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Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
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The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
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Controlled nuclear fission reactions are used to generate electricity. Any nuclear reactor that produces power via the fission of uranium or plutonium by bombardment with neutrons has six components: nuclear fuel consisting of fissionable material, a nuclear moderator, a neutron source, control rods, reactor coolant, and a shield and containment system.
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Updated: Feb 4, 2026

Study of the Actin Cytoskeleton in Live Endothelial Cells Expressing GFP-Actin
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Multiple Pools of Nuclear Actin.

Dylane M Wineland1, Daniel J Kelpsch1, Tina L Tootle1

  • 1Anatomy and Cell Biology, University of Iowa Carver College of Medicine, Iowa City, Iowa.

Anatomical Record (Hoboken, N.J. : 2007)
|October 13, 2018
PubMed
Summary
This summary is machine-generated.

Nuclear actin is highly prevalent in vivo, with distinct pools identified using different reagents during Drosophila oogenesis. These findings suggest nuclear actin

Keywords:
Drosophilanuclear actinnucleolusoocyteoogenesis

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Developmental Biology

Background:

  • Nuclear actin's in vivo prevalence and structure remain largely unknown despite early reports.
  • Characterizing nuclear actin is crucial for understanding its diverse cellular roles.

Purpose of the Study:

  • To characterize the prevalence, structure, and localization of nuclear actin in vivo.
  • To investigate distinct pools of nuclear actin using specific labeling reagents.
  • To explore potential functions of nuclear actin in Drosophila oogenesis.

Main Methods:

  • Utilized Drosophila oogenesis as a model system for follicle development.
  • Employed three distinct reagents (DNase I, anti-actin C4, anti-actin AC15) to label nuclear actin.
  • Performed colocalization studies to determine the distribution of different actin pools within the nucleus.

Main Results:

  • Identified distinct pools of nuclear actin recognized by DNase I (G-actin), C4, and AC15 antibodies.
  • Demonstrated widespread G-actin presence in the nucleus across all follicle development stages.
  • Observed specific localization patterns for C4 and AC15 nuclear actin, including nucleolar, nucleoplasmic, and chromatin association, with dynamic changes in the oocyte.

Conclusions:

  • Nuclear actin is highly prevalent in vivo, existing in multiple distinct pools.
  • Different reagents recognize specific actin populations, revealing diverse nuclear localizations.
  • Nuclear actin may play roles in stemness, nucleolar function, transcription, and nuclear structure, warranting further investigation.