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Related Concept Videos

Cytoskeletal Coordination in Cell Migration01:32

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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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The cytoskeleton is a complex dynamic structure performing varied functions based on cellular requirements. The adaptability of the individual filaments in the cytoskeleton determines their ability to perform various functions within the cell. It can undergo rapid reorganization during processes like cell division or remain stable for several hours as in the interphase. The adaptability of these filaments depends on stringent regulatory mechanisms. The microfilament and microtubules of the...
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Overview of the Cytoskeleton
The cytoskeleton is a network of protein filaments present within the cell, having three distinct filaments ̶   microfilaments, microtubules, and intermediate filaments. Each has characteristic features that distinguish them, including the dynamics of their assembly and disassembly, mechanical properties, polarity, and the type of molecular motors associated with them. Earlier, they were thought to be present only in eukaryotic cells; however, their...
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The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...
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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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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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Updated: Jun 17, 2025

The Mechanics of Poro-Elastic Contractile Actomyosin Networks As a Model System of the Cell Cytoskeleton
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Length control emerges from cytoskeletal network geometry.

Shane G McInally1, Alexander J B Reading2, Aldric Rosario3

  • 1Department of Biology and Biotechnology, Worcester Polytechnic Institute, Worcester, MA 01609.

Proceedings of the National Academy of Sciences of the United States of America
|August 6, 2024
PubMed
Summary
This summary is machine-generated.

Yeast cells control actin cable length through filament organization, not feedback. This emergent property allows cables to scale with cell size by tuning formin activity.

Keywords:
biological scalingcytoskeletonemergencesize control

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Area of Science:

  • Cell biology
  • Biophysics
  • Cytoskeletal dynamics

Background:

  • Cytoskeletal networks, like actin cables, are crucial for cell function.
  • Existing models focus on filament turnover for length control.

Purpose of the Study:

  • Propose a feedback-independent mechanism for yeast actin cable length control.
  • Investigate how actin cable length scales with cell size.

Main Methods:

  • Quantitative cell imaging
  • Mathematical modeling

Main Results:

  • Actin cable length control is an emergent property of cross-linked and bundled filaments.
  • Cell length-dependent formin activity scales cable length with cell size.

Conclusions:

  • A novel paradigm for cytoskeletal higher-order structure control.
  • Understanding emergent properties in biological self-organization.