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Sex determining gene expression during embryogenesis

R Lovell-Badge1

  • 1Laboratory of Eukaryotic Molecular Genetics, MRC National Institute for Medical Research, Mill Hill, London, U.K.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|February 27, 1993
PubMed
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The Y-linked gene Sry initiates male sex determination by directing gonadal development towards testes. This gene encodes a DNA-binding protein that influences gene expression, crucial for male development.

Area of Science:

  • Genetics
  • Developmental Biology
  • Molecular Biology

Background:

  • The Y-linked Sry gene is essential for mammalian male sex determination.
  • Sry directs gonadal development from a common precursor towards testes, overriding the default ovarian pathway.

Purpose of the Study:

  • To elucidate the mechanism by which Sry initiates testicular development.
  • To understand the molecular function and evolutionary conservation of Sry.

Main Methods:

  • Analysis of Sry gene function in gonadal differentiation.
  • In vitro DNA binding assays.
  • Sequence comparisons across species.

Main Results:

  • Sry acts cell-autonomously in Sertoli cell precursors.

Related Experiment Videos

  • Sry encodes an HMG-box DNA-binding protein that bends DNA.
  • Human SRY binds conserved DNA sequences but fails to induce sex reversal in transgenic mice.

    • Conclusions:

    • Sry initiates male development by regulating downstream genes, potentially indirectly.
    • The HMG box is the conserved functional domain of SRY.
    • Species-specific differences in SRY function exist despite conserved DNA binding.