Cited by 166Evolution and Genetic DynamicsFungal and yeast genetics researchGenetics, Aging, and Longevity in Model Organisms

Adaptation of Saccharomyces cerevisiae to saline stress through laboratory evolution

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DHAR, R., SÄGESSER, R., WEIKERT, C., YUAN, J., WAGNER, A.·2011·Journal of Evolutionary Biology

Abstract

Most laboratory evolution studies that characterize evolutionary adaptation genomically focus on genetically simple traits that can be altered by one or few mutations. Such traits are important, but they are few compared with complex, polygenic traits influenced by many genes. We know much less about complex traits, and about the changes that occur in the genome and in gene expression during their evolutionary adaptation. Salt stress tolerance is such a trait. It is especially attractive for evolutionary studies, because the physiological response to salt stress is well‐characterized on the molecular and transcriptome level. This provides a unique opportunity to compare evolutionary adaptation and physiological adaptation to salt stress. The yeast Saccharomyces cerevisiae is a good model system to study salt stress tolerance, because it contains several highly conserved pathways that mediate the salt stress response. We evolved three replicate lines of yeast under continuous salt (NaCl) stress for 300 generations. All three lines evolved faster growth rate in high salt conditions than their ancestor. In these lines, we studied gene expression changes through microarray analysis and genetic changes through next generation population sequencing. We found two principal kinds of gene expression changes, changes in basal expression (82 genes) and changes in regulation (62 genes). The genes that change their expression involve several well‐known physiological stress‐response genes, including CTT1, MSN4 and HLR1. Next generation sequencing revealed only one high‐frequency single‐nucleotide change, in the gene MOT2, that caused increased fitness when introduced into the ancestral strain. Analysis of DNA content per cell revealed ploidy increases in all the three lines. Our observations suggest that evolutionary adaptation of yeast to salt stress is associated with genome size increase and modest expression changes in several genes.

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Crossref · 10.1111/j.1420-9101.2011.02249.x

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  • Sulfate limitation led to mutations affecting TOR signaling via an RRN3 mutation and a genomic amplification of the high-affinity sulfate transporter SUL1 in S. cerevisiae.

    “Finally, another example of nutrient stress selection in S. cerevisiae showed that sulfate limitation led to mutations affecting TOR signaling via an RRN3 mutation and a genomic amplification of the high-affinity sulfate transporter SUL1[103].”

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Authors
DHAR, R., SÄGESSER, R., WEIKERT, C., YUAN, J., & WAGNER, A.
Affiliations
SIB Swiss Institute of Bioinformatics (CH)
Corresponding author
WAGNER, A.
Venue
Journal of Evolutionary Biology
Published
2011-03-07
Volume
24
Issue
5
Pages
1135-1153
ISSN
  • 1010-061X (ISSN-L)
  • 1420-9101
OpenAlex
W1805449453
Cited by
165
References
132
Citations by year
2026: 5 · 2025: 8 · 2024: 9 · 2023: 18 · 2022: 9 · 2021: 10 · 2020: 22 · 2019: 8 · 2018: 8 · 2017: 9 · 2016: 4 · 2015: 12 · 2014: 16 · 2013: 14 · 2012: 9
FWCI
8.59
Type
journal article
Language
en
Open access
Locations
  • Journal of Evolutionary Biology (publishedVersion)
  • PubMed (publishedVersion)
  • Zurich Open Repository and Archive (University of Zurich) (acceptedVersion, other-oa)
  • Zurich Open Repository and Archive (University of Zurich) (submittedVersion, other-oa)
  • Zurich Open Repository and Archive (University of Zurich)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Evolution and Genetic Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
Keywords
Saccharomyces cerevisiae, salt tolerance, experimental evolution, adaptive evolution, gene expression changes, polygenic traits, CTT1, Msn4, genome size, NaCl stress, stress response genes
MeSH terms
Adaptation, Biological, Biological Evolution, Gene Amplification, Genes, Fungal, Ploidies, Saccharomyces cerevisiae, Sodium Chloride, Gene Expression Regulation, Fungal, Electrophoresis, Gel, Pulsed-Field, Gene Deletion, Sequence Analysis, DNA, Gene Duplication, Gene Expression Profiling, Salinity

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