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Related Experiment Videos

Sox9 in testis determination.

Akio Kobayashi1, Hao Chang, Marie-Christine Chaboissier

  • 1Department of Molecular Genetics, University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030, USA.

Annals of the New York Academy of Sciences
|February 10, 2006
PubMed
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Sox9 is essential for male sex determination in mice. Sox9 deficiency leads to the development of ovaries instead of testes, indicating its critical role in testis formation.

Area of Science:

  • Developmental Biology
  • Genetics
  • Reproductive Biology

Background:

  • Sox9 is a gene encoding a transcriptional activator crucial for mammalian development.
  • Mutations in SOX9 cause campomelic dysplasia and can lead to sex reversal in humans.
  • Sox9 plays a role in male gonadogenesis, but its precise function in testis formation requires further elucidation.

Purpose of the Study:

  • To investigate the essential role of Sox9 in mammalian testis development.
  • To determine if Sox9 is required for the formation of testicular cords and Sertoli cell differentiation.
  • To understand how Sox9 influences the developmental trajectory of the gonad.

Main Methods:

  • Generation of Sox9 knockout mouse models, including conditional and germ-line knockouts.

Related Experiment Videos

  • In vitro culture of urogenital ridges from genetically modified mouse embryos.
  • Analysis of gonad morphology, gene expression (Sertoli cell markers, ovarian markers), and histological features.

    • Main Results:

    • Sox9 knockout mice exhibit cardiovascular defects and early embryonic lethality.
    • In vitro culture of XY Sox9-/- urogenital ridges resulted in gonads lacking testicular cords and Sertoli cell markers.
    • These Sox9-deficient gonads expressed ovarian-specific markers, suggesting a default ovarian development pathway.

    Conclusions:

    • Sox9 is indispensable for initiating and maintaining testis organogenesis in mice.
    • Sox9 acts by suppressing an intrinsic ovarian developmental program, thereby promoting testis formation.
    • These findings highlight Sox9 as a key regulator in the sex determination pathway, essential for male gonad development.