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Transcript expression in Saccharomyces cerevisiae at high salinity.

J Yale1, H J Bohnert

  • 1Department of Biochemistry, University of Arizona, Biosciences West, Tucson, Arizona 856721-0088, USA.

The Journal of Biological Chemistry
|March 30, 2001
PubMed
Summary
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High salinity rapidly alters Saccharomyces cerevisiae gene expression, with nucleotide and amino acid metabolism responding first. Stress responses evolve over time, impacting energy production and detoxification pathways.

Area of Science:

  • * Molecular Biology
  • * Genetics
  • * Biochemistry

Background:

  • * High salinity poses a significant stress to cellular organisms.
  • * Understanding yeast's response to salt stress is crucial for industrial applications and fundamental biology.

Purpose of the Study:

  • * To comprehensively analyze transcriptomic changes in Saccharomyces cerevisiae under high salinity conditions.
  • * To identify temporal patterns and functional categories of genes responding to salt stress.

Main Methods:

  • * Microarray analysis of 6144 open reading frames (ORFs) in yeast cells exposed to 1 M NaCl.
  • * Time-course analysis at 10, 30, and 90 minutes post-stress induction.
  • * Differential expression analysis to identify transcripts with >2-fold abundance changes.

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Main Results:

  • * A time-dependent increase in salinity-induced ORFs was observed (107 at 10 min, 243 at 30 min, 354 at 90 min).
  • * Early responses involved nucleotide/amino acid metabolism, followed by intracellular transport and protein synthesis.
  • * Energy production transcripts were consistently upregulated, with respiration-associated genes peaking at 30 min.
  • * At 90 min, detoxification, transporter superfamily genes, and various metabolic pathways showed high expression.

Conclusions:

  • * Saccharomyces cerevisiae exhibits a dynamic and complex transcriptomic response to high salinity stress.
  • * Temporal profiling reveals distinct phases of gene expression, from initial metabolic adjustments to later stress adaptation mechanisms.
  • * The study highlights the importance of glycerol biosynthesis pathways in mitigating salt stress.