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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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Spermatogenesis01:22

Spermatogenesis

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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.
The process of spermatogenesis can be divided into mitosis, meiosis, and spermiogenesis. During mitosis, the spermatogonia or stem cells divide to produce two identical daughter cells, type A and B spermatogonia. Type-A...
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Sperm Transport01:15

Sperm Transport

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The journey of sperm from its origin to the point of ejaculation begins within the seminiferous tubules of the testis. Here, Sertoli cells produce fluid that propels non-motile sperm through a series of conduits, starting with the straight tubules leading to the rete testis. This interconnected network of tubules acts as the initial pathway for sperm, guiding them into the efferent ductules and then into the epididymis for maturation.
The maturation phase occurs in the epididymis, where sperm...
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Meiosis II01:57

Meiosis II

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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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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.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
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Fertilization01:38

Fertilization

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During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
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Related Experiment Video

Updated: Feb 24, 2026

Step-specific Sorting of Mouse Spermatids by Flow Cytometry
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Spermatogonial kinetics in humans.

Sara Di Persio1, Rossana Saracino1, Stefania Fera1

  • 1Fondazione Pasteur Cenci Bolognetti, Department of Anatomical, Histological, Forensic and Orthopaedic Sciences - Section of Histology and Medical Embryology, Sapienza University of Rome, Rome 00161, Italy.

Development (Cambridge, England)
|August 23, 2017
PubMed
Summary

Researchers identified distinct human spermatogonia subpopulations using protein markers. This study proposes a new model for spermatogonial development, aiding infertility research and sperm production enhancement.

Keywords:
GFRA1HumanKITSpermatogoniaSpermatogonial differentiationStem cell renewalUCL-H1UTF1

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A Seminiferous Tubule Squash Technique for the Cytological Analysis of Spermatogenesis Using the Mouse Model
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A Seminiferous Tubule Squash Technique for the Cytological Analysis of Spermatogenesis Using the Mouse Model
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Area of Science:

  • Reproductive Biology
  • Cell Biology
  • Molecular Biology

Background:

  • The human spermatogonial compartment is vital for sperm production, but its molecular characteristics and regulation remain unclear.
  • Understanding spermatogonia is crucial for addressing male infertility and improving sperm output.

Purpose of the Study:

  • To identify and characterize distinct human spermatogonia subpopulations.
  • To elucidate the molecular signatures and developmental pathway of human spermatogonia.
  • To propose a novel scheme for human spermatogonial development.

Main Methods:

  • Analysis of human testis biopsies with normal spermatogenesis.
  • Study of marker protein expression (MAGE-A4, KIT, UCLH1, GFRA1, UTF1).

Main Results:

  • Identification of distinct spermatogonia subpopulations marked by specific proteins.
  • Proposed developmental pathway: GFRA1High Ap-d spermatogonia (including stem cells) → UTF1 expression & quiescence → GFRA1 loss & KIT expression in B spermatogonia.
  • Observation of limited proliferation in Ap-d and differentiating B spermatogonia.

Conclusions:

  • A novel molecular signature and developmental scheme for human spermatogonia is proposed.
  • This research provides a foundation for understanding male infertility and developing strategies to boost sperm production.