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Generation of Porcine Testicular Organoids with Testis Specific Architecture using Microwell Culture
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CDC42 Negatively Regulates Testis-Specific SEPT12 Polymerization.

Chia-Yen Huang1,2,3, Ya-Yun Wang4, Ying-Liang Chen5

  • 1Department of Biological Science and Technology, National Chiao Tung University, Hsinchu 300, Taiwan. bagiao2003@gmail.com.

International Journal of Molecular Sciences
|September 8, 2018
PubMed
Summary
This summary is machine-generated.

CDC42 negatively regulates SEPT12 polymerization, impacting sperm head formation. This discovery is crucial for understanding male infertility and sperm development.

Keywords:
CDC42SEPTSEPT12sperm

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Area of Science:

  • Cell Biology
  • Reproductive Biology
  • Cytoskeletal Dynamics

Background:

  • Septins (SEPT) are GTP-binding proteins essential for cell structure and function.
  • Mutations in SEPTIN12 are linked to male infertility, causing abnormal sperm morphology and motility.
  • Regulators of SEPT12 function, particularly in male germ cell differentiation, remain largely unknown.

Purpose of the Study:

  • To investigate the role of CDC42 in regulating SEPT12 polymerization.
  • To determine if CDC42 is involved in the terminal differentiation of male germ cells.
  • To elucidate the relationship between SEPT12 and sperm head formation.

Main Methods:

  • Scanning electron microscopy to analyze sperm head morphology in Septin12-deficient mice.
  • Immunolocalization studies to determine the cellular localization of CDC42 and SEPT12.
  • Ectopic expression analysis of wild-type and mutant CDC42 to assess its effect on SEPT12 polymerization.

Main Results:

  • Loss of Septin12 resulted in defective sperm head formation, highlighting SEPT12's critical role.
  • CDC42 and SEPT12 exhibited similar localization patterns in developing and mature sperm.
  • Wild-type and a constitutively active mutant of CDC42 repressed SEPT12 polymerization, while a dominant-negative mutant did not.

Conclusions:

  • CDC42 acts as a negative regulator of SEPT12 polymerization.
  • CDC42 is involved in the terminal structure formation of sperm heads.
  • Understanding the CDC42-SEPT12 interaction provides insights into male germ cell differentiation and potential causes of infertility.