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, 207 (3), 527-41

Double-strand Breaks Stimulate Alternative Mechanisms of Recombination Repair

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Double-strand Breaks Stimulate Alternative Mechanisms of Recombination Repair

J A Nickoloff et al. J Mol Biol.

Abstract

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.

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