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Measuring Axonal Cargo Transport in Mouse Primary Cortical Cultured Neurons
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Outer kinetochore proteins form linear elements to regulate vesicle transport.

Shane J Kowaleski1, Alexis Bridgewater1, Cody Saraceno1

  • 1Department of Obstetrics and Gynecology, C.S. Mott Center for Human Growth and Development, Wayne State University School of Medicine, Detroit, MI 48201, USA.

Journal of Cell Science
|April 13, 2026
PubMed
Summary
This summary is machine-generated.

Linear elements, associated with outer kinetochore proteins, organize vesicle transport during C. elegans oocyte division. This microtubule-dependent process is crucial for extracellular matrix formation and oocyte development.

Keywords:
Linear elementOocyteOuter kinetochoreVesicle transport

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Molecular Biology

Background:

  • Chromosome segregation regulators have roles in vesicle trafficking for cytokinesis.
  • In C. elegans oocytes, anaphase I involves chromosome segregation coordinated with vesicle trafficking for polar body extrusion and extracellular matrix secretion.

Purpose of the Study:

  • To investigate the function of mysterious "linear element" structures, where outer kinetochore proteins localize prior to anaphase.
  • To elucidate the mechanism by which linear elements facilitate vesicle transport for oocyte development.

Main Methods:

  • Observation of linear element formation and dynamics in C. elegans oocytes.
  • Analysis of interactions between linear elements, microtubules, endoplasmic reticulum, and cortical granule secretory vesicles.
  • Genetic manipulation (knockdown and depletion) of outer kinetochore proteins and microtubule-binding components.

Main Results:

  • Linear elements form from puncta to elongated structures, clustering with cortical granule secretory vesicles.
  • Microtubules are essential for linear element assembly, motility, and vesicle transport.
  • Depletion of outer kinetochore proteins disrupts extracellular matrix formation, highlighting the role of linear elements in vesicle distribution.

Conclusions:

  • Linear elements act as crucial intermediates, mediating microtubule-dependent transport of vesicles for proper cortical distribution.
  • This process is vital for the formation of the extracellular matrix and overall oocyte development.