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Made available in DSpace on 2020-12-12T02:24:51Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-12-01
Highlighting genomic profiles for geographically distinct subpopulations of the same breed may provide insights into adaptation mechanisms to different environments, reveal genomic regions divergently selected, and offer initial guidance to joint genomic analysis. Here, we characterized similarities and differences between the genomic patterns of Angus subpopulations, born and raised in Canada (N = 382) and Brazil (N = 566). Furthermore, we systematically scanned for selection signatures based on the detection of autozygosity islands common between the two subpopulations, and signals of divergent selection, via FST and varLD tests. The principal component analysis revealed a sub-structure with a close connection between the two subpopulations. The averages of genomic relationships, inbreeding coefficients, and linkage disequilibrium at varying genomic distances were rather similar across them, suggesting non-accentuated differences in overall genomic diversity. Autozygosity islands revealed selection signatures common to both subpopulations at chromosomes 13 (63.77–65.25 Mb) and 14 (22.81–23.57 Mb), which are notably known regions affecting growth traits. Nevertheless, further autozygosity islands along with FST and varLD tests unravel particular sites with accentuated population subdivision at BTAs 7 and 18 overlapping with known QTL and candidate genes of reproductive performance, thermoregulation, and resistance to infectious diseases. Our findings indicate overall genomic similarity between Angus subpopulations, with noticeable signals of divergent selection in genomic regions associated with the adaptation in different environments.
Department of Animal Science School of Agricultural and Veterinarian Science São Paulo State University (UNESP)
Department of Animal Nutrition and Production School of Veterinary Medicine and Animal Science (FMVZ) University of Sao Paulo (USP)
Department of Agricultural Food and Nutritional Science Faculty of Agricultural Life & Environmental Sciences University of Alberta
Lacombe Research and Development Centre Agriculture and Agri-Food Canada
Embrapa Pecuária Sudeste
CSIRO Agriculture & Food, 306 Carmody Rd., St. Lucia
National Council for Science and Technological Development
Centre for Genetic Improvement of Livestock Department of Animal Biosciences University of Guelph
Department of Animal Science School of Agricultural and Veterinarian Science São Paulo State University (UNESP)
