Recurrent gene co-amplification on Drosophila X and Y chromosomes
Fig 5
Independent amplification of S-Lap1 / GAPsec in different species of the obscura group.
A. Genomic organization of S-Lap1 (red) and GAPsec (blue) genes on the X (dmir XR) and Y (dmir Y) chromosomes of D. miranda. We detect 11 copies of S-Lap1/2 and 6 copies of GAPsec on the X chromosome, and 5 copies of S-Lap1/2 and 4 copies of GAPsec on the Y chromosome of D. miranda. B. Genomic organization of S-Lap1 and GAPsec genes on the X (dath XR) of D. athabasca. We detect 5 copies of S-Lap1/2 and 6 copies of GAPsec on the X chromosome of D. athabasca. No assembly of the Y chromosome for D. athabasca exists. The location and orientation of each gene is represented by a single arrowhead. The arrowhead numbers correspond to the gene copy names in the gene trees. C. Gene trees of S-Lap1 and GAPsec copies of D. miranda and D. athabasca. RAxML maximum likelihood phylogenies were inferred from multiple sequence alignments of the gene copies shown in (A) and (B). Nodes with bootstrap support values less than 50 are collapsed. Alignments used to generate the trees shown in Fig 4C are provided as S6 and S7 Data.