Fig. 8

Loss of polycomb complexes from brown algae. a Core components of the polycomb complexes PRC2 (mauve) and PRC1 (blue) in Homo sapiens, Arabidopsis thaliana, Phaeodactylum tricornutum and Ectocarpus sp.. Mauve or blue circles indicate the presence of a PRC2 or PRC1 gene, respectively. RbAp48 is indicated in pink when it probably represents a component of other cellular complexes (see text for details). Alternative proteins are shown for each component. Empty, dotted circles indicate components that are absent from Ectocarpus. All P. tricornutum and Ectocarpus sp. protein names should be prefixed with Phatr3 or Ec-, respectively, e.g. Phatr3_J17948, Ec-21_004560. b Schematic phylogenetic tree indicating PRC2 and PRC1 genes present in Homo sapiens, Arabidopsis thaliana and four selected stramenopiles. Red bars indicate predicted approximate time points for loss of the PRC1 and PRC2 complexes during stramenopile evolution. Approximate divergence times (± 100 My) are based on Brown and Sorhannus [27]