BACKGROUND: Mutations of the genes encoding the alpha subunit of the stimulatory G protein (Gs) and of the inhibiting Gi2 protein (GNAS1 and GNAI2 genes, respectively) have been described in various endocrine neoplasias, including pituitary tumors. AIM: To search for mutations of GNAS1 and GNAI2 in a continuous series of non-functioning pituitary adenoma (NFPA) patients neurosurgically treated. SUBJECTS AND METHODS: The surgical samples of 22 patients who have been defined and characterized on a clinical, biochemical, histological, and immunohistochemical point of view have been processed for investigating the presence of the above mutations by PCR amplification of the hot spots exons 8 and 9 of GNAS1, and exons 5 and 6 of GNAI2, followed by direct sequencing. Moreover, the promoter region of GNAI2, in order to assess the prevalence of single nucleotide polymorphisms (SNP), was investigated in the same series. RESULTS: A CGT>TGT mutation at codon 201 of GNAS1 gene in a single case of NFPA was found, but no mutation of GNAI2A was demonstrated. CONCLUSIONS: This finding suggests and confirms that G-protein mutations are rare and not crucial in NFPA development. Additionally, we found a silent SNP at codon 318 in the promoter of the Gi2alpha gene in one out of the 22 NFPA.
BACKGROUND: Mutations of the genes encoding the alpha subunit of the stimulatory G protein (Gs) and of the inhibiting Gi2 protein (GNAS1 and GNAI2 genes, respectively) have been described in various endocrine neoplasias, including pituitary tumors. AIM: To search for mutations of GNAS1 and GNAI2 in a continuous series of non-functioning pituitary adenoma (NFPA) patients neurosurgically treated. SUBJECTS AND METHODS: The surgical samples of 22 patients who have been defined and characterized on a clinical, biochemical, histological, and immunohistochemical point of view have been processed for investigating the presence of the above mutations by PCR amplification of the hot spots exons 8 and 9 of GNAS1, and exons 5 and 6 of GNAI2, followed by direct sequencing. Moreover, the promoter region of GNAI2, in order to assess the prevalence of single nucleotide polymorphisms (SNP), was investigated in the same series. RESULTS: A CGT>TGT mutation at codon 201 of GNAS1 gene in a single case of NFPA was found, but no mutation of GNAI2A was demonstrated. CONCLUSIONS: This finding suggests and confirms that G-protein mutations are rare and not crucial in NFPA development. Additionally, we found a silent SNP at codon 318 in the promoter of the Gi2alpha gene in one out of the 22 NFPA.
Authors: X Zhang; G A Horwitz; A P Heaney; M Nakashima; T R Prezant; M D Bronstein; S Melmed Journal: J Clin Endocrinol Metab Date: 1999-02 Impact factor: 5.958
Authors: Beki Kan; Christopher Esapa; Tammam Sipahi; Cevdet Nacar; Fahir Ozer; Nur Buyru Sayhan; Mehmet Yaşar Kaynar; Ali Cetin Sarioğlu; Philip Edward Harris Journal: Pituitary Date: 2003-09 Impact factor: 4.107
Authors: Paul J Newey; M Andrew Nesbit; Andrew J Rimmer; Rosie A Head; Caroline M Gorvin; Moustafa Attar; Lorna Gregory; John A H Wass; David Buck; Niki Karavitaki; Ashley B Grossman; Gilean McVean; Olaf Ansorge; Rajesh V Thakker Journal: J Clin Endocrinol Metab Date: 2013-02-28 Impact factor: 5.958