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Related Concept Videos

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...
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...
Sperm Transport01:15

Sperm Transport

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...
Fertilization01:38

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...
Diversity of Protists IV01:27

Diversity of Protists IV

Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...

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Measuring Sperm Guidance and Motility within the Caenorhabditis elegans Hermaphrodite Reproductive Tract
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Transformation: how do nematode sperm become activated and crawl?

Xuan Ma1, Yanmei Zhao, Wei Sun

  • 1Laboratory of Noncoding RNA, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.

Protein & Cell
|August 21, 2012
PubMed
Summary

Nematode sperm, unlike mammalian sperm, are amoeboid and use major sperm protein (MSP) for motility. This review explores factors activating nematode sperm and powering their unique movement.

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Area of Science:

  • Cell Biology
  • Reproductive Biology
  • Biochemistry

Background:

  • Nematode sperm exhibit unique amoeboid motility, distinct from mammalian flagellated sperm.
  • Their motility relies on major sperm protein (MSP) dynamics, not actin.
  • Sperm activation is a critical physiological transformation during spermiogenesis.

Purpose of the Study:

  • To review external and internal factors triggering nematode sperm activation.
  • To explore mechanisms powering amoeboid sperm motility.
  • To highlight key molecular components involved in nematode sperm function.

Main Methods:

  • Focuses on sperm from Caenorhabditis elegans and Ascaris suum.
  • Discusses in vitro activation using factors like Pronase and ionophores.
  • Examines in vivo activation pathways (TRY-5, SPE-8) and regulatory roles of proteases.

Main Results:

  • Identified external and internal factors activating nematode sperm.
  • Described the coupled protrusion-retraction process of MSP-based motility, reconstituted in vitro.
  • Highlighted the role of phosphorylation signals and identified key components (MPOP, MFPs, MPAK, GSP-3/4).

Conclusions:

  • Nematode sperm activation and motility are complex processes regulated by multiple factors.
  • MSP cytoskeleton dynamics are central to their unique amoeboid movement.
  • Phosphorylation signaling pathways are crucial for mediating sperm motility.