Figure 1

Comparison of WGD and PGD scenarios in A. gossypii DS block 7 (A) and chromosome I (B). A. gossypii genes and gene segments with homologues in S. cerevisiae chromosomes (shown with different colors) are transformed into corresponding S. cerevisiae chromosomal segments. When extending results to the entire genome, these segments need to be rearranged into complete S. cerevisiae chromosomes. Arrows with numbers in A represent ORFs and their orientation, and are highlighted in black when subject to duplication or rearrangement. Terminal rearrangements are indicated by arrows. Vertical lines in B represent duplications. The absence of S. cerevisiae chromosome I homologues of A. gossypii chromosome I genes is surprising, given the high levels of rearrangement observed. This suggests biases in synteny that are incompatible with the WGD scenario. The locations of the representative synteny blocks examined are indicated in A. gossypii chromosome I.