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Cajal bodies: the first 100 years.

¹Department of Embryology, Carnegie Institution, Baltimore, Maryland 21210, USA. gall@ciwemb.edu.

Annual Review of Cell and Developmental Biology

|October 14, 2000

Summary

Cajal bodies are nuclear organelles involved in RNA processing. These structures may serve as sites for the preassembly of transcriptosomes, similar to how nucleoli preassemble ribosomes.

Area of Science:

Cell Biology
Molecular Biology
Genetics

Background:

Cajal bodies are nuclear organelles discovered nearly a century ago in vertebrate neural tissues.
They are found across diverse animal and plant species, indicating fundamental cellular roles.
Cajal bodies contain p80-coilin and factors for nuclear RNA transcription and processing.

Purpose of the Study:

To investigate the function of Cajal bodies in cellular processes.
To explore the role of Cajal bodies in RNA metabolism.
To propose a model for Cajal body function in relation to RNA processing.

Main Methods:

Literature review and synthesis of existing research on Cajal bodies.
Analysis of the molecular components within Cajal bodies, including RNA polymerases and processing factors.

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Development of a theoretical model based on observed cellular functions.

Main Results:

Cajal bodies contain all three eukaryotic RNA polymerases (involved in mRNA, rRNA, and pol III transcript synthesis).
They house factors essential for the transcription and processing of these nuclear RNAs.
A model is proposed where Cajal bodies act as sites for transcriptosome preassembly.

Conclusions:

Cajal bodies are crucial sites for the preassembly of transcriptosomes, which are involved in RNA transcription and processing.
This function parallels the role of the nucleolus in ribosome preassembly for protein translation.
Cajal bodies are integral to fundamental RNA metabolic pathways in eukaryotic cells.