Naslov
A case report of an infant with idiopathic hypercalciuria and nephrolithiasis associated with CYP24A1 enzyme poliymorphism

Autori
Trutin, Ivana ; Škorić, Iva ;

Izvornik
Acta clinica Croatica (0353-9466) 60 (2021); 544-547

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
idiopathic hypercalciuria, nephrolithiasis, macrohematuria, CYP24A1, vitamin D

Sažetak
CYP24A1 is an enzyme that inactivates vitamin D and encodes vitamin D 24-hydroxylase. Mutations in this enzyme have been linked with idiopathic infantile hypercalcemia, nephrolithiasis, and nephrocalcinosis. The genetic testing for this mutation should be considered in the presence of calciuria, elevated serum calcium, elevated 1, 25- dihydroxyvitamin D, and suppressed parathyroid hormone. We present previously healthy eight- month-old male infant with macrohematuria, hypercalciuria (6 mg/kg/24h), albuminuria (54 mg/24h) and left-sided nephrolithiasis found in the urinary tract ultrasound. The values of alpha 1 microglobuline, parathyroid hormone, vitamin D, serum electrolytes, amino acids, glycols, oxalates and citrates in urine, as well as coagulation tests were normal. Genetic testing excluded suspected Dent’s disease but confirmed heterozygous missense variant CYP24A1 c.469C>T, p. (Arg157Trp) classified as polymorphism. He was treated with hydrochlorothiazide and potassium citrate. Children presenting with hypercalcemia, hypercalciuria and nephrolithiasis should be tested because of the importance of recognition, genetic diagnosis and proper treatment of CYP24A1 mutations that can present with a wide range of phenotypic presentations, from asymptomatic to chronic renal disease.

Izvorni jezik
Engleski

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