Hypoparathyroidism-sensorineural deafness-renal disease syndrome

Hypoparathyroidism-sensorineural deafness-renal disease syndrome (HDR syndrome), also known as Barakat syndrome, is a rare genetic disorder caused by mutations or deletions in the GATA3 gene located on chromosome 10p. This gene encodes a transcription factor critical for the development of the parathyroid glands, inner ear, and kidneys. The syndrome is characterized by a triad of hypoparathyroidism (underactive parathyroid glands leading to low calcium levels in the blood), bilateral sensorineural hearing loss, and renal abnormalities. Not all three features need to be present for diagnosis, and the clinical presentation can vary considerably even within the same family. The hypoparathyroidism typically manifests with symptoms of hypocalcemia, including muscle cramps, tingling, numbness, and in severe cases, seizures. Sensorineural deafness can range from mild to profound and may be present from birth or develop in early childhood. Renal anomalies are highly variable and may include renal dysplasia, hypoplasia, aplasia, vesicoureteral reflux, nephrotic syndrome, or cystic kidneys, which in some cases can progress to chronic kidney disease or renal failure. Treatment is primarily supportive and symptom-directed. Hypoparathyroidism is managed with calcium and active vitamin D (calcitriol) supplementation to maintain normal blood calcium levels. Hearing loss may be addressed with hearing aids or cochlear implants. Renal complications require monitoring and management by a nephrologist, and in severe cases, dialysis or kidney transplantation may be necessary. Genetic counseling is recommended for affected families, as the condition follows an autosomal dominant inheritance pattern with variable expressivity.

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