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Sox8 and Sertoli-cell function.

Claire L Kennedy1, Peter Koopman, Yuji Mishina

  • 1Monash Institute of Medical Research, Monash University, Melbourne, Australia. moira.obryan@med.monash.edu.au

Annals of the New York Academy of Sciences
|October 2, 2007
PubMed
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The transcription factor SOX8 is crucial for maintaining male fertility. Its absence leads to progressive seminiferous tubule failure and infertility in adult males.

Area of Science:

  • Genetics
  • Reproductive Biology
  • Molecular Biology

Background:

  • SOX8 is a transcription factor within the high mobility group (HMG) superfamily.
  • It is expressed during development and specifically in males during sex determination.
  • Initial hypotheses suggested SOX8 inactivation would impact sex determination.

Purpose of the Study:

  • To investigate the role of SOX8 in male sexual development and fertility.
  • To determine the consequences of SOX8 gene inactivation on the male reproductive system.

Main Methods:

  • Generation and analysis of SOX8 knockout male mice.
  • Assessment of sexual development, reproductive success, and testicular histology.
  • Evaluation of spermatogenic cycle, sperm quality, and Sertoli cell function.

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Main Results:

  • SOX8 knockout males exhibited normal sexual development but progressive seminiferous tubule failure.
  • Infertility increased with age, correlating with seminiferous epithelium degeneration.
  • Spermatogenic dysregulation, including sloughing and spermiation failure, was observed.
  • Sperm from knockout males showed age-dependent decreases in motility and number.

Conclusions:

  • SOX8 plays a critical role in adult Sertoli cell function.
  • Elimination of SOX8 leads to progressive male infertility.
  • SOX8-regulated genes are essential for maintaining male reproductive health.