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Related Experiment Videos

Bi-directional replication and random termination.

D Santamaría¹, E Viguera, M L Martínez-Robles

¹Departamento de Biología Celular y del Desarrollo, CIB (CSIC), Velázquez 144, 28006 Madrid, Spain.

Nucleic Acids Research

|April 25, 2000

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DNA replication termination differs across organisms. In yeast, bidirectional replication forks show random termination, unlike the specific termination seen in E. coli and Xenopus egg extracts.

Area of Science:

Molecular Biology
Genetics
Biochemistry

Background:

DNA replication termination is crucial for genome stability.
Understanding termination mechanisms in different organisms provides insights into DNA replication fidelity.

Purpose of the Study:

To investigate and compare DNA replication termination mechanisms.
To analyze termination events in prokaryotic (E. coli), eukaryotic (Xenopus egg extracts), and yeast (Saccharomyces cerevisiae) systems using a shuttle vector.

Main Methods:

Two-dimensional (2D) agarose gel electrophoresis was employed to analyze replication intermediates.
Replication termination was studied in a YRp7 shuttle vector replicated in E. coli, Xenopus egg extracts, and S. cerevisiae.

Main Results:

Related Experiment Videos

E. coli exhibited uni-directional replication with termination at the ColE1 origin.
Xenopus egg extracts showed random initiation and termination patterns.
S. cerevisiae displayed bi-directional replication from ARS1, but termination occurred randomly along a plasmid hemisphere, not at a specific site, even after DNA sequence modifications. Similar random termination was observed with the ARS305 origin.

Conclusions:

Replication termination mechanisms vary significantly between E. coli, Xenopus, and S. cerevisiae.
Random termination in S. cerevisiae may result from asynchronous fork departure and differential fork progression rates from bi-directional origins.
The proposed mechanism for random termination in yeast could be applicable to other bi-directional replication origins.