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Gene interactions in gonadal development.

K L Parker1, A Schedl, B P Schimmer

  • 1Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas 75235, USA. kparke@mednet.swmed.edu

Annual Review of Physiology
|April 1, 1999
PubMed
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Mammalian sexual development involves sex determination and differentiation during embryogenesis. Key genes like SRY and SOX9, along with hormones, orchestrate the development of male or female phenotypes.

Area of Science:

  • Developmental Biology
  • Genetics
  • Reproductive Biology

Background:

  • Sexual dimorphism is crucial in mammalian development, with key events occurring during embryogenesis.
  • Mammalian sexual development follows two phases: sex determination (gonad fate) and sexual differentiation (phenotype development).
  • Genetic sex (Y chromosome presence/absence) dictates initial gonad differentiation into testes or ovaries.

Purpose of the Study:

  • To review the anatomical and cellular processes of sexual differentiation in mammals.
  • To discuss the roles of critical genes in mammalian sexual development.
  • To highlight the importance of gene interactions in sex determination and differentiation.

Main Methods:

  • Review of anatomical and cellular changes during sexual differentiation.

Related Experiment Videos

  • Discussion of key genes involved in mammalian sexual development: SRY, SF-1, WT1, DAX-1, and SOX9.
  • Analysis of the role of hormones produced by testes in male sexual differentiation.

    • Main Results:

    • Testicular hormones direct male sexual differentiation; absence leads to female differentiation.
    • Specific genes (SRY, SF-1, WT1, DAX-1, SOX9) are critical for sexual development.
    • Dose-dependent interactions among these genes are essential for accurate sex determination and differentiation.

    Conclusions:

    • Mammalian sexual differentiation is a complex process directed by genetic sex and hormonal signals.
    • A coordinated interplay of multiple genes is fundamental for establishing male or female phenotypes.
    • Understanding these genetic and hormonal pathways is key to comprehending mammalian reproductive development.