Fig. 2

Stra8 proposed gene evolution in teleosts following the TGD WGD. Maximum-likelihood phylogeny of Stra8 (a) was performed using the PhyML software [38] implemented in the Phylogeny.fr web platform [39] using default “a la carte” parameters and a bootstrapping procedure (N = 100 bootstraps). The resulting tree was exported and edited in Evolview [40]. Input sequences were retrieved using a tblastn search of the PhyloFish database using as bait the Southern catfish Stra8 protein (AGM53488.1). PhyloFish Stra8 coding sequences (in bold on the tree) were submitted to GenBank with the following accession numbers: Lepisosteus oculatus (KU161162), Osteoglossum bicirhosum (KU161164), Anguilla anguilla (KU161163), Alosa alosa (KU161165), Astyanax mexicanus (KU161166), Apteronotus albifrons (KU161167), Oncorhynchus mykiss (KU161168), Salvelinus fontinalis (KU161169), Coregonus lavaretus (KU161172), Coregonus clupeaformis (KU161171), Salmo trutta (KU161170), Thymallus thymallus (KU161173), Umbra pygmae (KU161174) and Plecoglossus altivelis (KU161175). This dataset was complemented with two additional teleost public sequences of Stra8 in Esox lucius (XP_012986862) and Astyanax mexicanus (XP_007229918.1) and a Stra8 sequence deduced from the Anguilla japonica genome (scaffold 6093). The tree was rooted with tetrapod sequences using the Homo sapiens STRA8 (AAP47163.1) and Alligator mississippiensis Stra8 (XP_006261218.1). b Schematic representation of the deduced evolution of stra8 based on PhyloFish sequences. This analysis suggests that stra8 was completely lost in Acanthomorpha, but also specifically and independently lost in the Cypriniformes lineage. The tree is based on [2]