CYP24A1 Mutation in a Girl Infant with Idiopathic Infantile Hypercalcemia
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CYP24A1 Mutation in a Girl Infant with Idiopathic Infantile Hypercalcemia. / Madsen, Jens Otto Broby; Sauer, Sabrina; Beck, Bodo; Johannesen, Jesper.
In: JCRPE Journal of Clinical Research in Pediatric Endocrinology, Vol. 10, No. 1, 2018, p. 83-86.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - CYP24A1 Mutation in a Girl Infant with Idiopathic Infantile Hypercalcemia
AU - Madsen, Jens Otto Broby
AU - Sauer, Sabrina
AU - Beck, Bodo
AU - Johannesen, Jesper
PY - 2018
Y1 - 2018
N2 - 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.
AB - 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.
KW - Female
KW - Humans
KW - Hypercalcemia/diagnosis
KW - Infant
KW - Mutation
KW - Nephrocalcinosis/etiology
KW - Vitamin D3 24-Hydroxylase/genetics
U2 - 10.4274/jcrpe.4841
DO - 10.4274/jcrpe.4841
M3 - Journal article
C2 - 28874334
VL - 10
SP - 83
EP - 86
JO - JCRPE Journal of Clinical Research in Pediatric Endocrinology
JF - JCRPE Journal of Clinical Research in Pediatric Endocrinology
SN - 1308-5727
IS - 1
ER -
ID: 215369129