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Familial hypomagnesemia-hypercalciuria in 2 siblings
E Kuwertz-Bröking1, S Fründ, M Bulla
1Department of Pediatrics, University Children's Hospital, University of Münster, Germany.
Clinical Nephrology
|August 28, 2001
Summary
Familial hypomagnesemia with hypercalciuria and nephrocalcinosis is a rare genetic kidney disease. A mutation in the paracellin-1 gene caused severe renal issues in two siblings, unresponsive to magnesium therapy.
Area of Science:
- Pediatric Nephrology
- Medical Genetics
Background:
- Familial hypomagnesemia-hypercalciuria with nephrocalcinosis and renal insufficiency in childhood is a rare genetic disorder.
- This condition is characterized by renal calcium and magnesium wasting, leading to nephrocalcinosis and kidney dysfunction.
Observation:
- Two siblings from consanguineous parents presented with severe renal insufficiency and bilateral nephrocalcinosis.
- Biochemical analyses revealed hypomagnesemia, hypercalciuria, tubular and glomerular proteinuria, and low urinary citrate excretion.
- Kidney histology in the more severely affected boy showed medullary nephrocalcinosis, tubular atrophy, fibrosis, and glomerulosclerosis.
Findings:
- Genetic analysis identified a homozygous frameshift mutation in the paracellin-1 gene in both affected siblings.
- Treatment with sodium bicarbonate, vitamin D analogs, thiazide diuretics, citrate, and magnesium partially reduced hypercalciuria but did not correct hypomagnesemia.
- The boy progressed to hemodialysis, while his sister's renal function remained stable during follow-up.
Implications:
- This study highlights the critical role of paracellin-1 in renal magnesium and calcium transport.
- The findings underscore the genetic basis and variable clinical presentation of this rare kidney disease.
- Understanding the genetic defect and treatment response is crucial for managing patients with familial hypomagnesemia-hypercalciuria.