Figure 1

Comparison of genic composition of the genomes of S. pistillata and A. digitifera. Genes were assigned to closest genera based on BLASTP best hits, and distribution was visualized in chord diagrams (top 6 genera are shown, remaining hits are summed up in ‘others’). The inlet shows a simplified phylogeny of the phylum Cnidaria to ease orientation and interpretation. (A) Both coral genomes appear similar in composition when queried against the combined NCBI ‘nr’ database and the Aiptasia gene models. The proportion of matching genes in S. pistillata and A. digitifera to other organisms is color-coded as follows: S. pistillata/A. digitifera genes with best matches to Aiptasia (dark green), to Nematostella (light green), to Branchiostoma (lancelet, greenish-yellow), to Saccoglossus (acorn worm, yellow), to Lingula (brachiopod, dark yellow), to Strongylocentrotus (sea urchin, orange), and to ‘others’ (dark orange). Genes without any matches are in red (S. pistillata) and blue (A. digitifera). (B) If coral genomic gene sets are included (i.e., genes from S. pistillata are allowed to match against A. digitifera and vice versa), many more A. digitifera genes match homologs in S. pistillata homologs than vice versa. As a consequence of the asymmetrical matching, the number of A. digitifera matches to other genera is vastly reduced. The proportion of matching genes between S. pistillata and A. digitifera to each other and other organisms is color-coded as follows: S. pistillata and A. digitifera genes matching each other (blue); S. pistillata/A. digitifera genes with best matches to Aiptasia (dark green), to Nematostella (light green), to Lingula (brachiopod, dark yellow), to Saccoglossus (acorn worm, yellow), to Strongylocentrotus (sea urchin, dark yellow), to Crassostrea (oyster, orange); and to ‘others’ (dark orange); S. pistillata genes without any matches (red).