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Budding yeast rapidly adapted to nitrogen-limited environments by evolving copy number variants (CNVs) and specific gene mutations. Genetic network evolution, influenced by epistasis, enhances predictability of adaptive evolution.

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Area of Science:

  • Evolutionary Biology
  • Molecular Evolution
  • Yeast Genetics

Background:

  • Understanding the molecular mechanisms of adaptive evolution is a key goal in evolutionary biology.
  • Saccharomyces cerevisiae (budding yeast) provides a tractable model for studying rapid adaptation.
  • Nitrogen availability is a critical environmental factor influencing yeast growth and evolution.

Purpose of the Study:

  • To investigate the molecular basis of adaptive evolution in yeast populations under nitrogen limitation.
  • To identify genetic changes, including copy number variants and point mutations, driving adaptation.
  • To explore the role of gene network evolution and epistasis in adaptive strategies.

Main Methods:

  • Propagating yeast populations for over 200 generations in distinct nitrogen-limiting conditions.
  • Identifying copy number variants (CNVs) and point mutations using genomic analysis.
  • Assessing the fitness effects of individual alleles and their combinations, considering evolutionary history and epistasis.

Main Results:

  • Rapid adaptation was dominated by de novo CNVs, often containing nitrogen transporter genes (e.g., PUT4, DUR3, DAL4).
  • Point mutations revealed common adaptive themes in functional modules like PI3P metabolism and vacuole biogenesis.
  • Repeated selection of multi-locus genotypes (GAT1, MEP2, LST4) demonstrated epistasis-constrained evolutionary pathways.

Conclusions:

  • Adaptive evolution in nutrient-limited environments is significantly shaped by CNVs and specific gene network alterations.
  • Signaling pathways (TORC1, Ras/PKA) and gene network polymorphisms (GNPs) are general mechanisms for nutrient limitation adaptation.
  • Predicting adaptive evolution is enhanced by understanding the selective environment and key regulatory mechanisms.