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The use of new transgenic yeasts in industry carries a potential environmental risk because their dispersal, introducing new artificial genetic combinations into nature, could have unpredictable consequences. This risk could be avoided by using sterile transgenic yeasts that are unable to sporulate and mate with wild yeasts. These sterile yeasts would not survive the annual cyclic harvesting periods, being condemned to disappear in the wineries and vineyards in less than a year. We have constructed new ime1Delta wine yeasts that are unable to sporulate and mate, bear easy-to-detect genetic markers, and quickly disappear in grape must fermentation immediately after sporulation of the yeast population. These sterile yeasts maintained the same biotechnological properties as their parent yeasts without any detectable deleterious effect of the ime1Delta mutation. These yeasts are therefore interesting biotechnologically for food industry applications and for genetically modified microorganism environmental monitoring studies.

Construction of Sterileime1Δ-TransgenicSaccharomyces cerevisiaeWine Yeasts Unable To Disseminate in Nature