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Related Concept Videos

Spermatogenesis01:41

Spermatogenesis

106.9K
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 Structure and Semen Composition01:22

Sperm Structure and Semen Composition

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During ejaculation, males release around 2-5 milliliters of semen, which is a complex mixture of mature sperm and various fluids produced by accessory glands. The mature sperm cells measure approximately 60 micrometers in length and consist of a head, neck, midpiece, and tail. The head is flattened and tapered, measuring about 4 to 5 micrometers in length. It contains a nucleus with condensed chromosomes and an acrosome, a cap-like structure filled with enzymes essential for penetrating the...
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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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Testes: Histology01:27

Testes: Histology

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A tough, fibrous membrane, the tunica albuginea, covers the testes, extending inward to form fibrous partitions or septa, dividing them into internal compartments called lobules. Each lobule has 1 to 3 tightly coiled seminiferous tubules where sperm production occurs. These tubules merge into a tubular network at the back of the testis, known as the rete testis. It connects to 15 to 20 efferent ductules, leading to the epididymis.
The spermatogenic cells, responsible for producing sperm, are...
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Related Experiment Video

Updated: Nov 7, 2025

Phosphopeptide Analysis of Rodent Epididymal Spermatozoa
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Phosphopeptide Analysis of Rodent Epididymal Spermatozoa

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PRSS50 is a testis protease responsible for proper sperm tail formation and function.

Jason M Scovell1,2,3,4, Juan C Bournat2, Adam T Szafran2

  • 1Scott Department of Urology, Baylor College of Medicine, Houston, TX 77030, USA.

Development (Cambridge, England)
|April 29, 2021
PubMed
Summary

Protease serine 50 (PRSS50) is crucial for sperm development and fertility. Its absence causes multiple sperm flagella abnormalities and defects in sperm head and tail formation.

Keywords:
AKAP4CentrosomeH3K9me3InfertilityIκBLRWD1MMAFMidpieceMitochondriaNFκBPRSS50SEPT12Sperm tail

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Analysis of Epididymal Protein Synthesis and Secretion
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Flow Cytometric Analysis of Biomarkers for Detecting Human Sperm Functional Defects

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Related Experiment Videos

Last Updated: Nov 7, 2025

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Analysis of Epididymal Protein Synthesis and Secretion
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Analysis of Epididymal Protein Synthesis and Secretion

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Flow Cytometric Analysis of Biomarkers for Detecting Human Sperm Functional Defects
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Flow Cytometric Analysis of Biomarkers for Detecting Human Sperm Functional Defects

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Area of Science:

  • Reproductive Biology
  • Spermatogenesis
  • Molecular Genetics

Background:

  • Multiple morphological abnormalities of the sperm flagella (MMAF) significantly contribute to asthenoteratozoospermia, impacting male fertility.
  • The precise molecular mechanisms underlying sperm flagella formation and integrity are not fully understood.

Purpose of the Study:

  • To investigate the role of protease serine 50 (PRSS50) in sperm development and its potential link to MMAF.
  • To elucidate the molecular pathways involving PRSS50 in the testis.

Main Methods:

  • Utilized Prss50-null mice to study sperm morphology and fertility.
  • Analyzed gene expression related to NFκB signaling, heterochromatin maintenance, and histone modifications in Prss50-null testes.
  • Examined key proteins involved in sperm formation.

Main Results:

  • Prss50-null mice exhibited impaired fertility with significant sperm tail abnormalities, including acephalic sperm and sperm with multiple heads or tails.
  • PRSS50 activation of NFκB target genes, like LRWD1, is essential for heterochromatin maintenance in the testis.
  • Reduced PRSS50 leads to decreased LRWD1 and histone expression, with low H3K9me3 levels potentially increasing AKAP4, thereby affecting sperm formation.

Conclusions:

  • PRSS50 plays a critical role in normal sperm development and centrosome function.
  • PRSS50 influences sperm morphology through the NFκB/LRWD1/histone pathway, offering novel insights into MMAF.
  • Testis proteases like PRSS50 are vital for male fertility.