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CYP24A1 Mutation in a Girl Infant with Idiopathic Infantile Hypercalcemia #MMPMID28874334
Broby Madsen JO; Sauer S; Beck B; Johannesen J
J Clin Res Pediatr Endocrinol 2018[Mar]; 10 (1): 83-6 PMID28874334show ga
Idiopathic infantile hypercalcemia (IIH) was associated with vitamin-D supplementation in the 1950?s. Fifty years later, mutations in the CYP241A gene, involved in the degradation of vitamin-D, have been identified as being a part of the etiology. We report a case of a 21-month old girl, initially hospitalized due to excessive consumption of water and behavioral difficulties. Blood tests showed hypercalcemia and borderline high vitamin-D levels. Renal ultrasound revealed medullary nephrocalcinosis. An abnormality in vitamin-D metabolism was suspected and genetic testing was performed. This revealed the patient to be compound heterozygous for a common (p.E143del) and a novel (likely) disease-causing mutation (p.H83D) in the CYP24A1 gene. The hypercalcemia normalized following a calcium depleted diet and discontinuation of vitamin-D supplementation. Increased awareness of the typical symptoms of hypercalcemia, such as anorexia, polydipsia, vomiting and failure to thrive, is of utmost importance in diagnosing IHH early and preventing long-term complications such as nephrocalcinosis. Further identification of as many disease-causing mutations in the CYP24A1 gene as possible can help identification of predisposed individuals in whom vitamin-D supplementation should be reconsidered.
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J+Clin+Res+Pediatr+Endocrinol 2018 ; 10 (1): 83-6
