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Spermatogenesis

Spermatogenesis

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 reproductive...

Spermatogenesis

Spermatogenesis

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...

Meiosis I

Meiosis I

Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by a...

Meiosis I

Meiosis I

Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...

Fertilization

Fertilization

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...

Meiosis II

Meiosis II

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 containing...

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Related Experiment Video

Updated: Jun 22, 2026

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

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

Published on: February 6, 2018

Coordinating cellular events during spermatogenesis: a biochemical model.

Pearl P Y Lie¹, C Yan Cheng, Dolores D Mruk

¹Center for Biomedical Research, New York, NY 10065, USA.

Trends in Biochemical Sciences

|June 19, 2009

Summary

This summary is machine-generated.

Mitogen-activated protein kinases (MAPKs) coordinate blood-testis barrier (BTB) restructuring and spermiation. This synchronization ensures germ cell cycle progression for meiosis and maintains male fertility.

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Last Updated: Jun 22, 2026

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

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

Published on: February 6, 2018

Cytological Analysis of Spermatogenesis: Live and Fixed Preparations of Drosophila Testes

Cytological Analysis of Spermatogenesis: Live and Fixed Preparations of Drosophila Testes

Published on: January 20, 2014

Isolation of Murine Spermatogenic Cells using a Violet-Excited Cell-Permeable DNA Binding Dye

Isolation of Murine Spermatogenic Cells using a Violet-Excited Cell-Permeable DNA Binding Dye

Published on: January 14, 2021

Area of Science:

Reproductive Biology
Cell Biology
Biochemistry

Background:

Spermatogenesis requires germ cells to cross the blood-testis barrier (BTB).
This process involves cell junction remodeling and coordination with germ cell cycle progression.
Mitogen-activated protein kinases (MAPKs) are implicated in germ cell adhesion and movement.

Purpose of the Study:

To explain how BTB restructuring and spermiation are coordinated during spermatogenesis.
To elucidate the role of MAPKs in synchronizing these events.

Main Methods:

Biochemical modeling was employed to analyze the coordination of cellular events.
The study focused on the role of cell-cycle-associated kinases and phosphatases, particularly MAPKs.

Main Results:

A biochemical model was proposed to explain the coordination between BTB restructuring and spermiation.
MAPKs are suggested to synchronize primary spermatocyte cell cycle progression with junction remodeling and migration across the BTB.

Conclusions:

MAPKs play a crucial role in coordinating BTB remodeling and germ cell migration.
This coordination is essential for maintaining spermatogenesis and male fertility.