Pervasive function and evidence for selection across standing genetic variation in S. cerevisiae.
TLDR
High-resolution genetic mapping of metabolic traits in S. cerevisiae is performed and evidence for selection across standing genetic variation is shown, underscoring the power of super-resolution mapping of ecologically relevant traits in understanding adaptation and evolution.Abstract:
Quantitative genetics aims to map genotype to phenotype, often with the goal of understanding how organisms evolved. However, it remains unclear whether the genetic variants identified are exemplary of evolution. Here we analyzed progeny of two wild Saccharomyces cerevisiae isolates to identify 195 loci underlying complex metabolic traits, resolving 107 to single polymorphisms with diverse molecular mechanisms. More than 20% of causal variants exhibited patterns of emergence inconsistent with neutrality. Moreover, contrary to drift-centric expectation, variation in diverse wild yeast isolates broadly exhibited this property: over 30% of shared natural variants exhibited phylogenetic signatures suggesting that they are not neutral. This pattern is likely attributable to both homoplasy and balancing selection on ancestral polymorphism. Variants that emerged repeatedly were more likely to have done so in isolates from the same ecological niche. Our results underscore the power of super-resolution mapping of ecologically relevant traits in understanding adaptation and evolution. Genetic architecture underlies the complexity of heritable traits. Here, the authors perform high-resolution genetic mapping of metabolic traits in S. cerevisiae and show evidence for selection across standing genetic variation.read more
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