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Sexual differentiation.

A A Sinisi1, D Pasquali, A Notaro

  • 1Endocrinology and Medical Andrology Section, Department of Clinical and Experimental Medicine and Surgery, Second University of Naples, Naples, Italy. antonio.sinisi@unina2.it

Journal of Endocrinological Investigation
|July 2, 2003
PubMed
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Human sex development involves genetic determination and differentiation of gonads, internal, and external genitalia. Key genes and hormones orchestrate male or female development, with mutations causing ambiguous genitalia.

Area of Science:

  • Developmental Biology
  • Genetics
  • Endocrinology

Background:

  • Human sex development originates from bipotential embryonic tissues, progressing through sex determination and differentiation.
  • Genetic sex (karyotype) dictates initial gonad differentiation, with the SRY gene crucial for testis development.
  • Female development is an active pathway, not a default, involving genes like Wnt-4 and DAX-1.

Purpose of the Study:

  • To elucidate the complex cascade of genetic and hormonal events governing mammalian sex determination and differentiation.
  • To highlight the critical roles of specific genes and hormones in developing male and female phenotypes.
  • To underscore the genetic and molecular basis of disorders of sex development.

Main Methods:

  • Review of established knowledge on mammalian embryogenesis and sex differentiation pathways.

Related Experiment Videos

  • Analysis of gene functions (SRY, WT1, SOX9, Wnt-4, DAX-1) in gonadal and genital development.
  • Examination of hormonal signaling (AMH, testosterone, dihydrotestosterone) and receptor interactions (AR).

    • Main Results:

    • The SRY gene initiates testis differentiation, involving multiple supporting genes (WT1, SF-1, SOX9).
    • Hormones like Antimullerian Hormone (AMH) and testosterone are essential for internal and external genitalia differentiation.
    • Androgen receptor (AR) function and 5-alpha reductase activity are critical for male external genitalia development.

    Conclusions:

    • Mammalian sex development is a tightly regulated, multi-step process involving intricate genetic and hormonal interactions.
    • Disruptions in genes or hormonal pathways, including steroidogenic enzymes, AMH, AR, and 5-alpha reductase, lead to impaired sex differentiation and genital ambiguity.
    • Understanding these pathways is crucial for diagnosing and managing disorders of sex development.