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Related Concept Videos

Spermatogenesis01:22

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...
Spermatogenesis01:41

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...
Meiosis I03:09

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...
The Ratio of X Chromosome to Autosomes02:45

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...

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Related Experiment Video

Updated: Jun 29, 2026

Transgenic Rodent Assay for Quantifying Male Germ Cell Mutant Frequency
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GermSAGE: a comprehensive SAGE database for transcript discovery on male germ cell development.

Tin-Lap Lee1, Hoi-Hung Cheung, Janek Claus

  • 1Section on Developmental Genomics, Laboratory of Clinical Genomics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA.

Nucleic Acids Research
|October 4, 2008
PubMed
Summary

GermSAGE is a new database detailing mouse male germ cell gene expression. This resource aids in understanding cell development and discovering new genes.

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Area of Science:

  • Reproductive Biology
  • Genomics
  • Bioinformatics

Background:

  • Understanding gene expression is crucial for deciphering male germ cell development.
  • Existing resources may lack comprehensive transcriptome data across key developmental stages.

Purpose of the Study:

  • To introduce GermSAGE, a web-based database of mouse male germ cell gene expression.
  • To provide tools for analyzing and comparing transcriptome data from different germ cell types.

Main Methods:

  • Utilized Serial Analysis of Gene Expression (SAGE) to generate transcriptome data.
  • Compiled data from type A spermatogonia, pachytene spermatocytes, and round spermatids.
  • Developed web-based tools for data browsing, comparison, and searching with customizable parameters.

Main Results:

  • GermSAGE contains approximately 150,000 SAGE sequence tags per library.
  • A total of 452,095 tags were analyzed from three distinct male germ cell stages.
  • Data visualization options include tabulated formats and alignment with the UCSC genome browser.

Conclusions:

  • GermSAGE offers a valuable platform for studying gene regulatory networks in male germ cell development.
  • The database facilitates novel gene discovery related to spermatogonial renewal and differentiation.
  • GermSAGE is freely accessible, promoting research in reproductive biology and genomics.