Abstract
The efficiency of genetic transformation of Saccharomyces cerevisiae spheroplasts has been increased 10- to 100-fold over previously published procedures. Optimal transformation frequencies for single-stranded and double-stranded replicating plasmids are 2 × 10 7 and 5 × 10 6 transformants/μg, respectively. At saturating DNA concentrations, 12 and 3%, respectively, of the viable spheroplasts contain plasmid DNA. The percentage of transformants that have undergone nuclear fusion varies from 0.1 to 3%, indicating that fusion is not required for the uptake of DNA by yeast spheroplasts.
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