Cushing syndrome: Old and new genes.

Area of Science:

• Endocrinology
• Medical Genetics
• Oncology

Background:

• Cushing syndrome (CS) is characterized by hypercortisolemia, stemming from either external factors or internal overproduction of cortisol.
• Endogenous CS arises from ACTH-dependent (pituitary or ectopic sources) or ACTH-independent (adrenal) mechanisms.
• The genetic underpinnings of CS pathogenesis are increasingly recognized.

Purpose of the Study:

• To delineate the genetic factors contributing to Cushing syndrome.
• To understand the role of germline and somatic gene mutations in pituitary and adrenal tumorigenesis within CS.

Main Methods:

• Review of current literature on genetic defects in Cushing syndrome.
• Analysis of known germline gene mutations (e.g., MEN1, AIP, PRKAR1A).
• Examination of somatic gene mutations (e.g., USP8, TP53) in pituitary and adrenal tumors.

Main Results:

• Germline mutations in genes like MEN1, AIP, and PRKAR1A are associated with hereditary forms of CS, often involving pituitary or adrenal tumors.
• Somatic mutations in genes such as USP8 and TP53 are frequently identified in pituitary and adrenal tumors in CS patients.
• These genetic defects provide insights into the molecular pathways driving tumor development in CS.

Conclusions:

• Genetic mutations play a critical role in the development of Cushing syndrome.
• Understanding these genetic defects is crucial for diagnosing and potentially treating CS and associated tumors.
• Further research into these pathways can illuminate novel therapeutic targets for pituitary and adrenal tumors.