Targeted deletions created in yeast vectors by recombinational excision

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Abstract
We have developed a simple method for creating defined deletions in yeast vectors by utilizing the ability of Saccharomyces cerevisiae to perform homologous recombination. Two complementary single-stranded oligonucleotides are designed so that the 5' and 3' halves of the resulting double-stranded oligonucleotide are homologous to the 5' and 3' side of a desired deletion junction, respectively. The sequence to be deleted is cleaved by restriction endonuclease digestion, followed by co-transformation of the linearized plasmid and the oligonucleotide into yeast. By homologous recombination in vivo, a subset of the plasmids will recircularize and simultaneously acquire the deletion as defined by the oligonucleotide.

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