Yeast translational response to high salinity: Global analysis reveals regulation at multiple levels
Yeast translational response to high salinity: Global analysis reveals regulation at multiple levels
Genome-wide studies of steady-state mRNA levels revealed common principles underlying transcriptional changes in response to external stimuli. To uncover principles that govern other stages of the gene-expression response, we analyzed the translational response and its coordination with transcriptome changes following exposure to severe stress. Yeast cells were grown for 1 h in medium containing 1 M NaCl, which elicits a maximal but transient translation inhibition, and nonpolysomal or polysomal mRNA pools were subjected to DNA-microarray analyses. We observed a strong repression in polysomal association for most mRNAs, with no simple correlation with the changes in transcript levels. This led to an apparent accumulation of many mRNAs as a nontranslating pool, presumably waiting for recovery from the stress. However, some mRNAs demonstrated a correlated change in their polysomal association and their transcript levels (i.e., potentiation). This group was enriched with targets of the transcription factors Msn2/Msn4, and the translational induction of several tested mRNAs was diminished in an Msn2/Msn4 deletion strain. Genome-wide analysis of a strain lacking the high salinity response kinase Hog1p revealed that the group of translationally affected genes is significantly enriched with motifs that were shown to be associated with the ARE-binding protein Pub1. Since a relatively small number of genes was affected by Hog1p deletion, additional signaling pathways are likely to be involved in coordinating the translational response to severe salinity stress.
Salinity, Saccharomyces cerevisiae Proteins, Gene Expression Profiling, Saccharomyces cerevisiae, Sodium Chloride, Up-Regulation, Gene Expression Regulation, Fungal, Polyribosomes, Protein Biosynthesis, Genome, Fungal, Mitogen-Activated Protein Kinases
Salinity, Saccharomyces cerevisiae Proteins, Gene Expression Profiling, Saccharomyces cerevisiae, Sodium Chloride, Up-Regulation, Gene Expression Regulation, Fungal, Polyribosomes, Protein Biosynthesis, Genome, Fungal, Mitogen-Activated Protein Kinases
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