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J Mol Biol. 1989 Jun 5;207(3):527-41.

Double-strand breaks stimulate alternative mechanisms of recombination repair.

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Department of Molecular Biology, Scripps Clinic and Research Foundation, La Jolla, CA 92037.


To test the double-strand break repair model, we used HO nuclease to introduce double-strand breaks at several sites along a yeast chromosome containing duplicated DNA. Depending on the configuration of the double-strand break and recombining markers, different spectra of recombinant products were observed. Different repair kinetics and recombinant products were observed when a double-strand break was introduced in unique or duplicated DNA. The results of this study suggest that double-strand breaks in yeast stimulate recombination by several mechanisms, and we propose an alternative mechanism for double-strand break-induced gene conversion that does not depend on direct participation of the broken ends.

[Indexed for MEDLINE]

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