Table 2.
Comparison of autosomal aneuploidy types.
| Phenotype (n) | Aneuploidy type | Chromosome size (Mb) | Genes per chromosome | Maternal age (years) |
|---|---|---|---|---|
| EPL (1) | Trisomy 1 | 188.3 | 1683 | 4a |
| EPL (1) | Trisomy 3 | 121.4 | 883 | 6a |
| EPL (1) | Trisomy 15 | 92.9 | 664 | 19a |
| EPL (2) | Trisomy 20 | 65.3 | 738 | 13a and 19a |
| EPL (1*) | Trisomy 24 | 48.4 | 453 | 3a |
| EPL (1) | Monosomy 27 | 40.3 | 232 | 10a and 19a |
| EPL (2) | Monosomy 31 | 26 | 154 | 10a |
| EPL (1*), LB (1) | Trisomy 23 | 55.6 | 294 | 3a, #b |
| LB (1) | Trisomy 26 | 43.1 | 232 | 3c |
| LB (3) | Trisomy 27 | 40.3 | 232 | 5d, 26e, #f |
| LB (1) | Trisomy 28 | 47.3 | 388 | 14g |
| EPL (2), LB (2) | Trisomy 30 | 31.4 | 185 | 9a, 19a, and 23c |
| LB (1) | Trisomy 31 | 26 | 154 | 26h |
Those unique to our study were larger and contained more genes than those also reported in live born equines. Mares of a variety of ages were affected with an aneuploidy pregnancy. EPL early pregnancy loss, LB live born, *same conceptus trisomic for two different chromosomes, #unreported mare age.