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Related Concept Videos

Generation of Straight or Branched Actin Filaments01:14

Generation of Straight or Branched Actin Filaments

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...
Integration of Synaptic Events01:28

Integration of Synaptic Events

Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
Formation of Higher-order Actin Filaments01:11

Formation of Higher-order Actin Filaments

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 networks...
The Neuromuscular Junction01:19

The Neuromuscular Junction

The nervous system consists of complex motor neuron circuits, including upper motor neurons originating from the cerebral cortex and lower motor neurons starting in the spinal cord, coordinating both voluntary and involuntary movements. Among these, somatic motor neurons activate skeletal muscles and are classified into alpha, beta, and gamma types. Alpha neurons are vital for voluntary movement coordination, while gamma neurons adjust muscle spindle sensitivity, and the function of beta...
Introduction to Actin01:26

Introduction to Actin

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 different species.
Synaptic Signaling01:09

Synaptic Signaling

Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
Most synapses are chemical, meaning an electrical impulse or action potential spurs the release of chemical messengers called neurotransmitters. The neuron sending the signal is called the presynaptic neuron, and the neuron receiving the signal is the postsynaptic neuron.
The presynaptic neuron fires an action potential that...

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Related Experiment Video

Updated: May 14, 2026

3D Modeling of Dendritic Spines with Synaptic Plasticity
07:13

3D Modeling of Dendritic Spines with Synaptic Plasticity

Published on: May 18, 2020

Synaptic spine head morphodynamics from graph grammar rules for actin dynamics.

Matthew Hur1, Thomas M Bartol2, Padmini Rangamani3

  • 1Program in Mathematical, Computational, and Systems Biology, University of California, Irvine, Irvine, 92697, CA, USA.

Biorxiv : the Preprint Server for Biology
|May 13, 2026
PubMed
Summary
This summary is machine-generated.

Synaptic learning involves changes in dendritic spine size, influenced by actin cytoskeleton dynamics. Dynamical Graph Grammars model these processes, revealing how proteins affect spine morphology.

Keywords:
actinbiophysicsepistasisgraph grammarmembranesimulationspine head

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A Time-Efficient Fluorescence Spectroscopy-Based Assay for Evaluating Actin Polymerization Status in Rodent and Human Brain Tissues
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Analysis of Dendritic Spine Morphology in Cultured CNS Neurons
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Analysis of Dendritic Spine Morphology in Cultured CNS Neurons

Published on: July 13, 2011

Related Experiment Videos

Last Updated: May 14, 2026

3D Modeling of Dendritic Spines with Synaptic Plasticity
07:13

3D Modeling of Dendritic Spines with Synaptic Plasticity

Published on: May 18, 2020

A Time-Efficient Fluorescence Spectroscopy-Based Assay for Evaluating Actin Polymerization Status in Rodent and Human Brain Tissues
06:54

A Time-Efficient Fluorescence Spectroscopy-Based Assay for Evaluating Actin Polymerization Status in Rodent and Human Brain Tissues

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Analysis of Dendritic Spine Morphology in Cultured CNS Neurons
11:48

Analysis of Dendritic Spine Morphology in Cultured CNS Neurons

Published on: July 13, 2011

Area of Science:

  • Computational neuroscience
  • Biophysics
  • Cell biology

Background:

  • Synaptic plasticity, crucial for learning and memory, is linked to structural changes in dendritic spines.
  • The actin cytoskeleton and cell membrane dynamics govern spine head morphology and function.

Purpose of the Study:

  • To develop a computational framework for modeling dendritic spine morphodynamics.
  • To investigate the influence of actin-binding proteins on spine morphology using a biophysical model.

Main Methods:

  • Utilized Dynamical Graph Grammars (DGGs) to model 2D networks of actin filaments and membrane.
  • Encoded biophysical and biochemical models within DGG rule sets, ensuring invariance and conservation laws.
  • Simulated dissipative stochastic dynamics based on graph-local energy functions.

Main Results:

  • The DGG framework successfully modeled spine head morphology, integrating cytoskeleton and membrane dynamics.
  • Simulations delineated the effects of four specific actin-binding proteins on spine shape.
  • Identified epistatic relationships between these proteins influencing morphological outcomes.

Conclusions:

  • Dynamical Graph Grammars provide a flexible and extensible platform for simulating complex cellular processes like spine morphodynamics.
  • The model offers insights into the molecular mechanisms underlying synaptic plasticity by predicting protein-protein interactions affecting neuronal structure.