Related Experiment Videos
An association between neonatal severe primary hyperparathyroidism and familial hypocalciuric hypercalcemia in three
Insights
Neonatal severe primary hyperparathyroidism cases were linked to familial hypocalciuric hypercalcemia in three kindreds. This suggests a shared genetic cause for these two rare conditions.
Area of Science:
- Endocrinology
- Genetics
- Pediatrics
Background:
- Neonatal severe primary hyperparathyroidism is a rare, life-threatening condition.
- Familial hypocalciuric hypercalcemia (FHH) is an autosomal dominant disorder characterized by hypercalcemia and low urinary calcium excretion.
Observation:
- Four cases of neonatal severe primary hyperparathyroidism were identified within three families.
- Each family also exhibited features consistent with familial hypocalciuric hypercalcemia.
- Affected relatives showed hypercalcemia, often diagnosed before age 10, and hypocalciuric hypercalcemia.
Findings:
- The co-occurrence of neonatal severe primary hyperparathyroidism and familial hypocalciuric hypercalcemia within these kindreds was observed.
- Relatives displayed persistent hypercalcemia and abnormal serum calcium levels even after parathyroidectomy.
- Diagnosis of FHH was supported by widespread hypercalcemia across generations and low urinary calcium.
Implications:
- The findings suggest a potential shared genetic etiology underlying both neonatal severe primary hyperparathyroidism and familial hypocalciuric hypercalcemia within affected families.
- This association may provide insights into the genetic mechanisms of calcium homeostasis and parathyroid gland function.
- Further genetic studies are warranted to identify the specific genes responsible for these linked conditions.
Abstract:
Four cases of neonatal severe primary hyperparathyroidism occurred in three families; familial hypocalciuric hypercalcemia was present in each kindred. The diagnosis of familial hypocalciuric hypercalcemia was based on the following features; hypercalcemia in many relatives (eight to 16 per kindred), without other features of the multiple endocrine neoplasia syndromes; recognition of hypercalcemia before the age of 10 in one to three relatives; hypocalciuric hypercalcemia in all relatives tested (five to 14 per kindred); and abnormal serum calcium levels despite parathyroidectomy in all additional relatives (one to five per kindred) undergoing this operation. The association of two uncommon syndromes (neonatal severe primary hyperparathyroidism and familial hypocalciuric hypercalcemia) in these kindreds suggests that the two syndromes share a common genetic cause within each kindred.