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Related Experiment Videos

How nematode sperm crawl.

Dean Bottino1, Alexander Mogilner, Tom Roberts

  • 1Department of Molecular and Cellular Biology, University of California, Berkeley, CA 94720-3112, USA.

Journal of Cell Science
|February 13, 2002
PubMed
Summary
This summary is machine-generated.

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Nematode sperm crawl using a unique major sperm protein (MSP), not actin. A new model explains how MSP filament polymerization and stored energy drive this distinct cell locomotion.

Area of Science:

  • Cell Biology
  • Biophysics
  • Biochemistry

Background:

  • Nematode sperm exhibit amoeboid motility using major sperm protein (MSP) instead of actin.
  • Unlike other eukaryotic cells, nematode sperm lack conventional molecular motors and actin-binding proteins.
  • The Ascaris suum system offers a simplified model for studying cell crawling mechanisms.

Purpose of the Study:

  • To perform a mechanochemical analysis of crawling in Ascaris suum sperm.
  • To develop a model explaining the fundamental mechanism of MSP-based cell locomotion.
  • To provide a framework for analyzing amoeboid cell motility.

Main Methods:

  • Development of a finite element model for Ascaris sperm crawling.
  • Modeling localized filament polymerization and bundling for lamellipodial extension.

Related Experiment Videos

  • Incorporating stored energy in the leading edge gel for rearward contraction.

    • Main Results:

    • The model successfully replicates key features of nematode sperm crawling.
    • Demonstrates how filament polymerization generates force for extension.
    • Shows how stored energy drives the contraction pulling the cell forward.

    Conclusions:

    • The mechanochemical model provides a robust explanation for MSP-driven amoeboid motility.
    • This study offers insights into the fundamental mechanics of cell locomotion.
    • The findings have implications for understanding actin-based cell motility in other systems.