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Related Concept Videos

The Nucleolus02:55

The Nucleolus

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,...
The Nucleolus02:55

The Nucleolus

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,...
Stringent Response in E. coli01:23

Stringent Response in E. coli

Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
The Nucleus01:32

The Nucleus

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...
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.
Arrangement of DNA within Nucleus
The regulation of gene expression inside the nucleus is dependent on many factors, including the DNA structure. The...
Additional Subnuclear Structures02:10

Additional Subnuclear Structures

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, paraspeckles, etc. These nuclear...

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Methods to Classify Cytoplasmic Foci as Mammalian Stress Granules
09:33

Methods to Classify Cytoplasmic Foci as Mammalian Stress Granules

Published on: May 12, 2017

The nucleolus under stress.

Séverine Boulon1, Belinda J Westman, Saskia Hutten

  • 1Wellcome Trust Centre for Gene Regulation and Expression, University of Dundee, Dundee DD1 5EH, UK.

Molecular Cell
|October 23, 2010
PubMed
Summary
This summary is machine-generated.

Cells respond to stress by altering metabolism and nuclear organization. This review details how the nucleolus and Cajal bodies (CBs) coordinate cellular stress responses, focusing on p53 regulation and structural changes.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Stress Response

Background:

  • Cells exhibit rapid metabolic and nuclear architecture adjustments in response to stress.
  • Mammalian cells typically undergo cell-cycle arrest or apoptosis under stress.
  • Nuclear reorganization involves inhibiting major pathways while activating stress responses like DNA repair.

Purpose of the Study:

  • To review the roles of the nucleolus and Cajal bodies (CBs) in cellular stress responses.
  • To elucidate how the nucleolus acts as a stress sensor and coordinates cellular defense mechanisms.
  • To examine the impact of stress on nucleolar morphology, composition, and p53 regulation.

Main Methods:

  • Literature review focusing on cellular stress responses.
  • Analysis of nucleolar and Cajal body functions under stress conditions.
  • Review of studies on p53 regulation and stress-induced changes in nuclear organelles.

Main Results:

  • The nucleolus is a key sensor and coordinator of cellular stress responses.
  • Stress induces significant alterations in nucleolar morphology and composition.
  • The nucleolus plays a role in the stress-induced regulation of p53.
  • Crosstalk between nucleoli and Cajal bodies is integral to stress management.

Conclusions:

  • The nucleolus and Cajal bodies are critical nuclear organelles involved in sensing and responding to cellular stress.
  • Understanding these responses provides insights into cell fate decisions and disease mechanisms.
  • Further research into nucleolar-Cajal body interactions can reveal novel therapeutic targets for stress-related disorders.