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Related Concept Videos

Spermatogenesis01:41

Spermatogenesis

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Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male...
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Spermatogenesis is a complex process that involves the development of sperm cells from undifferentiated stem cells in the seminiferous tubules of the testes. The process is essential for the production of mature and functional sperm cells that are capable of fertilizing an egg.
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Meiosis II02:02

Meiosis II

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Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
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A Seminiferous Tubule Squash Technique for the Cytological Analysis of Spermatogenesis Using the Mouse Model
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Requirement for CCNB1 in mouse spermatogenesis.

Ji-Xin Tang1,2, Jian Li1,2, Jin-Mei Cheng1,2

  • 1State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China.

Cell Death & Disease
|October 27, 2017
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Summary

Cyclin B1 (CCNB1) is essential for male germ cell proliferation in mice, preventing depletion and sterility. However, CCNB1 is not required for meiosis in spermatocytes, indicating its dispensability in later stages of spermatogenesis.

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Area of Science:

  • Reproductive biology
  • Cell cycle regulation
  • Developmental biology

Background:

  • Spermatogenesis is a complex process involving germ cell mitosis and meiosis.
  • Cyclin B1 (CCNB1) regulates the cell cycle and is vital for embryonic development.
  • The specific role of CCNB1 in mammalian spermatogenesis is not well understood.

Purpose of the Study:

  • To investigate the necessity of CCNB1 in mouse spermatogenesis.
  • To determine the function of CCNB1 in male germ cell proliferation, differentiation, and meiosis.

Main Methods:

  • Utilized conditional knockout mice lacking CCNB1 in male germ cells.
  • Analyzed the effects of CCNB1 ablation on gonocytes, spermatogonia, and spermatocytes.
  • Assessed male fertility, germ cell populations, proliferation, apoptosis, and miRNA expression.

Main Results:

  • Ablation of CCNB1 in gonocytes and spermatogonia caused sterility due to germ cell depletion.
  • CCNB1 deficiency impaired proliferation and increased apoptosis in these early germ cells.
  • CCNB1 loss in spermatogonia influenced differentiation pathways (Lin28a/let-7 miRNA).
  • CCNB1 ablation did not affect meiosis in spermatocytes or male fertility.

Conclusions:

  • CCNB1 is crucial for the proliferation of gonocytes and spermatogonia during mouse spermatogenesis.
  • CCNB1 appears dispensable for the meiotic progression of spermatocytes.
  • These findings clarify the distinct roles of CCNB1 in different stages of male germ cell development.