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Related Experiment Videos

Ends-in vs. ends-out recombination in yeast

P J Hastings1, C McGill, B Shafer

  • 1Department of Genetics, University of Alberta, Edmonton, Canada.

Genetics
|December 1, 1993
PubMed
Summary

Yeast chromosome integration of linearized plasmids shows efficient recombination for both ends-in and ends-out configurations. A slight bias favors ends-in events, suggesting limited cooperativity in double-strand break repair.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Yeast as a model organism

Background:

  • Double-strand break-induced recombination is crucial for DNA repair and genome stability.
  • Linearized plasmid integration into yeast chromosomes serves as a model for studying recombination mechanisms.

Purpose of the Study:

  • To compare the efficiency of two distinct plasmid integration configurations: ends-in and ends-out.
  • To investigate the role of cooperativity between DNA ends in plasmid integration and double-strand break repair.

Main Methods:

  • Utilized a yeast strain with both ends-in and ends-out integration targets.
  • Compared the recovery rates of linearized plasmid integration events for both configurations using the same cut plasmid.

Main Results:

  • Ends-in integration events were recovered two- to threefold more frequently than ends-out events.
  • The observed bias was not extreme, indicating limited cooperativity between the two ends of the linearized plasmid.

Conclusions:

  • The integration efficiency of linearized plasmids in yeast is comparable for ends-in and ends-out configurations.
  • Limited cooperativity between DNA ends suggests it may not be a major factor in the efficient integration of cut circular plasmids or chromosomal double-strand break repair.

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