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Related Concept Videos

The Nucleolus02:55

The Nucleolus

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The nucleolus is the most prominent substructure of the nucleus. When it was first discovered, it was considered to be an isolated organelle that forms fibrils and granules. In 1931, the relationship between the nucleolus and chromosomes was first described by Heitz. He observed that the appearance and size of nucleolus varies depending on the stage of the cell cycle. He also noticed constricted regions on different chromosomes clustered together at definite cell cycle stages. These regions,...
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The Nucleus01:25

The Nucleus

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The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
Arrangement of DNA within Nucleus
The regulation of gene expression inside the nucleus is dependent on many factors, including the DNA structure. The...
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Additional Subnuclear Structures02:10

Additional Subnuclear Structures

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The eukaryotic nucleus is a double membrane-bound organelle that contains nearly all of the cell’s genetic material in the form of chromosomes. It is rightly called the “brain” of the cell as it shoulders the responsibility of responding to various physiological processes, stress, altered metabolic conditions, and other cellular signals. 
The nucleus contains many membrane-less subnuclear organelles or nuclear bodies, such as nucleoli, Cajal bodies, speckles,...
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Nucleoid01:24

Nucleoid

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The nucleoid represents a structurally and functionally distinct region within prokaryotic cells, where the cell's DNA and associated proteins are housed. Unlike eukaryotic cells, prokaryotes lack a membrane-bound nucleus, and the nucleoid facilitates the organization and accessibility of the genetic material within this constraint. The DNA in most bacteria and archaea exists as a single, circular, double-stranded molecule that is highly compacted through supercoiling and interactions with...
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Nuclear Protein Sorting01:34

Nuclear Protein Sorting

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Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
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Nuclear Localization Signals and Import01:46

Nuclear Localization Signals and Import

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Proteins targeted to the nucleus carry short stretches of amino acid sequences called the nuclear localization signal or NLS. Classical nuclear localization signals are of two types: monopartite and bipartite NLS. Monopartite classical NLS (cNLS) consists of a single cluster of 4-8 amino acids. Bipartite cNLS consists of two clusters of  2-3 amino acids and a 9-12 residue long proline-rich linker bridging the two clusters. Signal clusters are rich in positively charged amino acids such as...
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Related Experiment Video

Updated: Aug 3, 2025

Author Spotlight: Elucidating the Dynamics of Mechano-Transduction and Nuclear Agitation in Mouse Oocytes
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Author Spotlight: Elucidating the Dynamics of Mechano-Transduction and Nuclear Agitation in Mouse Oocytes

Published on: January 12, 2024

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Nucleolar structure connects with global nuclear organization.

Chen Wang1, Hanhui Ma2,3, Susan J Baserga4,5,6

  • 1Department of Cell and Developmental Biology, Northwestern University Feinberg School of Medicine, Chicago, IL.

Biorxiv : the Preprint Server for Biology
|April 10, 2023
PubMed
Summary
This summary is machine-generated.

Nucleolar structure, not ribosome synthesis, is crucial for organizing nuclear components. Disrupting RNA polymerase I subunit RPA194 causes widespread nuclear reorganization, highlighting the nucleolus’s role in maintaining nuclear architecture.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genomics

Background:

  • The nucleolus is a vital nuclear body with diverse functions.
  • Understanding the specific roles of nucleolar structure is challenging without multi-action drugs.

Approach:

  • RNA polymerase I subunit RPA194 was depleted using siRNA in HeLa cells.
  • The effects on nucleolar structure and other nuclear components were analyzed.
  • A control knockdown of UTP4 (pre-ribosomal RNA processing factor) was performed to differentiate structural vs. synthesis effects.

Key Points:

  • RPA194 knockdown led to nucleolar segregation and disrupted the perinucleolar compartment.
  • Centromere-nucleolus interactions decreased, and genomic loci positions changed.
  • Cajal bodies showed morphological and compositional alterations.
  • UTP4 knockdown did not cause nucleolar segregation or similar intranuclear effects, decoupling these changes from ribosome synthesis inhibition.

Conclusions:

  • Nucleolar structural integrity is essential for the spatial organization of nuclear components.
  • A system exists linking nucleolar structure to the maintenance of nuclear bodies and genomic loci positioning.
  • These findings emphasize the structural role of the nucleolus beyond ribosome biogenesis.