Figure 6.

The levels of gene expression correlate with the level of expression divergence in duplicates in which gene copies are either discordant (one copy up-regulated and the other copy down-regulated) or one copy only altered under stress. Transcriptional alteration patterns of duplicates were measured in four stress conditions (ethanol, glycerol, lactate and oxidative stress in a medium supplemented with dextrose). Expression divergence of duplicates was measured as 1 – (the expression of the lowest expressed copy divided by the expression of the highest expressed copy). Spearman correlation (ρ) between the levels of gene expression (measured as the logarithmic transformation of the Reads Per billion (RPKM)) and the levels of expression divergence was tested for significance. Significant plots are indicated in bold. We found significant associations between the levels of gene expression and the expression divergence between gene copies of discordant duplicates and those with one copy altered but not for up-regulated or down-regulated duplicates.