Cited by 31Evolution and Genetic DynamicsFungal and yeast genetics researchGenetic diversity and population structure

The dynamics of adaptation to stress from standing genetic variation and de novo mutations

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Ament-Velásquez, Sandra Lorena, Gilchrist, Ciaran, Rêgo, Alexandre, Bendixsen, Devin P, Brice, Claire, Grosse-Sommer, Julie Michelle, Rafati, Nima, Stelkens, Rike·2022·Molecular Biology and Evolution

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Abstract

Adaptation from standing genetic variation is an important process underlying evolution in natural populations, but we rarely get the opportunity to observe the dynamics of fitness and genomic changes in real time. Here, we used experimental evolution and Pool-Seq to track the phenotypic and genomic changes of genetically diverse asexual populations of the yeast Saccharomyces cerevisiae in four environments with different fitness costs. We found that populations rapidly and in parallel increased in fitness in stressful environments. In contrast, allele frequencies showed a range of trajectories, with some populations fixing all their ancestral variation in <30 generations and others maintaining diversity across hundreds of generations. We detected parallelism at the genomic level (involving genes, pathways, and aneuploidies) within and between environments, with idiosyncratic changes recurring in the environments with higher stress. In particular, we observed a tendency of becoming haploid-like in one environment, whereas the populations of another environment showed low overall parallelism driven by standing genetic variation despite high selective pressure. This work highlights the interplay between standing genetic variation and the influx of de novo mutations in populations adapting to a range of selective pressures with different underlying trait architectures, advancing our understanding of the constraints and drivers of adaptation.

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  • This expected progression is seen in experimental yeast populations exposed to different stress-inducing substances; some populations rapidly depleted pre-existing variation in the first 30 generations, increasing their reliance on new mutations in later generations.

    “This expected progression is seen in experimental yeast populations exposed to different stress-inducing substances; some populations (but not others) rapidly depleted pre-existing variation in the first 30 generations, increasing their reliance on new mutations in later generations (Ament-Velásquez et al., 2022).”

    From Genomics of plant speciation (2023) · cites this paper as Ament-Velásquez et al., 2022

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1 of the 105 references couldn’t be matched to a known paper.

Research works printed but not linked: 2

  1. Trachtulcová P, Janatová I, Kohlwein SD, Hašek J. 2000. Saccharomyces cerevisiae gene ISW2 encodes a microtubule-interacting protein required for premeiotic DNA replication. Yeast 16(1): 35– 47. 10620773
  2. Wickham H. 2016. Ggplot2: elegant graphics for data analysis. New York: Springer-Verlag.

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Authors
Ament-Velásquez, S. L., Gilchrist, C., Rêgo, A., Bendixsen, D. P., Brice, C., Grosse-Sommer, J. M., Rafati, N., & Stelkens, R.
Affiliations
  • Division of Population Genetics, Department of Zoology, Stockholm University , Svante Arrheniusväg 18 B, 106 91 Stockholm , Sweden
  • Stockholm University (SE)
  • Uppsala University (SE)
Corresponding author
Stelkens, Rike
Venue
Molecular Biology and Evolution
Published
2022-11-01
Volume
39
Issue
11
ISSN
  • 0737-4038 (ISSN-L)
  • 1537-1719
OpenAlex
W4308253979
Cited by
31
References
105
Citations by year
2026: 9 · 2025: 8 · 2024: 8 · 2023: 5 · 2022: 1
FWCI
3.32
Type
journal article
Language
en
Open access
Locations
  • Molecular Biology and Evolution (publishedVersion, cc-by)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • KTH Publication Database DiVA (KTH Royal Institute of Technology) (submittedVersion, other-oa)
  • Edinburgh Research Explorer (University of Edinburgh) (submittedVersion, cc-by)
Funders
  • Swedish Research Council
  • Knut and Alice Wallenberg Foundation
  • Stockholm University
  • SciLifeLab
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 › Genetics › Genetic diversity and population structure
Keywords
standing genetic variation, de novo mutations, stress adaptation, parallel evolution, Saccharomyces cerevisiae, asexual populations, allele frequency dynamics, aneuploidy, fitness cost, experimental evolution, pool-seq
MeSH terms
Adaptation, Physiological, Mutation, Saccharomyces cerevisiae, Stress, Physiological, Genetic Variation, Evolution, Molecular, Genetic Fitness

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