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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

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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.
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Before a cell can divide, it must accurately replicate all of its chromosomes, including the DNA and its associated histone and non-histone proteins.  This process begins at numerous origins of replication during the S phase of the cell cycle in each of a cell’s chromosomes simultaneously. Certain nucleotides can act as origins of replication, but these sequences are not well defined - especially in complex, multi-cellular, eukaryotic species. The length of DNA that spans an origin...
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Additional Subnuclear Structures02:10

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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. 
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Chromatin Position Affects Gene Expression02:35

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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
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Chromosome Structure

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A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
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Preparation of Cytoplasmic and Nuclear Long RNAs from Primary and Cultured Cells
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Nucleolar origins: challenging perspectives on evolution and function.

Israel Muñoz-Velasco1, Ana Karen Herrera-Escamilla1, Alberto Vázquez-Salazar2

  • 1Departamento de Biología Celular, Universidad Nacional Autónoma de México, Ciudad de México, México.

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|March 11, 2025
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Summary

The nucleolus, a key cellular structure, is vital for cell life, stress response, and aging. Its ancient functions, found even in prokaryotes, are crucial for health and disease, offering new therapeutic targets.

Keywords:
nucleolar organizationnucleolusnucleolus evolutionnucleolus-like structures

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Area of Science:

  • Cell Biology
  • Evolutionary Biology
  • Molecular Genetics

Background:

  • The nucleolus, traditionally viewed as a ribosome factory, is now understood as a central cellular regulator.
  • Recent findings indicate nucleolus-like structures in prokaryotes, suggesting ancient origins for its functions.
  • The nucleolus influences diverse cellular processes including genome organization, stress response, and aging.

Purpose of the Study:

  • To review the evolutionary history of the nucleolus from early life to modern organisms.
  • To examine the structural and functional diversity of the nucleolus across different domains of life.
  • To highlight the nucleolus's role in health and disease and its potential as a therapeutic target.

Main Methods:

  • Literature review and synthesis of current research on nucleolar biology and evolution.
  • Analysis of key nucleolar proteins and their functions beyond ribosome biogenesis.
  • Integration of findings from advanced imaging and molecular techniques.

Main Results:

  • The nucleolus has ancient origins, with homologous functions present in prokaryotes.
  • Key nucleolar proteins regulate critical cellular processes such as cell cycle, DNA repair, and stress response.
  • Nucleolar dysfunction is linked to various diseases including cancer, ribosomopathies, and neurodegenerative disorders.

Conclusions:

  • The nucleolus is a dynamic and ancient organelle with diverse roles essential for cellular life.
  • Understanding the nucleolus's evolution and function provides insights into cellular complexity and disease mechanisms.
  • The nucleolus represents a promising target for novel therapeutic interventions in human diseases.