TABLE 1.
Numbers of genes in the ABC families
| Family | No. of ABC genesa in:
|
|||
|---|---|---|---|---|
| Dictyostelium discoideum | Saccharomyces cerevisiae | Homo sapiens | Arabidopsis thaliana | |
| ABCA | ||||
| Full | 7 (1 cluster) | None | 12 | 1 |
| Half | 5 (2 clusters) | None | None | 16 |
| ABCB | ||||
| Full | 2 (1 cluster) | 1 | 4 | 22 |
| Half | 7 (4 clusters) | 3 | 7 | 5 |
| ABCC | 14 (3 clusters) | 7 | 12 | 15 |
| ABCD | ||||
| Full | None | None | None | 1 |
| Half | 3 (2-3 clusters) | 2 | 4 | 1 |
| ABCE | 1 (1 cluster) | 1 | 1 | 2 |
| ABCF | 4 (3 clusters) | 5 | 3 | 5 |
| ABCG | ||||
| Full | 15 (2 clusters) | 10 | None | 13 |
| Half | 6 (3 clusters) | 1b | 5 | 29 |
| Otherc | 4 (3 clusters) | 2 | 2 | 16 |
| Total | 68 (25 clusters) | 32 | 50 | 127 |
a
Numbers of independent clusters are deduced from full sequence trees for each family. Numbers of genes in S. cerevisiae, H. sapiens, and A. thaliana are based on previous analyses of these organisms (3, 11, 29).
b
This protein corresponds to a half-transporter plus part of a TM domain.
c
ArsA homologs are included, but the SMC group is not.