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The Nucleolus

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 Nucleolus

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,...

Additional Subnuclear Structures

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...

Additional Subnuclear Structures

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...

The Nucleus

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 Nucleus

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...

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Related Experiment Video

Updated: Jul 9, 2026

A Versatile Pipeline for Analyzing Dynamic Changes in Nuclear Bodies in a Variety of Cell Types

A Versatile Pipeline for Analyzing Dynamic Changes in Nuclear Bodies in a Variety of Cell Types

Published on: June 28, 2024

Nucleolus: the fascinating nuclear body.

Valentina Sirri¹, Silvio Urcuqui-Inchima, Pascal Roussel

¹Nuclei and Cell Cycle, CNRS, Université Paris VI, Université Paris VII, Institut Jacques Monod, 2 place Jussieu, 75251, Paris Cedex 05, France.

Histochemistry and Cell Biology

|November 30, 2007

Summary

The nucleolus, a key nuclear structure, is vital for ribosome biogenesis and cellular stress sensing. Its dynamic functions and interactions with viruses and pathologies highlight its importance in cell biology.

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A Versatile Pipeline for Analyzing Dynamic Changes in Nuclear Bodies in a Variety of Cell Types

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Capturing Cytoskeleton-Based Agitation of the Mouse Oocyte Nucleus Across Spatial Scales

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Published on: January 12, 2024

Area of Science:

Cell Biology
Molecular Biology
Genetics

Background:

Nucleoli are prominent nuclear structures essential for ribosome biogenesis.
Ribosomal RNA synthesis and processing occur within the nucleolus, regulated by RNA polymerase I and the cell cycle.
The nucleolus is a dynamic compartment involved in nuclear organization and molecular exchange with the nucleoplasm.

Purpose of the Study:

To elucidate the multifaceted roles of the nucleolus in cellular functions.
To explore the nucleolus's involvement in ribosome biogenesis, cell cycle regulation, and stress response.
To understand the interactions between the nucleolus, viruses, and disease.

Main Methods:

Review of existing literature on nucleolar structure and function.
Analysis of nucleolar assembly post-mitosis and its cell cycle regulation.
Investigation of nucleolar sequestration capabilities and its role in stress sensing.

Main Results:

Nucleoli are central to ribosome biogenesis, with RNA polymerase I activity being cell cycle-dependent.
Nucleolar assembly is a regulated process occurring after mitosis.
The nucleolus acts as a sequestration domain and a sensor of cellular stress, with implications for viral replication and pathologies.

Conclusions:

The nucleolus is a multifunctional nuclear domain critical for ribosome production and cellular homeostasis.
Nucleolar disruption serves as a stress indicator, impacting ribosomal protein distribution.
The nucleolus's interactions with viruses and its link to pathologies underscore its significance in cell function and disease.