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A system of biological containment for recombinant DNA experiments in Saccharomyces cerevisiae (Brewer's/Baker's yeast) is described. The principle of containment is sterility: the haploid host strains all contain a mating-type-non-specific sterile mutation. The hosts also contain four auxotrophic mutations suitable for selection for the various kinds of(More)
We have determined the nucleotide sequence of the yeast ILV2 gene which codes for the amino acid biosynthetic enzyme acetolactate synthase (ALS). ALS has recently been shown to be the target in bacteria, yeast and plants, of the potent new herbicide sulfometuron methyl. The coding sequence for the ILV2 polypeptide contains 2061 base pairs. Comparison of(More)
We have observed genetic recombination between ura3( -) mutations (among them extensive deletions) carried on "episomal" (i.e., 2micro DNA-containing) plasmids and other ura3( -) alleles present at the normal chromosomal URA3 locus. The recombination frequency found was comparable to the level observed for classical mitotic recombination but was relatively(More)
We obtained strains of yeast with large segments of 2 mu plasmid DNA integrated at several chromosomal locations by selecting genetically for recombination between a chromosomal sequence carried on a 2 mu-circle-containing hybrid plasmid and a homologous sequence on the chromosome. In all diploids examined, the presence of 2 mu circle sequences causes a(More)
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