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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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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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Cytoskeletal Coordination in Cell Migration01:32

Cytoskeletal Coordination in Cell Migration

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A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker...
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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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Introduction to Actin01:26

Introduction to Actin

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Actin is a highly conserved cytoskeletal protein found abundantly in eukaryotic cells. It constitutes 10% weight of the total cellular protein in muscle cells, while in non-muscle cells, it is lower and makes up around 1–5 percent of the total cell protein. Actin found in the unicellular amoebae and complex multicellular animals is around 80% similar, demonstrating their conservation over a billion years of evolution.  Actin coding genes are conserved within species and across...
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Assembly of Complex Microtubule Structures01:32

Assembly of Complex Microtubule Structures

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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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Related Experiment Video

Updated: Oct 2, 2025

A Time-Efficient Fluorescence Spectroscopy-Based Assay for Evaluating Actin Polymerization Status in Rodent and Human Brain Tissues
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Control of Synapse Structure and Function by Actin and Its Regulators.

Juliana E Gentile1, Melissa G Carrizales2, Anthony J Koleske2,3

  • 1Stanley Center for Psychiatric Research, Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA.

Cells
|February 25, 2022
PubMed
Summary

Synaptic actin filaments are crucial for neuron communication and function. Disruptions in these actin regulators are linked to neurodevelopmental and psychiatric disorders, impacting neurotransmission.

Keywords:
actinelectron microscopyendocytosisneurotransmissionpostsynapticpresynapticsynapsevesicle recycling

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Area of Science:

  • Neuroscience
  • Cell Biology

Background:

  • Synapses are specialized junctions enabling neuronal communication.
  • Actin filaments and their regulators are essential for synaptic structure and function.

Purpose of the Study:

  • To review recent advances in understanding synaptic actin organization and regulation.
  • To highlight actin's role in key neuronal functions and its connection to disease.

Main Methods:

  • Review of microscopic techniques for studying synaptic actin.
  • Analysis of genetic data from neurodevelopmental and psychiatric disorders.

Main Results:

  • Synapses contain distinct actin pools with specific localizations and dynamics.
  • Actin regulates protein organization and ion channel endocytosis at synapses.
  • Genetic variants in actin regulators are associated with disease risk.

Conclusions:

  • Synaptic actin plays a critical role in neurotransmission.
  • Dysregulation of synaptic actin contributes to neurodevelopmental and psychiatric disorders.