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Genetic selection for reciprocal translocation at chosen chromosomal sites in Saccharomyces cerevisiae.

ABSTRACT

We have constructed viable Saccharomyces cerevisiae strains containing a reciprocal translocation between the URA2 site of chromosome X and the HIS3 site of chromosome XV. Our methodology is an extension of the method originally developed to introduce an altered cloned sequence at the chromosomal location from which the parent sequence was derived (S. Scherer and R.W. Davis, Proc. Natl. Acad. Sci. U.S.A. 76:4951-4955, 1979). It comprises three essential steps. First, a nonreverting ura2- strain was constructed by deleting a 3.7-kilobase fragment from the coding sequence of the wild-type URA2 gene. Second, part of the coding sequence of the wild-type URA2 gene (without promotor) was inserted at the HIS3 locus of the ura2- strain. Third, after several generations of growth on uracil-supplemented medium, ura2+ colonies were selected which resulted from mitotic recombination between the nonoverlapping deletions of URA2 located on chromosomes X and XV.

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