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Related Concept Videos

Assembly of Cytoskeletal Filaments01:18

Assembly of Cytoskeletal Filaments

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Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
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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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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.
The high-order actin...
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Spindle Assembly02:50

Spindle Assembly

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Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a...
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Protein Complex Assembly02:41

Protein Complex Assembly

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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
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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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Related Experiment Video

Updated: Mar 9, 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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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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Cell assemblies at multiple time scales with arbitrary lag constellations.

Eleonora Russo1, Daniel Durstewitz1

  • 1Department of Theoretical Neuroscience, Bernstein Center for Computational Neuroscience, Central Institute for Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.

Elife
|January 12, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces a new framework to identify neural cell assemblies, overcoming computational limits. Findings reveal that neural coding schemes vary across brain regions and tasks, challenging universal models.

Keywords:
cell assembliescomputational biologymultiple single-unit recordingsneural codingneuroscienceneurostatisticsratsystems biology

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Systems Neuroscience

Background:

  • Hebb's cell assembly theory is a dominant concept in neuroscience for understanding neural information processing.
  • Existing methods lack statistical tools to detect assemblies with varied time lags and temporal scales, hindering progress.
  • Computational burden limits the analysis of complex neural assembly structures.

Purpose of the Study:

  • To present a unifying methodological and conceptual framework for detecting neural assembly structure.
  • To enable the identification of assemblies at multiple temporal scales, precision levels, and with arbitrary internal organization.
  • To investigate the variability of cortical coding schemes across different brain areas and task demands.

Main Methods:

  • Developed a novel statistical framework to detect neural assembly structure.
  • Applied the methodology to analyze multiple single-unit recordings from various cortical areas.
  • Focused on identifying assemblies with arbitrary time lags and across multiple temporal scales.

Main Results:

  • The new framework successfully detects assembly structure at various time scales and precision levels.
  • Analysis revealed no universal cortical coding scheme.
  • Assembly structure and precision were found to be significantly dependent on the specific brain area and ongoing task demands.

Conclusions:

  • The developed framework provides a powerful tool for analyzing neural assemblies with unprecedented flexibility.
  • Cortical information processing is not governed by a single universal coding scheme.
  • Neural coding is dynamic and context-dependent, varying by brain region and behavioral tasks.