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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...

The Y Chromosome Determines Maleness

The Y Chromosome Determines Maleness

The Y chromosome is a sex chromosome found in several vertebrates and mammals, including humans. In addition to 22 pairs of autosomes, the human males have one X chromosome and one Y chromosome. In these organisms, the presence or absence of the Y chromosome determines the development of male traits.
Evolution
Around 300 million years ago, the two sex chromosomes diverged from two identical autosomal chromosomes. Over time, the Y chromosome has lost most of its genes, shrinking in size. Today,...

The Ratio of X Chromosome to Autosomes

The Ratio of X Chromosome to Autosomes

In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...

Dosage Compensation

Dosage Compensation

In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with distinct numbers of X chromosomes will have...

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...

Development of the Sexual Organs in the Embryo and Fetus

Development of the Sexual Organs in the Embryo and Fetus

Development of the reproductive organs in an embryo starts from a bipotential state. This means the early embryo can develop either male or female reproductive organs. The formation of these organs begins with the growth of gonadal ridges that arise from the intermediate mesoderm during the fifth week of development.
Near the gonadal ridges, two duct systems are present: the mesonephric ducts (Wolffian ducts) and paramesonephric ducts (Müllerian ducts). These ducts form the basis for the male...

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Related Experiment Video

Updated: Jul 24, 2026

Using Ex Vivo Upright Droplet Cultures of Whole Fetal Organs to Study Developmental Processes during Mouse Organogenesis

Using Ex Vivo Upright Droplet Cultures of Whole Fetal Organs to Study Developmental Processes during Mouse Organogenesis

Published on: October 21, 2015

[Advances in gonadal differentiation regulated by SRY].

Yingxia Cui¹, Yufeng Huang

¹Laboratory of Reproduction & Genetics, Nanjing General Hospital of Nanjing Command, PLA, Nanjing, Jiangsu 210002, China.

Zhonghua Nan Ke Xue = National Journal of Andrology

|June 12, 2004

Summary

Genetic factors determine human gonad development and sex determination. While the SRY gene initiates testicular differentiation, its mutations only explain some 46,XY sex reversal cases, indicating other crucial genes remain undiscovered.

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Area of Science:

Genetics
Developmental Biology
Molecular Biology

Context:

Human sex determination is a complex genetic process.
Gonadal differentiation relies on specific gene cascades, notably involving the SRY gene on the Y chromosome.
A significant portion of 46,XY sex reversal cases remain unexplained by SRY mutations.

Purpose:

To explore the genetic underpinnings of gonadal differentiation beyond the SRY gene.
To investigate potential novel genes involved in testicular development.
To understand the nuclear import pathways crucial for SRY function.

Summary:

Gonadal differentiation is genetically controlled, with the SRY gene initiating testicular development in humans.
The SRY gene requires specific nuclear import pathways for its function.
The discovery of additional genes influencing sex determination is critical, as SRY mutations do not account for all 46,XY sex reversal cases.

Impact:

Highlights the need for further research into the genetic regulation of sex determination.
Suggests potential new targets for understanding and diagnosing disorders of sex development.
Advances the understanding of molecular mechanisms in early human development.