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Across all 40 645 SNPs, the correlations between ASEs estimated within each of the breeds varied from −0.02 to 0.04, indicating that models developed to predict genomic breeding values within one breed will have very low accuracies in other breeds.
"Just as people vary in their problem-solving abilities, so do dogs, even within one breed," lead researcher Rosalind Arden, of the London School of Economics, said in a release.
Our results suggest that a significant proportion of QTL segregate only within one breed or the other.
There are obvious issues (e.g., pedigree structure, pedigree size, etc) in comparisons between studies analyzing estimations of heritability within one breed.
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Although there is substantial variation in expression within the replicates of one breed, the heat map suggests clearly that the selected differential gene set associates the biological samples correctly into two groups each representing one breed.
However, the use of G D led to a major decrease in accuracy when selecting bulls of one breed based on cows of another breed as can be seen in the average negative accuracy of 0. Also, negative estimates of bias were obtained when using G D in across-breed predictions, either within-sex (Table 6) or across sexes (Table 8).
A number of peaks were characterized with more than one breed specific peak in the within-breed analyses, supporting a commonality of selective pressure in at least a few regions in some breeds.
Moreover, we detected six genes strongly associated with known QTL for beef or dairy traits (TG, ABCG2, DGAT1, GH1, GHR and the Casein Cluster) within selection signatures of at least one breed.
As explained by Daetwyler et al. [ 2], a QTL with a large effect and a low allele frequency in one breed can be imprecisely estimated within that breed.
Figure 1 illustrates three potential hybridization scenarios within a single probe set: 1) mRNA to target probes is not expressed in either breed, 2) mRNA to target probes is equivalent in both breeds or, 3) intensity of a probe(s) within a set is expressed at a high level in one breed and negligible in the other breed.
This approach is based on the fact that local positive selection tends to reduce the heterozygosity of specific loci in a population by increasing the frequency of one allele in one breed, which results in a higher proportion of between-breed than within-breed genetic variation [ 10].
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Justyna Jupowicz-Kozak
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