QuartetS-DB: a large-scale orthology database for prokaryotes and eukaryotes inferred by evolutionary evidence

BMC Bioinformatics

Table 2 Summary of the content of QuartetS-DB

Number of species	1621
Bacteria	1365
Archaea	92
Eukaryotes	164
Fungi	64
Protozoa	33
Invertebrate	30
Mammal	15
Plant	15
Non-mammal vertebrate	7
Number of proteins	7322227
Number of putative pairwise orthologs¹	4421262
Number of pairwise orthologs (Cutoff Ω = 20)	4022809
Number of orthologous groups (OG)	318618
Number of OGs with gene symbols²	78004
Number of OGs with functional descriptions²	124074
Number of OGs with GO annotations²	54962
Number of gene trees (for OG with size ≥ 4)	236962
Median size of OGs	6
Number of inparalog groups	515055

¹ Obtained by selecting a large value (10,000) for the QuartetS cutoff Ω, which is equivalent to claiming all BBH pairs as orthologs.
² Based on consensus annotation of the proteins constituting each group.

ISSN: 1471-2105