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Mutational analysis of GNAS1 in patients with pseudohypoparathyroidism: identification of two novel mutations.
J Clin Endocrinol Metab. 2000 Nov; 85(11):4243-8.JC

Abstract

Pseudohypoparathyroidism (PHP) refers to two major variants that generally coexist in the same family, PHP type Ia (PHP Ia), in which both PTH resistance and a constellation of physical features, termed Albright's hereditary osteodystrophy (AHO), are present, and pseudopseudohypoparathyroidism (PPHP), in which AHO occurs without PTH resistance. Most patients with PHP Ia show a partial deficiency (50%) of Gs activity, due to loss of function mutations in Gsalpha gene (GNAS1). The present study reports clinical, biochemical, and molecular data of 8 unrelated families with PHP Ia and PPHP. The 13 exons of GNAS1 were screened for mutations by PCR and direct sequencing of the amplified products. We detected heterozygous mutations in the affected members of the 4 families in which PHP Ia was present. In 2 families 2 previously reported deletions in exons 5 and 7 were found, whereas in the other 2 families, 2 novel frameshift deletions were identified in exons 1 and 11, causing a premature stop codon in the mutant allele. No mutation was detected in the families in which PPHP was the only clinical manifestation. In conclusion, we report the first mutational analysis of Italian patients with PHP Ia and PPHP, and we describe two novel deletions in GNAS1. Furthermore, we confirm that these mutations cannot be detected in families with isolated PPHP, suggesting that these forms of AHO are genetically distinct from PHP Ia.

Authors+Show Affiliations

Ospedale Maggiore IRCCS, Institute of Endocrine Sciences, University of Milan, Italy.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

11095461

Citation

Mantovani, G, et al. "Mutational Analysis of GNAS1 in Patients With Pseudohypoparathyroidism: Identification of Two Novel Mutations." The Journal of Clinical Endocrinology and Metabolism, vol. 85, no. 11, 2000, pp. 4243-8.
Mantovani G, Romoli R, Weber G, et al. Mutational analysis of GNAS1 in patients with pseudohypoparathyroidism: identification of two novel mutations. J Clin Endocrinol Metab. 2000;85(11):4243-8.
Mantovani, G., Romoli, R., Weber, G., Brunelli, V., De Menis, E., Beccio, S., Beck-Peccoz, P., & Spada, A. (2000). Mutational analysis of GNAS1 in patients with pseudohypoparathyroidism: identification of two novel mutations. The Journal of Clinical Endocrinology and Metabolism, 85(11), 4243-8.
Mantovani G, et al. Mutational Analysis of GNAS1 in Patients With Pseudohypoparathyroidism: Identification of Two Novel Mutations. J Clin Endocrinol Metab. 2000;85(11):4243-8. PubMed PMID: 11095461.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Mutational analysis of GNAS1 in patients with pseudohypoparathyroidism: identification of two novel mutations. AU - Mantovani,G, AU - Romoli,R, AU - Weber,G, AU - Brunelli,V, AU - De Menis,E, AU - Beccio,S, AU - Beck-Peccoz,P, AU - Spada,A, PY - 2000/11/30/pubmed PY - 2001/2/28/medline PY - 2000/11/30/entrez SP - 4243 EP - 8 JF - The Journal of clinical endocrinology and metabolism JO - J. Clin. Endocrinol. Metab. VL - 85 IS - 11 N2 - Pseudohypoparathyroidism (PHP) refers to two major variants that generally coexist in the same family, PHP type Ia (PHP Ia), in which both PTH resistance and a constellation of physical features, termed Albright's hereditary osteodystrophy (AHO), are present, and pseudopseudohypoparathyroidism (PPHP), in which AHO occurs without PTH resistance. Most patients with PHP Ia show a partial deficiency (50%) of Gs activity, due to loss of function mutations in Gsalpha gene (GNAS1). The present study reports clinical, biochemical, and molecular data of 8 unrelated families with PHP Ia and PPHP. The 13 exons of GNAS1 were screened for mutations by PCR and direct sequencing of the amplified products. We detected heterozygous mutations in the affected members of the 4 families in which PHP Ia was present. In 2 families 2 previously reported deletions in exons 5 and 7 were found, whereas in the other 2 families, 2 novel frameshift deletions were identified in exons 1 and 11, causing a premature stop codon in the mutant allele. No mutation was detected in the families in which PPHP was the only clinical manifestation. In conclusion, we report the first mutational analysis of Italian patients with PHP Ia and PPHP, and we describe two novel deletions in GNAS1. Furthermore, we confirm that these mutations cannot be detected in families with isolated PPHP, suggesting that these forms of AHO are genetically distinct from PHP Ia. SN - 0021-972X UR - https://www.unboundmedicine.com/medline/citation/11095461/Mutational_analysis_of_GNAS1_in_patients_with_pseudohypoparathyroidism:_identification_of_two_novel_mutations_ L2 - https://academic.oup.com/jcem/article-lookup/doi/10.1210/jcem.85.11.6986 DB - PRIME DP - Unbound Medicine ER -