Fig. 3.

Many HP1D paralogs have arisen by gene duplication during Drosophila evolution. (A) A schematic of the melanogaster species group of Drosophila investigated in detail in this report. Species that were sequenced by the modENCODE project (Chen et al. 2014), which were previously not analyzed for HP1 duplications (Levine et al. 2012) are highlighted in boldface. (B) Schematic of all HP1D paralogs identified in the melanogaster group of Drosophila species, indicating the chromodomain (black) and chromoshadow (gray) domains. Putative orthology is assigned via shared syntenic position in the genome, with genome coordinates corresponding to the syntenic region of the D. melanogaster genome. Species in which a particular HP1D paralog is found are indicated on the right.