Figure 2. Transferred Sfps Cluster in Small Groups throughout the D. melanogaster Autosomes.

(A) Euchromatic genomic locations of the autosomal Sfps are shown, based on the version 5.2 genome assembly. Open points indicate Sfps that occur in a cluster, filled points indicate those that do not. We observed significantly more clusters of genes than were found when randomly selecting 138 genes with the observed chromosomal distribution (1,000 simulations; median number of clusters: 3; range: 0–9).

(B) Genomic map of Chromosome 2L containing the tandem duplicates CG17472 and CG31680. CG17472, which is present in all five species of the melanogaster subgroup, contains several residues under positive selection. Orange bars indicate naturally occurring transposon remnants. A pseudogenized copy of the locus is also indicated (ψ).

(C) Phylogenetic analysis of the tandem gene duplication. Numbers above branches are branch estimates of ω in the free-ratio model. Italicized numbers under nodes indicate percent bootstrap support based on 1,000 replicates. Numbers at the tips of the non-melanogaster branches of the tree are the GLEANR-predicted gene numbers for the indicated species.