Publication: Venous thrombosis in a pseudohypoparathyroidism patient with a novel GNAS frameshift mutation and complete resolution of vascular calcifications with acetazolamide treatment
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Date
2023-01-01
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Abstract
Introduction: Pseudohypoparathyroidism type IA (PHP1A) is characterized by end-organ resistance to multiple hormones and Albright’s hereditary osteodystrophy (AHO). PHP1A is caused by inactivating mutations of the GNAS gene encoding the α-subunit of the stimulatory G protein (Gsα). In line with the underlying genetic defect, impaired inhibition of platelet aggregation has been demonstrated in some patients. However, no PHP1A case with thrombotic events has been described. Also, PHP1A cases typically have subcutaneous ossifications, but soft tissue calcifications are another common finding. Treatment options for those and other nonhormonal features of PHP1A are limited. Case Presentation: A female patient presented with short stature, fatigue, and exercise-induced carpopedal spasms at age 117/12 years. Diagnosis of PHP1A was made based on hypocalcemia, hyperphosphatemia, elevated serum parathyroid hormone, and AHO features, including short stature and brachydactyly. A novel frameshift variant was detected in the last exon of GNAS (c.1065_1068delGCGT, p.R356Tfs*47), showing complete loss of baseline and receptor-stimulated activity in transfected cells. The patient developed venous thrombosis and vascular and subcutaneous calcifications on both forearms after venous puncture on the right and extravasation of calcium gluconate during treatment on the left. The thrombosis and calcifications completely resolved following treatment with low-molecular-weight heparin and acetazolamide for 5 and 8 months, respectively. Conclusions: This case represents the first PHP1A patient displaying thrombosis and the first successful use of acetazolamide for PHP1A-associated soft tissue calcifications, thus providing new insights into the treatment of non-endocrinological features in this disease.
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Tıp, Dahili Tıp Bilimleri, Çocuk Sağlığı ve Hastalıkları, İç Hastalıkları, Endokrinoloji ve Metabolizma Hastalıkları, Sağlık Bilimleri, Medicine, Internal Medicine Sciences, Child Health and Diseases, Internal Diseases, Endocrinology and Metabolic Diseases, Health Sciences, Klinik Tıp (MED), Klinik Tıp, ENDOKRİNOLOJİ VE METABOLİZMA, PEDİATRİ, Clinical Medicine (MED), CLINICAL MEDICINE, ENDOCRINOLOGY & METABOLISM, PEDIATRICS, Pediatri, Perinatoloji ve Çocuk Sağlığı, Endokrinoloji, Diyabet ve Metabolizma, Endokrinoloji, Yaşam Bilimleri, Pediatrics, Perinatology and Child Health, Endocrinology, Diabetes and Metabolism, Endocrinology, Life Sciences, Acetazolamide, Calcification, Pseudohypoparathyroidism, Thrombosis, α-Subunit of the stimulatory G protein
Citation
Menevse T. S., Iwasaki Y., Abali Z. Y., Tosun B. G., Helvacioglu D., DOĞRU Ö., BUĞDAYCI O., Cyr S. M., GÜRAN T., BEREKET A., et al., "Venous Thrombosis in a Pseudohypoparathyroidism Patient with a Novel GNAS Frameshift Mutation and Complete Resolution of Vascular Calcifications with Acetazolamide Treatment", Hormone Research in Paediatrics, 2023