GNAS mutations in adrenal aldosterone-producing adenomas

Area of Science:

• Endocrinology
• Molecular Biology
• Oncology

Background:

• GNAS gene mutations are known in pituitary tumors and recently found in cortisol-producing adenomas (CPAs).
• Mutations in CPAs involve GNAS and PRKACA genes.
• GNAS mutations had not been previously investigated in aldosterone-producing adenomas (APAs).

Purpose of the Study:

• To investigate the presence and role of GNAS gene mutations in APAs.
• To explore the co-occurrence of GNAS mutations with other known APA/CPA driver mutations.

Main Methods:

• Somatic mutation analysis of the GNAS gene in a cohort of APAs and CPAs.
• Sequencing of GNAS in 15 CPAs (overt and subclinical Cushing's syndrome) and 33 APAs.
• Analysis of KCNJ5 mutations in APAs.

Main Results:

• GNAS mutations (p.R201S, p.R201C) were found in 13% of overt and 11% of subclinical CPAs.
• GNAS mutations (p.R201C) were identified in 6% of APAs, with autonomous cortisol secretion.
• KCNJ5 mutations were present in 73% of APAs; GNAS and KCNJ5 mutations were mutually exclusive.

Conclusions:

• This study demonstrates for the first time GNAS mutations in APAs and some CPAs.
• GNAS mutations, alongside KCNJ5 and other genetic alterations, are implicated in the tumorigenesis of APAs and CPAs.
• Further research into these genetic drivers is warranted for understanding and potentially treating these adrenal tumors.