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- W2050829890 abstract "Plasmid pBR322 carrying the yeast LEU2+ gene transforms leu− yeast into LEU+ at a low frequency by integration at homologous chromosomal DNA. When one-half of the yeast rDNA repeat unit (BglII-A) is inserted into the plasmid, the frequency of yeast transformation increases 100- to 200-fold, in proportion to the increased amount of homologous repetitive rDNA available for integration. When the other half of the repeat unit (BglII-B) is inserted into the plasmid, the transformation frequency increases by a factor of 104, and the transformants are very unstable. It is likely that this fragment of rDNA contains a yeast origin of replication. This plasmid is a useful vector for cloning fragments of yeast DNA in yeast. We have used the LEU2+ gene, inserted into the rDNA locus, as a genetic marker for mapping the rDNA, in a procedure analogous to the use of antibiotic resistance transposons in the mapping of bacterial genes. Yeast ribosomal DNA is on chromosome XII between asp5 and ura4 as determined by mitotic linkage. Genetic analysis of markers inserted at the rDNA locus should be a useful tool for studying the conservation of sequence homology and the conservation of copy number of repeated genes." @default.
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- W2050829890 title "Insertion of a genetic marker into the ribosomal DNA of yeast" @default.
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- W2050829890 doi "https://doi.org/10.1016/0147-619x(79)90053-2" @default.
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