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Interactions with different yeast strains promote a common and specific transcriptomic response in S. cerevisiae to co-cultivation

AuthorsCuriel, José Antonio ; Morales, Pilar ; González García, Ramón ; Tronchoni, Jordi
Issue Date26-Jun-2017
Citation33rd International Specialised Symposium on Yeast (2017)
7th Congress of European Microbiologists FEMS (2017)
AbstractIn an effort to outstand from competitors, wine industry is incorporating non-Saccharomyces yeast as starters, either in sequential or co-inoculated fermentations with Saccharomyces cerevisiae. In a previous paper, we showed the reciprocal transcriptional effect of two wine yeast strains co-cultivated in scaled lab fermentation. Different non-Saccharomyces wine yeast species are tested by the wine industry as potential starter strains. The different interactions that may occur with S. cerevisiae will have an impact in the final product. Here, we analysed the transcriptional response to co-cultivation using RNAseq data of an industrial S. cerevisiae yeast strain. The strain was grown in a mixed culture with three different yeast strains. Focused in the initial stages of wine fermentation, the answer of S. cerevisiae is analysed in order to uncover common and specific responses to different yeast interactions. The different yeast species promote a common response in S. cerevisiae with particular characteristics. The general answer found in the three yeast assayed is related to glucose uptake and glycolysis, membrane lipid metabolism, cell wall and the use of alternative nitrogen sources. One particularly interesting observation was that under conditions of co-cultivation with T. delbrueckii, S. cerevisiae by-passes normal nitrogen and glucose catabolite repression, up-regulating a series of genes that are usually transcribed under low concentrations of sugars (low affinity glucose transporters), or growing on non-preferred nitrogen sources. One illustrative example, found in all mixed cultures, is the DAL cluster gene family, up-regulated during co-cultivation.
DescriptionTrabajo presentado en el 33rd International Specialised Symposium on Yeast (ISSY33), celebrado en Cork (Irlanda), del 26 al 29 de junio de 2017 -- Trabajo presentado al 7th Congress of European Microbiologists (FEMS), celebrado en Valencia (España) del 9 al 13 de julio de 2017
Appears in Collections:(ICVV) Comunicaciones congresos
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