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Related Concept Videos

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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The Role of Actin and Myosin in Non-muscle Cells01:10

The Role of Actin and Myosin in Non-muscle Cells

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Actin and myosin or actomyosin filaments also play a significant role in cells other than those involved in muscle contraction (which occurs within the sarcomere of muscle cells). The mechanism of non-muscle cell contractile bundles was first observed in Dictyostelium and Acanthamoeba. In non-muscle cells, two bundles are commonly found: stress fibers and actomyosin adherence belts. These contractile bundles are smaller and less organized than the ones found in muscle cells. They  are held...
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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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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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Adaptability of Cytoskeletal Filaments01:12

Adaptability of Cytoskeletal Filaments

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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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Polarity of the Cytoskeleton01:18

Polarity of the Cytoskeleton

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The intrinsic polarity of cells can be primarily attributed to two factors- i) the asymmetric accumulation of mobile components such are regulatory molecules and subcellular components across the cell and ii) the orientation of polar cytoskeletal filaments that make up the cytoskeletal networks, specifically microfilaments, and microtubules arranged along the axis of polarity. Interactions between the cytoskeletal filaments are crucial for the establishment and maintenance of the polar nature...
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Related Experiment Video

Updated: Nov 24, 2025

Aip1p Dynamics Are Altered by the R256H Mutation in Actin
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Aip1p Dynamics Are Altered by the R256H Mutation in Actin

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A dynamic actin-dependent nucleoskeleton and cell identity.

Tomas Venit1, Nadine Hosny El Said1, Syed Raza Mahmood1,2

  • 1Science Division, Biology Program, New York University Abu Dhabi (NYUAD), PO Box 129188, Abu Dhabi United Arab Emirates.

Journal of Biochemistry
|December 22, 2020
PubMed
Summary

Nuclear actin regulates chromatin structure and gene expression through phase separation. A novel mitochondrial actin pool, or

Keywords:
chromatin and transcription regulationdevelopment and differentiationgenome organization and integritymitochondrianuclear actin

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Related Experiment Videos

Last Updated: Nov 24, 2025

Aip1p Dynamics Are Altered by the R256H Mutation in Actin
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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genomics

Background:

  • Actin is a key regulator of eukaryotic cellular functions, including nuclear processes.
  • Nuclear actin influences chromatin remodeling, transcription, and RNA processing.
  • Actin dynamics are crucial for the dynamic nature of the nucleoskeleton and genome organization.

Purpose of the Study:

  • To review the role of nuclear actin in regulating chromatin structure and genome architecture.
  • To explore how actin-mediated phase separation contributes to gene expression during cell differentiation.
  • To discuss the implications of actin dysregulation in mitochondrial gene expression and nucleus-mitochondria communication.

Main Methods:

  • Review of existing literature on nuclear actin functions.
  • Analysis of studies on actin's role in chromatin remodeling and phase separation.
  • Examination of research on mitochondrial actin and its impact on mtDNA organization.

Main Results:

  • Nuclear actin regulates chromatin structure via phase separation, influencing genome architecture during differentiation.
  • Actin dynamics are critical for facilitating specific gene programs, including mitochondrial genes.
  • A novel mitochondrial actin pool ('mitoskeleton') organizes mitochondrial DNA (mtDNA).

Conclusions:

  • Nuclear actin plays a significant role in genome architecture and gene expression regulation.
  • Distinct actin pools (nuclear and mitochondrial) may mediate communication between the nucleus and mitochondria.
  • Actin's function extends beyond the cytoplasm to regulate nuclear and mitochondrial genome organization.