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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 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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Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each...
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Eukaryotic cells have different motor proteins for transporting various cargo within the cell. These motor proteins differ based on the filament they associate with, the direction they move within the cell, and the type of cargo they transport. Motor proteins that associate with microtubules are known as microtubule-associated motor proteins. There are two families of microtubule-associated motor proteins —Kinesins and Dyneins. Both these proteins assist in the transport of cellular...
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Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
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A Seminiferous Tubule Squash Technique for the Cytological Analysis of Spermatogenesis Using the Mouse Model
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Dynamin 2 is essential for mammalian spermatogenesis.

Kate A Redgrove1,2, Ilana R Bernstein1,2, Victoria J Pye1,2

  • 1School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia.

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Dynamin-2 (DNM2) is crucial for male fertility. Its absence in germ cells causes meiotic arrest, loss of sperm cells, and sterility, highlighting DNM2

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Area of Science:

  • Reproductive biology
  • Cell biology
  • Molecular genetics

Background:

  • Dynamin proteins regulate membrane dynamics and endocytosis, particularly in neurons.
  • Dynamin 1 (DNM1) and Dynamin 2 (DNM2) are implicated in sperm function.
  • The specific roles of dynamins in developing testicular germ cells remain largely uncharacterized.

Purpose of the Study:

  • To investigate the function of Dynamin 2 (DNM2) in spermatogenesis using a germ cell-specific knockout model.
  • To elucidate the consequences of DNM2 deficiency on male germ cell development and fertility.

Main Methods:

  • Generation and analysis of a germ cell-specific DNM2 knockout mouse model.
  • Histological examination of testicular tissues to assess germ cell development.
  • Evaluation of fertility and sperm parameters in knockout mice.

Main Results:

  • Ablation of DNM2 in early spermatogenesis leads to germ cell arrest at prophase I of meiosis.
  • Complete loss of post-meiotic germ cells and sterility were observed in DNM2 knockout mice.
  • Progressive loss of spermatogonial stem cells and a Sertoli cell-only phenotype were noted with age.

Conclusions:

  • DNM2 is essential for successful spermatogenesis, including meiosis and stem cell maintenance.
  • DNM2 activity is regulated by phosphorylation (via CDK1) in spermatogonia and dephosphorylation (via PPP3CA) during later stages.
  • DNM2 deficiency results in male infertility and progressive testicular degeneration.