Reference: Lee FW and Da Silva NA (1996) Application of Ty1 for cloned gene insertion: amplification of a large regulated expression cassette in Saccharomyces cerevisiae. Appl Microbiol Biotechnol 44(5):620-3

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Abstract


A large cassette, 4.6 x 10(3) bases (4.6 kb) in length, containing an inducible expression system (the yeast CUP1 promoter fused to the Escherichia coli lacZ structural gene) and a bacterial neomycin-resistance gene (neo) has been cloned into the noncoding region of a GAL1-regulated Ty1 retrotransposon. Galactose was used to induce retrotransposition in Saccharomyces cerevisiae, and cells containing integrations were selected by resistance to the aminoglycoside G418. Integrations of neo and CUP1p-lacZ were verified, and beta-galactosidase activity was confirmed. Analysis via Southern blots demonstrated integrations at various chromosomal locations, and the number of insertions obtained ranged from one to five after three rounds of induction. Therefore, the packaging limit of Ty1 virus-like particles for RNA is at least 10.3 kb and Ty1 can transpose foreign genes as large as 4.6 kb, demonstrating the practical application of Ty1 for the insertion of large regulated expression cassettes.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Lee FW, Da Silva NA
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