| Designation | ISBT name | Cluster | Haplotype | Mechanism | Alterations | First mention | Definitive publication |
| CO(A168T) | main cluster | Colton | Single missense mutation | 502G>A (A168T) | 2009 | ||
| CO(V50M) | main cluster | Colton | Single missense mutation | c.148G>A (Val50Met) | 2015 |