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Related Concept Videos

Formation of Higher-order Actin Filaments01:11

Formation of Higher-order Actin Filaments

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The polymerization of G-actin monomers into filamentous F-actin is a multi-step process. Once the F-actins are formed, they can bundle together in different arrangements to form higher-order networks and regulate cellular functions. Common examples include the formation of lamellipodia and filopodia at the cell's leading edge by actin reorganization in a migrating cell. The microvilli on the brush border epithelial cells are also formed through the F-actin network.
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The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
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Topographic surveying is critical for documenting the Earth's surface, focusing on capturing elevations, slopes, and natural and man-made features. It is essential in construction planning, water resource management, and land-use analysis. The primary outcome of such surveys is a topographic map, which uses contour lines to visually represent the shape and slope of the terrain, providing valuable insights into the landscape's characteristics.Contour lines are fundamental to understanding the...
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Related Experiment Video

Updated: May 5, 2026

Tuning the Contractility and Deformation Modes of Active Actin-Based Assemblies In Vitro: From Two-Dimensional Active Networks to Liquid Crystal Drops
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3D actin network centerline extraction with multiple active contours.

Ting Xu1, Dimitrios Vavylonis2, Xiaolei Huang1

  • 1Department of Computer Science and Engineering, Lehigh University, Bethlehem, PA, USA.

Medical Image Analysis
|December 10, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces a semi-automated method using Stretching Open Active Contours (SOACs) to analyze 2D and 3D actin networks from fluorescence microscopy images. The technique accurately extracts filament centerlines and topology, enabling quantitative biological research.

Keywords:
Actin filamentsActive contoursCurvilinear networksCytoskeletonNormalized cuts

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Area of Science:

  • Cell Biology
  • Biophysics
  • Image Analysis

Background:

  • Quantitative analysis of cytoskeletal polymer networks (actin filaments, actin cables) in 2D and 3D fluorescence microscopy images is challenging.
  • Existing methods struggle with low signal-to-noise ratio (SNR) and complex network topologies.

Purpose of the Study:

  • To develop a semi-automated, reproducible, and objective method for extracting actin network topology from fluorescence microscopy data.
  • To facilitate quantitative analysis of cytoskeletal structures in biological research.

Main Methods:

  • Utilized multiple Stretching Open Active Contours (SOACs) initialized at image intensity ridges.
  • SOACs evolve along filament centerlines, with capabilities for merging, stopping at junctions, and reconfiguring for smooth crossings.
  • Applied the method to synthetic images, 2D Total Internal Reflection Fluorescence Microscopy (TIRFM) images, and 3D spinning disk confocal microscopy images of fission yeast.

Main Results:

  • Successfully extracted centerlines and topology of curvilinear networks, even with low SNR.
  • Quantitative evaluation on synthetic images (SNR > 5.0) showed an average vertex error of 1 voxel and Hausdorff distance below 10 voxels.
  • Demonstrated applicability across different imaging modalities and biological samples.

Conclusions:

  • The proposed SOAC-based method provides accurate and robust extraction of 3D actin network topology.
  • This approach enhances quantitative analysis of cytoskeletal structures, supporting reproducible biological research.
  • The method is broadly applicable to various curvilinear network imaging challenges.