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Related Concept Videos

Generation of Straight or Branched Actin Filaments01:14

Generation of Straight or Branched Actin Filaments

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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.
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
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Mechanism of Lamellipodia Formation01:31

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Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
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Actin Polymerization01:42

Actin Polymerization

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Actin polymerization occurs through the head-to-tail association of binding sites on monomeric actin or G-actin to form filamentous or F-actin. The polymerization can be divided into three phases ̶  nucleation, elongation, and steady-state phase.
The nucleation phase involves forming a stable nucleus consisting of three actin monomers to form a new actin filament. Actin-binding proteins such as formins and Arp2/3 complex help filament growth post-nucleation. The Formins form straight...
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Mechanism of Filopodia Formation01:39

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Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
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Formation of Higher-order Actin Filaments01:11

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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.
The high-order actin...
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Actin Polymerization and Cell Motility01:13

Actin Polymerization and Cell Motility

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Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate....
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Updated: Oct 27, 2025

A Time-Efficient Fluorescence Spectroscopy-Based Assay for Evaluating Actin Polymerization Status in Rodent and Human Brain Tissues
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A two-step actin polymerization mechanism drives dendrite branching.

Rebecca Shi1,2, Daniel A Kramer3, Baoyu Chen3

  • 1Department of Biology, Stanford University, Stanford, CA, 94305, USA.

Neural Development
|July 20, 2021
PubMed
Summary

Neurons form complex dendritic arbors through a coordinated process involving actin regulators. The WAVE Regulatory Complex (WRC) and UNC-34/Ena/VASP cooperate to control actin polymerization, enabling dendrite growth and branching.

Keywords:
Actin polymerizationDendrite branchingDendrite morphogenesisEna/VASPWAVE regulatory complex

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cell Biology

Background:

  • Dendrite morphogenesis is crucial for neuronal connectivity and function.
  • Understanding the molecular mechanisms of branched dendrite formation is incomplete.

Purpose of the Study:

  • Investigate the roles of actin regulatory proteins in dendrite outgrowth.
  • Elucidate the interaction between the WAVE Regulatory Complex (WRC) and UNC-34/Ena/VASP.

Main Methods:

  • In vivo time-lapse imaging of C. elegans PVD neurons in mutant strains.
  • Analysis of actin regulatory protein mutants (WRC, UNC-34).
  • In vivo localization studies of UNC-34 using GFP-tagged transgenes.

Main Results:

  • Identified a sequence of swelling and filopodia formation during dendrite outgrowth.
  • Mutations in UNC-34 disrupted filopodia formation, while WRC mutations abolished growth.
  • UNC-34 directly binds to WRC, and this interaction is essential for localization and dendrite outgrowth.

Conclusions:

  • Actin regulators like WRC and UNC-34/Ena/VASP cooperate in branched dendrite formation.
  • DMA-1 receptor recruits WRC for branched actin polymerization and swelling formation.
  • UNC-34/Ena/VASP mediates new branch initiation and extension from swellings.