TABLE 2.
Gene numbers, linkage, and gene arrangement of MHC-I and MHC-II genes in passerine birds (TGS-based genomes).
| Species | Number of gene copies | Number of MHC-I and IIB related clusters | Gene linkage (whether in the same contig) | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| TAP1 | TAP2 | IIA | COL11A2 | MHC-I contigs | MHC-IIB contigs | TAP1-TAP2 linkage | MHC-I and TAPs linkage | Existence of MHC-I and IIB linkage | MHC-IIA and IIB linkage | |
| Acanthisitta chloris | 1 | 1 | 1 | 1 | 1 | 1 | N | N | N | Y |
| Catharus ustulatus | 1 | 1 | 1 | — | 1 | 2 | Y | N | Y (1) a | N |
| Chiroxiphia lanceolate | 1 | 1 | — | 1 | 2 | 2 | Y | N | Y (1) | — |
| Corvus hawaiiensis | 1 | 1 | 1 | 1 | 4 | 5 | Y | N | N | Y |
| Corvus moneduloides | 1 | 1 | — | 1 | 1 | 1 | Y | N | N | — |
| Eopsaltria australis | 1 | — | 1 | 1 | 4 | 24 | — | N | Y (3) | N |
| Geothlypis trichas | 1 | 1 | 1 | 1 | 2 | 3 | Y | N | Y (2) | Y |
| Hirundo rustica | 1 | 1 | — | 1 | 3 | 6 | Y | N | Y (3) | — |
| Manacus vitellinus | 1 | 1 | 1 | 1 | 20 | 135 | Y | N | Y (5) | N |
| Pipra filicauda | 1 | 1 | 1 | 1 | 13 | 34 | Y | N | Y (2) | N |
| Sporophila hypoxantha | 3 b | 1 | 1 | 1 | 1 | 1 | Y b | N | N | N |
| Sylvia atricapilla | 1 | 1 | — | 1 | 2 | 2 | N | N | N | — |
| Taeniopygia guttata | — | 1 | — | 1 | 1 | 3 | — | Y (>700 kb) | N | — |
a
Note:The numbers in brackets suggested the numbers of contigs having both MHC-I and MHC-IIB genes.
b
Only one linked TAP1-TAP2 pair found, despite three TAP1 in Sporophila hypoxantha.