The Endocrinological Basis for Polycystic Ovary Syndrome: An Evolutionary Perspective

Area of Science:

• Reproductive endocrinology
• Evolutionary medicine
• Metabolic disorders

Background:

• Polycystic ovary syndrome (PCOS) is a common endocrinopathy in reproductive-aged women.
• PCOS is characterized by hyperandrogenism, insulin resistance, and abdominal fat accumulation.
• These metabolic and endocrine features are linked to adipose tissue characteristics and genetic/epigenetic factors.

Purpose of the Study:

• To examine the evolutionary origins of PCOS risk.
• To explore how environmental mismatches potentiate PCOS in modern populations.
• To understand the survival-reproduction trade-offs in PCOS from an evolutionary perspective.

Main Methods:

• Review of recent studies on physiological and behavioral differences between populations.
• Analysis of survival-reproduction trade-offs in nonhuman mammals.
• Examination of PCOS models in animal studies (prenatally testosterone-treated and naturally hyperandrogenic models).

Main Results:

• Evolutionary theory suggests PCOS traits may originate from ancestral survival advantages (e.g., starvation, infection defense, muscularity).
• These adaptations, however, can reduce reproductive capacity (oligo-anovulation).
• Environmental mismatches, like obesity and inactivity, exacerbate PCOS risk.

Conclusions:

• PCOS risk is influenced by a combination of adaptive physiological systems and environmental factors.
• Understanding the evolutionary past of PCOS can inform current research and therapeutic strategies.
• Ancient developmental-metabolic strategies may underlie modern PCOS manifestations.