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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...

Embryonic Stem Cells

Embryonic Stem Cells

Embryonic stem (ES) cells were first discovered in mice in 1981 by Martin Evans. In 1998, James Thomson identified a method to isolate embryonic stem cells from humans. Human embryonic stem cells (hESCs) are obtained from 3-5 day old embryos that remain unused after an in vitro fertilization procedure.
ES cells are grown in a culture medium where they can divide indefinitely, creating ES cell lines. Under certain conditions, ES cells can differentiate, either spontaneously into a variety of...

Embryonic Stem Cells

Embryonic Stem Cells

Embryonic stem (ES) cells are undifferentiated pluripotent cells, meaning they can produce any cell type in the body. This gives them tremendous potential in science and medicine since they can generate specific cell types for use in research or to replace body cells lost due to damage or disease.

Zygotic Development And Stem Cell Formation

Zygotic Development And Stem Cell Formation

The development of all multicellular organisms starts with the fusion of haploid cells called sperm and egg to form a diploid zygote. A zygote is a totipotent cell that can develop into a complete organism. The zygote undergoes cell division or cleavage to form an 8-cell mass. Until this stage, the cells are spherical, loosely attached, and remain totipotent. Totipotent cells are capable of developing both the embryonic and the extraembryonic tissues. However, as they continue to divide, they...

Source And Potency Of Stem Cells

Source And Potency Of Stem Cells

Stem cells are undifferentiated cells with extensive self-renewal properties that help them maintain their population during the fetal and adult stages of life. They can specialize in all cell types of the human body. However, their differential potential may vary and can be classified into five types. Stem cells can be (1) Totipotent, (2) Pluripotent, (3) Multipotent, (4) Oligopotent, and (5) Unipotent. Each stem cell has a specific origin; the fertilized egg or zygote is a totipotent cell and...

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Related Experiment Video

Updated: Jun 13, 2026

Serial Enrichment of Spermatogonial Stem and Progenitor Cells (SSCs) in Culture for Derivation of Long-term Adult Mouse SSC Lines

Serial Enrichment of Spermatogonial Stem and Progenitor Cells (SSCs) in Culture for Derivation of Long-term Adult Mouse SSC Lines

Published on: February 25, 2013

Stem cells in mammalian spermatogenesis.

Shosei Yoshida¹

¹Division of Germ Cell Biology, National Institute for Basic Biology, Okazaki, Aichi, Japan. shosei@nibb.ac.jp

Development, Growth & Differentiation

|April 15, 2010

Summary

Mammalian testes rely on robust stem cells for continuous sperm production. Recent functional and molecular analyses have significantly advanced our understanding of these crucial spermatogenic stem cells.

Area of Science:

Reproductive Biology
Stem Cell Research
Developmental Biology

Background:

Mammalian testes exhibit continuous spermatogenesis, essential for reproduction.
A robust stem cell system underpins this ongoing sperm production.
Early morphological studies laid the foundation for stem cell research in testes.

Purpose of the Study:

To provide a historical overview of mammalian spermatogenesis and stem cell research.
To detail recent advancements in understanding spermatogenic stem cells.
To synthesize progress in functional and molecular analyses.

Main Methods:

Historical review of morphological analyses (1960s-70s).
Summary of functional analyses since the 1990s (e.g., transplantation, in vitro culture, lineage tracing, live imaging).

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Germ Cell Transplantation and Testis Tissue Xenografting in Mice

Germ Cell Transplantation and Testis Tissue Xenografting in Mice

Published on: February 6, 2012

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Last Updated: Jun 13, 2026

Serial Enrichment of Spermatogonial Stem and Progenitor Cells (SSCs) in Culture for Derivation of Long-term Adult Mouse SSC Lines

Serial Enrichment of Spermatogonial Stem and Progenitor Cells (SSCs) in Culture for Derivation of Long-term Adult Mouse SSC Lines

Published on: February 25, 2013

Separation of Spermatogenic Cell Types Using STA-PUT Velocity Sedimentation

Separation of Spermatogenic Cell Types Using STA-PUT Velocity Sedimentation

Published on: October 9, 2013

Germ Cell Transplantation and Testis Tissue Xenografting in Mice

Germ Cell Transplantation and Testis Tissue Xenografting in Mice

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Inclusion of molecular-genetic analyses.

Main Results:

Established the historical progression from morphological to functional and molecular studies.
Highlighted key techniques that have deepened the understanding of stem cell behavior.
Indicated significant recent progress in the field.

Conclusions:

The field has evolved from basic morphology to complex functional and genetic insights.
Recent research has greatly enhanced our knowledge of mammalian spermatogenic stem cells.
Continued investigation promises further breakthroughs in reproductive biology.