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. 1994 Feb;14(2):1278–1292. doi: 10.1128/mcb.14.2.1278

Homologous, homeologous, and illegitimate repair of double-strand breaks during transformation of a wild-type strain and a rad52 mutant strain of Saccharomyces cerevisiae.

C Mezard 1, A Nicolas 1
PMCID: PMC358483  PMID: 8289807

Abstract

Different modes of in vivo repair of double-strand breaks (DSBs) have been described for various organisms: the recombinational DSB repair (DSBR) mode, the single-strand annealing (SSA) mode, and end-to-end joining. To investigate these modes of DSB repair in Saccharomyces cerevisiae, we have examined the fate of in vitro linearized replicative plasmids during transformation with respect to several parameters. We found that (i) the efficiencies of both intramolecular and intermolecular linear plasmid DSB repair are homology dependent (according to the amount of DNA used during transformation [100 ng or less], recombination between similar but not identical [homeologous] P450s sequences sharing 73% identity is 2- to 18-fold lower than recombination between identical sequences); (ii) the RAD52 gene product is not essential for intramolecular recombination between homologous and homeologous direct repeats (as in the wild-type strain, recombination occurs with respect to the overall alignment of the parental sequences); (iii) in contrast, the RAD52 gene product is required for intermolecular interactions (the rare transformants which are obtained contain plasmids resulting from deletion-forming intramolecular events involving little or no sequence homology); (iv) similarly, sequencing data revealed examples of intramolecular joining within the few terminal nucleotides of the transforming DNA upon transformation with a linear plasmid with no repeat in the wild-type strain. The recombinant junctions of the rare illegitimate events obtained with S. cerevisiae are very similar to those observed in the repair of DSB in mammalian cells. Together, these and previous results suggest the existence of alternative modes for DSB repair during transformation which differ in their efficiencies and in the structure of their products. We discuss the implications of these results with respect to the existence of alternative pathways and the role of the RAD52 gene product.

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Selected References

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