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The structural basis of nuclear function

D A Jackson¹, P R Cook

¹CRC Nuclear Structure and Function Research Group, Sir William Dunn School of Pathology, University of Oxford, United Kingdom.

International Review of Cytology

|January 1, 1995

Summary

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DNA replication and transcription may involve a sliding template mechanism, not just tracking polymerases. This suggests nuclear structure influences gene expression and DNA duplication timing.

Area of Science:

Molecular Biology
Cell Biology
Genetics

Background:

Current models propose polymerases move along DNA templates for transcription and replication.
The precise mechanisms governing DNA processing within the eukaryotic nucleus remain under investigation.

Purpose of the Study:

To review experimental evidence suggesting an alternative model for DNA transcription and replication.
To explore the role of nuclear architecture in regulating these fundamental DNA processes.

Main Methods:

Review of existing experimental data and literature.
Analysis of proposed models for polymerase-template interactions.
Examination of the functional implications of nuclear structures like 'factories'.

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Main Results:

Experimental findings support a model where the DNA template slides past a stationary polymerase.
This sliding mechanism is proposed to occur within large nuclear structures ('factories') anchored to the nucleoskeleton.
This challenges the conventional view of polymerase movement along DNA.

Conclusions:

The higher-order structure of the eukaryotic nucleus may dictate the timing and manner of DNA replication and transcription.
A template-sliding model offers a new perspective on the physical basis of gene expression and DNA duplication.