Functional Distribution of Genes Proposed as Being Acquired by Horizontal Gene Transfer
| Organism | HGT | Info. (%) | Cell (%) | Meta. (%) | Poor (%) | − (%) |
| Archaeoglobus fulgidus | 179 | 6 (2.2) | 22 (8.1) | 17 (2.7) | 31 (6.0) | 103 (14.5) |
| Aquifex aeolicus | 72 | 7 (3.2) | 12 (3.8) | 15 (3.6) | 20 (6.4) | 18 (6.9) |
| Borrelia burgdorferi | 12 | 2 (1.1) | 3 (1.7) | 1 (0.8) | 3 (2.2) | 3 (1.3) |
| Bacillus subtilis | 537 | 54 (11.5) | 34 (5.8) | 76 (8.0) | 42 (7.3) | 331 (21.8) |
| Chlamydia pneumoniae | 55 | 6 (3.4) | 4 (3.0) | 10 (4.9) | 6 (5.3) | 29 (6.8) |
| Chlamydia trachomatis | 36 | 5 (2.9) | 5 (3.8) | 9 (4.8) | 0 (0.0) | 17 (5.7) |
| Escherichia coli | 381 | 23 (4.8) | 41 (6.6) | 42 (3.8) | 27 (5.4) | 248 (15.7) |
| Haemophilus influenzae | 96 | 3 (1.1) | 19 (7.0) | 10 (2.2) | 3 (1.4) | 61 (12.0) |
| Helicobacter pylori 26695 | 89 | 11 (5.0) | 3 (1.1) | 5 (1.6) | 3 (1.6) | 67 (11.6) |
| Helicobacter pylori J99 | 80 | 7 (3.2) | 6 (2.3) | 5 (1.6) | 4 (2.2) | 58 (11.5) |
| Mycoplasma genitalium | 67 | 26 (19.1) | 10 (16.7) | 11 (12.6) | 6 (9.1) | 14 (10.7) |
| Methanococcus jannaschii | 77 | 8 (3.6) | 11 (7.5) | 6 (1.6) | 7 (1.8) | 45 (7.8) |
| Mycoplasma pneumoniae | 39 | 8 (5.1) | 0 (0.0) | 3 (2.7) | 2 (2.7) | 26 (9.6) |
| Methanobacterium thermoautotrophicum | 179 | 4 (1.7) | 19 (8.8) | 26 (5.6) | 44 (11.1) | 86 (15.5) |
| Mycobacterium tuberculosis | 187 | 6 (1.6) | 20 (4.9) | 35 (4.0) | 17 (3.2) | 109 (6.2) |
| Pyrococcus horikoshii | 154 | 10 (4.2) | 11 (6.1) | 8 (2.1) | 23 (4.9) | 102 (12.7) |
| Rickettsia prowazekii | 28 | 8 (4.4) | 3 (1.9) | 12 (6.6) | 4 (3.6) | 1 (0.5) |
| Synechocystis PCC6803 | 219 | 14 (5.3) | 31 (5.2) | 15 (2.6) | 22 (5.0) | 137 (10.6) |
| Thermotoga maritima | 198 | 13 (5.3) | 18 (6.5) | 55 (10.7) | 47 (12.0) | 65 (15.6) |
| Treponema pallidum | 77 | 8 (4.5) | 17 (8.7) | 2 (1.4) | 17 (10.6) | 33 (9.2) |
[i] The functional classification available in the COG database (Tatusov et al. 2000) was used. The table shows the number and the group percentage of the genes proposed as being acquired by HGT. The functional groups used were: Info, Information storage and processing; Cell, cellular processes; Meta, metabolism; Poor, poorly characterized; −, not present in any cluster of orthologous group.