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Related Concept Videos

Spermatogenesis01:41

Spermatogenesis

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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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Microtubule Associated Motor Proteins01:32

Microtubule Associated Motor Proteins

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Eukaryotic cells have different motor proteins for transporting various cargo within the cell. These motor proteins differ based on the filament they associate with, the direction they move within the cell, and the type of cargo they transport. Motor proteins that associate with microtubules are known as microtubule-associated motor proteins. There are two families of microtubule-associated motor proteins —Kinesins and Dyneins. Both these proteins assist in the transport of cellular...
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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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Role of Myosin in Cell Migration01:18

Role of Myosin in Cell Migration

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Myosins are multimeric motor proteins involved in various cellular processes such as migration, adhesion, and proliferation. Myosin II is the most common type in animal cells, which binds and cross-links actin filaments.
Myosin II  is a hexamer comprising two heavy chains with globular heads and coiled-coil tails, two regulatory light chains, and two essential light chains. The ATPase sites on the myosin heads hydrolyze ATP, and the released phosphate generates the force for contraction....
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The Mitotic Spindle02:27

The Mitotic Spindle

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The mitotic spindle—or spindle apparatus—is a eukaryotic, cytoskeletal structure made up of long protein fibers called microtubules. Formed during cell division, the spindle separates sister chromatids and moves them to opposite ends of a parental cell, where the now individual chromosomes are distributed to two daughter cell nuclei.
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures...
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Mechanical Protein Functions01:58

Mechanical Protein Functions

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Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force. 
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Related Experiment Video

Updated: Oct 22, 2025

Functional Assessment of Kinesin-7 CENP-E in Spermatocytes Using In Vivo Inhibition, Immunofluorescence and Flow Cytometry
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Functional Assessment of Kinesin-7 CENP-E in Spermatocytes Using In Vivo Inhibition, Immunofluorescence and Flow Cytometry

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Motor Proteins and Spermatogenesis.

Siwen Wu1,2, Huitao Li1,2, Lingling Wang1,2,3

  • 1The Second Affiliated Hospital and Yuying Children's Hospital, Wenzhou Medical University, Zhejiang, China.

Advances in Experimental Medicine and Biology
|August 28, 2021
PubMed
Summary
This summary is machine-generated.

Microtubule and actin cytoskeletons in the testis, along with motor proteins, are crucial for transporting developing germ cells during spermatogenesis. Recent studies highlight their essential roles in this process.

Keywords:
Dynein 1KinesinsMotor proteinsMyosin VIIaMyosinsSpermatogenesisTestis

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Step-specific Sorting of Mouse Spermatids by Flow Cytometry
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Area of Science:

  • Cell Biology
  • Reproductive Biology
  • Cytoskeletal Dynamics

Background:

  • Mammalian cytoskeletons, specifically microtubule (MT) and actin, are polarized in the testis, unlike apolar intermediate filaments and septins.
  • These polarized cytoskeletons in Sertoli cells form tracks perpendicular to the basement membrane for motor protein-mediated cargo transport.

Purpose of the Study:

  • To review and evaluate recent findings on the essential roles of motor proteins in supporting spermatogenesis.
  • To provide a guide for future studies investigating the mechanistic roles of motor proteins in male germ cell development.

Main Methods:

  • Review of recent scientific literature focusing on cytoskeletal motor proteins and spermatogenesis.
  • Evaluation of existing data on the function of dyneins, kinesins, and myosins in germ cell transport.

Main Results:

  • Polarized MT and actin cytoskeletons facilitate directional transport of developing germ cells (spermatocytes, spermatids) via motor proteins.
  • Motor proteins, including dyneins, kinesins, and myosins, are essential for transporting germ cell cargoes across the seminiferous epithelium.
  • Developing germ cells rely on these motor proteins for transport due to their lack of motile cell ultrastructures.

Conclusions:

  • Motor proteins interacting with polarized cytoskeletons are indispensable for successful spermatogenesis.
  • Understanding these mechanisms is vital for future research and functional experiments in male reproductive biology.