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Response of yeast cells to high glucose involves molecular and physiological differences when compared to other osmostress conditions.

Yeast cells can be affected by several causes of osmotic stress, such as high salt, sorbitol or glucose concentrations. The last condition is particularly interesting during natural processes where this microorganism participates. Response to osmostress requires the HOG (High Osmolarity Glycerol) pathway and several transcription factors, including Hot1, which plays a key role in high glucose concentrations. In this work, we describe how the yeast response to osmotic stress shows differences in accordance with the stress agent responsible for it. Compared with other conditions, under high glucose stress, delocalization of MAPK (Mitogen-Activated Protein Kinase) Hog1 is slower, induction of HOT1 expression is higher and Msn2/4 transcription factors are involved to a lesser extent. The transcriptomic analyses carried out with samples incubated for 30 min in the presence of high glucose or sorbitol reveal the presence of two functional categories with a differential expression between these conditions: glycogen biosynthesis and mobilization, and membrane-anchored proteins. We present data to demonstrate that the cells treated with 20% (w/v) (1.11 M) glucose contain higher chitin levels and are more sensitive to calcofluor white and ethanol.