Follow-up Findings in a Turkish Girl with Pseudohypoparathyroidism Type Ia Caused by a Novel Heterozygous Mutation in the GNAS Gene.

Abstract

Pseudohypoparathyroidism type Ia (PHP-Ia) is characterized by multihormone resistance and an Albright hereditary osteodystrophy (AHO) phenotype. It is caused by heterozygous mutations in GNAS gene. Clinical and biochemical findings of a female PHP-Ia patient were evaluated from age of diagnosis (6.5 years) to 14.5 years of age. The patient had short stature, brachydactyly, and subcutaneous heterotopic ossifications. Serum calcium and phosphorus levels were normal, but parathyroid hormone levels were high. Based on the typical clinical findings of AHO phenotype and biochemical findings, she was diagnosed as having PHP-Ia. A novel heterozygous mutation (c.128T>C) was found in the GNAS gene. Follow-up examinations revealed resistance to thyroid-stimulating hormone and a bioinactive growth hormone. Clinicians should take into consideration PHP-Ia in patients referred with short stature, and patients with an AHO phenotype must be further evaluated for hormone resistance, GNAS gene mutation, Gsα activity. To our knowledge, this is the first case report describing bioinactive growth hormone in PHP-Ia.

• Authors: Sezgin Şahin, Olaf Hiort, Susanne Thiele, Olcay Evliyaoğlu, Beyhan Tüysüz
• Journal: Journal of clinical research in pediatric endocrinology (J Clin Res Pediatr Endocrinol) Vol. 9 Issue 1 Pg. 74-79 (Mar 01 2017) ISSN: 1308-5735 [Electronic] Turkey
• PMID: 27425121 (Publication Type: Case Reports, Journal Article)

Chemical References

• Chromogranins
• GNAS protein, human
• GTP-Binding Protein alpha Subunits, Gs

Topics

• Adolescent
• Child
• Chromogranins (genetics)
• DNA Mutational Analysis
• Female
• Follow-Up Studies
• GTP-Binding Protein alpha Subunits, Gs (genetics)
• Genetic Predisposition to Disease (genetics)
• Heterozygote
• Humans
• Mutation
• Pseudohypoparathyroidism (classification, diagnosis, genetics)
• Turkey