Volume 20, Issue 15, Pages (August 2010)

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Volume 20, Issue 15, Pages 1383-1388 (August 2010) Determinants of Divergent Adaptation and Dobzhansky-Muller Interaction in Experimental Yeast Populations  James B. Anderson, Jason Funt, Dawn Anne Thompson, Snehit Prabhu, Amanda Socha, Caroline Sirjusingh, Jeremy R. Dettman, Lucas Parreiras, David S. Guttman, Aviv Regev, Linda M. Kohn  Current Biology  Volume 20, Issue 15, Pages 1383-1388 (August 2010) DOI: 10.1016/j.cub.2010.06.022 Copyright © 2010 Elsevier Ltd Terms and Conditions

Figure 1 Contribution of S2 and S6 Evolved Alleles to Fitness in High Salt Shown are fitness measurements (OD600, mean and standard error, normalized to the progenitor value) for 48 offspring fully genotyped for all coding alleles segregating in the cross S2 × P (A, C, 5 loci) and in the cross S6 × P (B, D, 3 loci). Data are aggregated by specific alleles as marked (in each marked category, e.g., “PMA1-2,” the other alleles are segregating). Full data (including intergenic loci) are available in Tables S3 and S4. (A and B) The bars represent the average fitness effect of each variant across all offspring. Light gray bars denote ancestral alleles; dark bars denote evolved alleles. Fitness of evolved parent is shown at the upper right corner. Significant differences are noted with a p value. (C and D) Average pairwise effects of the two most advantageous mutations in each strain. Shown are the same data as in (A) and (B) but averaged for two-locus genotypes showing positive interaction. Superscript a denotes ancestral allele; superscript e denotes evolved allele. Interaction was tested by analysis of variance (ANOVA); all p values appear in Table S8. The measure of dispersion (error bars) was standard error. Current Biology 2010 20, 1383-1388DOI: (10.1016/j.cub.2010.06.022) Copyright © 2010 Elsevier Ltd Terms and Conditions

Figure 2 Contribution of M8 Evolved Alleles to Fitness in Low Glucose (A and B) Average fitness effect of each variant across the segregant offspring at log phase (20 hr) and postdiauxic shift (30 hr) during growth in low glucose. Shown are fitness measurements (OD600, mean and standard error, normalized to the progenitor value) for 48 progeny from an M8 × P cross, fully genotyped for all five coding loci identified by sequencing, at 20 hr (A) and 30 hr (B) of growth on glucose. Data are aggregated by specific alleles as marked (in each marked category, e.g., “MKT1,” the other alleles are segregating). Full data are available in Table S5. Light gray bars denote ancestral alleles; dark bars denote evolved alleles. Fitness of evolved parent is shown at the upper right corner. Significant differences are noted with a p value. All p values appear in Table S8. (C) Evolved alleles of MDS3 and MKT1 (MDS3e and MKT1e) account for the M8 phenotype. Shown are growth curves (OD600) from three tetrads from each of two independent crosses segregating for MDS3 and MKT1 and from no other evolved alleles (based on full genotyping). The number of replicates for each time course varied between four and eight, reflecting independent assortment. The evolved allele of MDS3 (green) confers a benefit early, whereas that of MKT1 (blue) confers a benefit late in the growth cycle, relative to the ancestral genotype (black). Together, these two alleles produce a phenotype (red) that matches that of the M8 strain (dashed). The measure of dispersion (error bars) was standard error. Current Biology 2010 20, 1383-1388DOI: (10.1016/j.cub.2010.06.022) Copyright © 2010 Elsevier Ltd Terms and Conditions

Figure 3 Global Expression Changes in Evolved Strains Associated with the Adaptive Genetic Changes (A) Genome-wide expression profiles from P, S2, S6, and M8 strains grown in YPD, low-glucose (LG), and high-salt (HS) environments. Red denotes induced compared to mean of all strains in that condition; green denotes repressed compared to mean of all strains in that condition. (B) Genes with high expression specific to S6 across all conditions are enriched for Cyc8-Tup1 targets and for osmotic response genes. Shown is a zoomed-in cluster from (A). Yellow bar denotes genes whose expression is induced in a deletion of the TUP1 gene [19]; purple bar denotes genes whose expression is induced during the osmotic stress response (OSR) to high salt [20]. Genes are reordered by the TUP1 and OSR annotations. (C) Genes with high expression specific to M8 across all conditions are induced in the RM-11 wine strain and enriched for Puf3 targets. Top: zoomed-in cluster from (A); bottom: expression of the same genes in the laboratory strain BY and in the wild wine strain RM. Blue bar denotes genes in the Puf3 module [22] whose expression quantitative trait loci in a cross between BY and RM has been linked to the same genetic change in MKT1 found also in the M8 strain. Genes are reordered by membership in the Puf3 module. Current Biology 2010 20, 1383-1388DOI: (10.1016/j.cub.2010.06.022) Copyright © 2010 Elsevier Ltd Terms and Conditions

Figure 4 Dobzhansky-Muller Interactions between the Evolved Alleles of PMA1 and MKT1 (A) Dobzhansky-Muller (DM) interaction between the evolved alleles of PMA1 and MKT1 at 24 hr in low glucose. Shown are the fitness measurements (OD600, mean and standard error, normalized to the progenitor value) of 96 offspring of a cross between S2 and M8 in the low-glucose environment at 24 hr, grouped by their two-locus genotypes for PMA1 and MKT1 (e denotes evolved allele; a denotes ancestral allele); note the depressed fitness of the genotype carrying both evolved alleles of these genes. ANOVA: evolved allele of PMA1, p < 10−4; evolved allele of MKT1, p < 10−4; interaction of the evolved alleles of PMA1 and MKT1, p < 0.015. Full data are available in Table S6, and all p values of all tests are listed in Table S8. (B) DM interaction between the evolved alleles of PMA1 and MKT1 along the growth curve. Shown are growth curves from three tetrads from each of two independent crosses segregating for PMA1 and MKT1 and carrying no other evolved alleles (based on full genotyping). The number of replicates for each time course varied between four and eight, reflecting independent assortment. The genotype carrying the evolved alleles of PMA1 and MKT1 (red) shows poor growth at all time points (up to 27 hr) relative to the other genotypes. The other genotypes are marked as PMA1e (green), MKT1e (blue), ancestral (PMA1a MKT1a, black), and M8 (dashed). (C) Absence of an interaction between PMA1 and MDS3; analysis as in (B). Shown are PMA1e (green), MDS3e (blue), PMA1e MDS3e (red), ancestral (PMA1a MDS3a, black), and M8 (dashed). The measure of dispersion (error bars) was standard error. Current Biology 2010 20, 1383-1388DOI: (10.1016/j.cub.2010.06.022) Copyright © 2010 Elsevier Ltd Terms and Conditions