Table 1.
Phyletic distributions of the six families of UNGs
| Species/family | UNG* | AUDG* | MUG | SsUDG* DRUDG* |
| + UDGX* | ||||
| Bacteria | ||||
| Escherichia coli | 1 | 1 (MUG) | ||
| Haemophilus influenzae | 1 | 1 | ||
| Neisseria meningitidis | 1 | 1 | 1 (UDGX) | |
| Rickettsia prowazekii | 1 | |||
| Campylobacter jejuni | 1 | 1 | 1 (UDGX) | |
| Helicobacter pylori | 1 | 1 | ||
| Bacillus subtilis | 1 | |||
| Mycoplasma genitalium | 1 | |||
| Mycoplasma pneumoniae | 1 | |||
| Ureaplasma urealyticum | 1 | |||
| Deinococcus radiodurans | 1 | 1 | 1 (MUG) | 1 |
| Mycobacterium tuberculosis 1 | 1 | |||
| Streptomyces coelicolor | 1 | 2 | ||
| Synechocystis sp. | 1 | |||
| Chlamydia trachomatis | 1 | |||
| Chlamydophila pneumoniae 1 | ||||
| Treponema pallidum | 1 | |||
| Borrelia burgdorferi | 1 | 1(d)† | ||
| Aquifex aeolicus | 1 | |||
| Thermotoga maritima | 1 | |||
| Archaea | ||||
| Aeropyrum pernix | 1 | |||
| Archaeoglobus fulgidus | 1 | |||
| Pyrococcus horikoshii | 1 | |||
| Methanobacterium | ||||
| thermoautotrophicum | ||||
| Methanococcus jannaschii | ||||
| Eukaryota | ||||
| Saccharomyces cerevisiae | 1 | (r)‡ | ||
| Schizosaccharomyces pombe1 | 1(MUG) | |||
| Caenorhabditis elegans | 1 | |||
| Drosophila melanogaster | (?)§ | 1(MUG) | 1 | |
| Homo sapiens | 1 | 1(MUG) | 1 | |
| Large DNA viruses | ||||
| Poxviruses | 1 | |||
| Herpesviruses | 1 | |||
| Bacteriophages SPO1 | 1 |
*The number of detected representatives of each family is indicated for each species. Note that duplication is uncharacteristic of the UNGs. †(d) indicates a possibly disrupted version in which the amino-terminal conserved motifs are not detectable; ‡(r) indicates an apparent recent loss in S. cerevisiae, as the gene is retained in the related yeast Candida albicans; §(?) indicates the unusual lack of a detectable UNG in both the genome and EST sequences.