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Biotechnol Bioeng. 1996 Jan 5;49(1):45-51.

G418 Selection and stability of cloned genes integrated at chromosomal delta sequences of Saccharomyces cerevisiae.

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  • 1Department of Chemical and Biochemical Engineering, University of California, Irvine, CA 92717, USA.


The chromosomal delta sequences of the yeast Saccharomyces cerevisiae were employed as recombination sites to integrate the bacterial neo(r) gene and the yeast SUC2 gene into the yeast genome. A dominate selection method employing the aminoglycoside antibiotic G418 was used. Transformation efficiencies and growth behaviors of the transformants were studied. Transformants were obtained with more than 40 integrations; the majority of insertions were tandem with a maximum of three different insertion sites utilized at one time. After 70-100 generations of growth in nonselective medium, the high copy number SUC2-neo(r) integrants were found to be unstable; only minor instability was observed for the neo(r) and low copy number SUC2-neo(r) integrants.


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