuseppe Grandaliano, Maddalena Gigante, Luisa Santangelo, Sterpeta Diella, Gianluca Caridi, Lucia Argentiero, Maria Michela D''Alessandro, Marida Martino, Emma Diletta Stea, Gianluigi Ardissino, Vincenza Carbone, Silvana Pepe, Domenico Scrutinio, Silvio Maringhini, Gian Marco Ghiggeri, Mario Giordano, Loreto Gesualdo

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16 Citazioni (Scopus)

Abstract

Background/Aims: Loss-of-function mutations in the CYP24A1 gene, which encodes the vitamin D-24 hydroxylase, have been recognized as a cause of elevated 1,25-dihydroxyvitamin D concentrations, hypercalcemia, hypercalciuria, nephrocalcinosis and nephrolithiasis in infants and adults. As only a case report describing 2 adult patients has been reported in Italian population, we report here the mutation analysis of CYP24A1 gene in an Italian cohort of 12 pediatric and adult patients with idiopathic infantile hypercal-cemia (IIH). Methods: We performed mutational screeningof CYP24A1 gene in a cohort of 12 Italian patients: 8 children ith nephrocalcinosis, hypercalcemia and PTH levels <10 pg/ml and 4 adult patients with nephrolithiasis, mild hypercalcemia and PTH levels <10 pg/ml from 11 unrelated Italian families. Clinical and biochemical data were collected. Genomic DNA was extracted from peripheral blood leucocytes using standard methods, and whole coding sequence of CYP24A1 gene was analysed in all patients and family membersby polymerase chain reaction and direct sequencing. The potential pathogenicity of the newly identified missense mutations was evaluated by 3 different in silico approaches(Sorting Intolerant from Tolerant, Polyphen and Mutation Taster) and by comparative analysis in 14 different species using ClustalW software. Results: CYP24A1 bi-allelic muta-
Lingua originaleEnglish
pagine (da-a)193-204
Numero di pagine12
RivistaNEPHRON JOURNALS
Volume133
DOI
Stato di pubblicazionePubblicato - 2016

Keywords

  • Adult
  • CYP24A1
  • Child
  • Child, Preschool
  • Cohort Studies
  • Female
  • Humans
  • Hypercalcemia
  • Italy
  • Male
  • Middle Aged
  • Mutation
  • Nephrocalcinosis
  • Nephrolithiasis
  • PTH
  • Pedigree
  • Vitamin D3 24-Hydroxylase
  • Young Adult

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