title: One-step gene replacement in yeast by cotransformation.
abstract: A general method to replace chromosomal DNA sequences of Saccharomyces cerevisiae by any in vitro modified DNA sequence has been developed and was applied to the PHO5 locus on chromosome II. A recipient strain was constructed in which part of the chromosomal PHO5 sequence was substituted by the URA3 gene. Replacement of this pho5-URA3 substitution by pho5 mutant alleles was achieved in one step by cotransformation with a pho5 DNA fragment and the self-replicating plasmid YEp13, which contains the LEU2 gene as a selectable marker. Leu+ transformants were selected, and the replacement events at the PHO5 locus were detected by their Ura- phenotype (1-4% of the Leu+ were Ura-). In a similar way the PHO5 coding sequence was replaced by the sequence coding for human tissue-type plasminogen activator (t-PA).
mesh_terms: D000483:Alleles; D001482:Base Composition; D001483:Base Sequence; D004262:DNA Restriction Enzymes; D004271:DNA, Fungal / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics; D005800:Genes, Fungal; D010957:Plasmids; D012441:Saccharomyces cerevisiae / Q000235:genetics*; D014170:Transformation, Genetic
chemical_list: D004271:DNA, Fungal; D004262:DNA Restriction Enzymes