Familial isolated hypoparathyroidism due to agenesis of parathyroid gland

Familial isolated hypoparathyroidism due to agenesis of the parathyroid glands is an extremely rare genetic condition in which the parathyroid glands fail to develop (agenesis), resulting in deficient or absent production of parathyroid hormone (PTH). PTH is essential for maintaining calcium and phosphorus balance in the body. Without adequate PTH, affected individuals develop hypocalcemia (low blood calcium) and hyperphosphatemia (high blood phosphorus), which can lead to a range of symptoms including muscle cramps, tingling and numbness in the hands, feet, and around the mouth (paresthesias), tetany (involuntary muscle contractions), and seizures. In severe neonatal cases, life-threatening hypocalcemic episodes may occur shortly after birth. The condition primarily affects the endocrine and musculoskeletal systems, and chronic hypocalcemia can also impact the nervous system, heart, kidneys, and eyes (e.g., cataracts with prolonged disease). This form of hypoparathyroidism is distinguished from other causes by its familial occurrence and the congenital absence of parathyroid gland tissue, without other associated developmental anomalies (such as those seen in DiGeorge syndrome). Mutations in genes critical for parathyroid gland development, including GCM2 (GCMB), have been identified in some families. The inheritance pattern can vary depending on the specific genetic defect involved. Treatment focuses on lifelong calcium and active vitamin D (calcitriol) supplementation to maintain normal serum calcium levels and prevent complications. Regular monitoring of blood calcium, phosphorus, and renal function is essential. Recombinant PTH therapy may be considered in refractory cases. Early diagnosis and consistent management can significantly improve quality of life and reduce the risk of serious complications such as seizures, cardiac arrhythmias, and renal calcifications.

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