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Related Experiment Videos

Quantitative analysis of actin patch movement in yeast.

A E Carlsson1, A D Shah, D Elking

  • 1Department of Physics, Washington University, St. Louis, Missouri 63130, USA. aec@wuphys.wustl.edu

Biophysical Journal
|April 20, 2002
PubMed
Summary

Computer tracking reveals yeast cortical actin patches move randomly. Actin depolymerization with latrunculin significantly reduces movement, though some directed motion persists in treated cells.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Microscopy

Background:

  • Cortical actin patches are crucial for yeast cell polarity and morphogenesis.
  • Understanding their movement dynamics is key to elucidating cellular processes.

Purpose of the Study:

  • To develop and apply a computational method for tracking yeast cortical actin patch motion.
  • To investigate the impact of actin depolymerization on patch dynamics.

Main Methods:

  • Utilized fluorescence microscopy to capture live yeast cell movies.
  • Developed an image-processing algorithm to detect and track 2D patch coordinates.
  • Applied a minimum-distance algorithm to connect patch trajectories across frames.
  • Analyzed motion using mean-square displacements and a novel criterion for directed motion.

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Main Results:

  • Yeast cortical actin patch movement, on average, follows a random walk pattern.
  • Treatment with latrunculin (an actin-depolymerizing agent) significantly reduced the diffusion coefficient of the patches.
  • Latrunculin-treated cells exhibited lower mean-squared patch travel distances compared to control cells.
  • Patches were found to move independently, with a notable degree of directed motion observed in control cells, and a lesser extent in treated cells.

Conclusions:

  • The developed tracking method effectively quantifies actin patch dynamics.
  • Actin polymerization is essential for directed cortical actin patch movement in yeast.
  • While primarily random, directed motion plays a significant role in control cell dynamics.