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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

Ribosomal RNA Synthesis

Ribosomal RNA Synthesis

Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...

Ribosomal RNA Synthesis

Ribosomal RNA Synthesis

Ribosomes

Ribosomes

Ribosomes translate genetic information encoded by messenger RNA (mRNA) into proteins. Both prokaryotic and eukaryotic cells have ribosomes. Cells that synthesize large quantities of protein—such as secretory cells in the human pancreas—can contain millions of ribosomes.
Ribosome Structure and Assembly
Ribosomes are composed of ribosomal RNA (rRNA) and proteins. In eukaryotes, rRNA is transcribed from genes in the nucleolus—a part of the nucleus that specializes in ribosome...

Translation

Translation

Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of...

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Related Experiment Video

Updated: Jan 21, 2026

Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses

Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses

Published on: February 25, 2011

The Nucleolus: A Multiphase Condensate Balancing Ribosome Synthesis and Translational Capacity in Health, Aging and

Carl C Correll¹, Jiri Bartek^2,3, Miroslav Dundr⁴

¹Center for Proteomics and Molecular Therapeutics, Rosalind Franklin University of Medicine & Science, North Chicago, IL 60064, USA. carl.correll@rosalindfranklin.edu.

|August 14, 2019

Summary

This summary is machine-generated.

The nucleolus orchestrates ribosome biogenesis, a critical energy-intensive process for cell growth. New insights reveal its phase separation-driven organization and link ribosome defects to aging and cancer.

Keywords:

genome instability links to diseases nucleolus phase separation pre-rRNA processing rDNA genes ribosomal genes ribosome biogenesis

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Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

The nucleolus, a key nuclear structure, is vital for ribosome biogenesis, essential for cellular protein synthesis, growth, and homeostasis.
Ribosome assembly is an energy-demanding, evolutionarily conserved process, yet its link to disease is a recent area of study.

Purpose of the Study:

To provide perspective on novel principles of nucleolar formation and organization.
To review current understanding of ribosome biogenesis, including structural analysis and quality control.
To discuss the impact of aging and genetic defects on ribosome genesis and associated diseases.

Main Methods:

Review of recent literature on nucleolar structure and function.
Analysis of advances in structural biology of ribosome formation.
Discussion of pathophysiological links between nucleolus, protein synthesis, aging, and disease.

Main Results:

Nucleolar formation is governed by principles of liquid-liquid phase separation, leading to multiphase organization.
Ribosome assembly involves a step-wise process with critical quality control mechanisms.
Aging and genetic defects (ribosomopathies) impair ribosome genesis, predisposing to complex diseases like cancer.

Conclusions:

Understanding nucleolar organization and ribosome biogenesis is crucial for comprehending cellular health and disease.
Dysregulation of ribosome genesis contributes to aging phenotypes and the development of ribosomopathies and cancer.