title: Genome-Wide Association Study for Carcass Traits in an Experimental Nelore Cattle Population.
abstract: The purpose of this study was to identify genomic regions associated with carcass traits in an experimental Nelore cattle population. The studied data set contained 2,306 ultrasound records for longissimus muscle area (LMA), 1,832 for backfat thickness (BF), and 1,830 for rump fat thickness (RF). A high-density SNP panel (BovineHD BeadChip assay 700k, Illumina Inc., San Diego, CA) was used for genotyping. After genomic data quality control, 437,197 SNPs from 761 animals were available, of which 721 had phenotypes for LMA, 669 for BF, and 718 for RF. The SNP solutions were estimated using a single-step genomic BLUP approach (ssGWAS), which calculated the variance for windows of 50 consecutive SNPs and the regions that accounted for more than 0.5% of the additive genetic variance were used to search for candidate genes. The results indicated that 12, 18, and 15 different windows were associated to LMA, BF, and RF, respectively. Confirming the polygenic nature of the studied traits, 43, 65, and 53 genes were found in those associated windows, respectively for LMA, BF, and RF. Among the candidate genes, some of them, which already had their functions associated with the expression of energy metabolism, were found associated with fat deposition in this study. In addition, ALKBH3 and HSD17B12 genes, which are related in fibroblast death and metabolism of steroids, were found associated with LMA. The results presented here should help to better understand the genetic and physiologic mechanism regulating the muscle tissue deposition and subcutaneous fat cover expression of Zebu animals. The identification of candidate genes should contribute for Zebu breeding programs in order to consider carcass traits as selection criteria in their genetic evaluation.
authors.affiliation: School of Agricultural and Veterinarian Sciences, FCAV/ UNESP-Sao Paulo State University, Department of Animal Science, Jaboticabal-SP, Brazil.
authors.forename: Rafael
authors.initials: R
authors.lastname: Medeiros de Oliveira Silva
authors.affiliation: School of Agricultural and Veterinarian Sciences, FCAV/ UNESP-Sao Paulo State University, Department of Animal Science, Jaboticabal-SP, Brazil.
authors.forename: Nedenia
authors.initials: N
authors.lastname: Bonvino Stafuzza
authors.affiliation: University of Georgia, Department of Animal and Dairy Science, Athens, GA, United States of America.
authors.forename: Breno
authors.initials: B
authors.lastname: de Oliveira Fragomeni
authors.affiliation: School of Agricultural and Veterinarian Sciences, FCAV/ UNESP-Sao Paulo State University, Department of Animal Science, Jaboticabal-SP, Brazil.
authors.forename: Gregório
authors.initials: G
authors.lastname: Miguel Ferreira de Camargo
authors.affiliation: APTA Center of Beef Cattle, Animal Science Institute, Sertaozinho, SP, Brazil.
authors.forename: Thaís
authors.initials: T
authors.lastname: Matos Ceacero
authors.affiliation: APTA Center of Beef Cattle, Animal Science Institute, Sertaozinho, SP, Brazil.
authors.forename: Joslaine
authors.initials: J
authors.lastname: Noely Dos Santos Gonçalves Cyrillo
authors.affiliation: School of Agricultural and Veterinarian Sciences, FCAV/ UNESP-Sao Paulo State University, Department of Animal Science, Jaboticabal-SP, Brazil.
authors.forename: Fernando
authors.initials: F
authors.lastname: Baldi
authors.affiliation: Department of Animal Science, Federal University of Pelotas, Pelotas, RS, Brazil.
authors.forename: Arione
authors.initials: A
authors.lastname: Augusti Boligon
authors.affiliation: APTA Center of Beef Cattle, Animal Science Institute, Sertaozinho, SP, Brazil.
authors.forename: Maria Eugênia
authors.initials: ME
authors.lastname: Zerlotti Mercadante
authors.affiliation: University of Georgia, Department of Animal and Dairy Science, Athens, GA, United States of America.
authors.forename: Daniela
authors.initials: D
authors.lastname: Lino Lourenco
authors.affiliation: University of Georgia, Department of Animal and Dairy Science, Athens, GA, United States of America.
authors.forename: Ignacy
authors.initials: I
authors.lastname: Misztal
authors.affiliation: School of Agricultural and Veterinarian Sciences, FCAV/ UNESP-Sao Paulo State University, Department of Animal Science, Jaboticabal-SP, Brazil.
authors.forename: Lucia
authors.initials: L
authors.lastname: Galvão de Albuquerque
mesh_terms: D000222:Adaptation, Physiological / Q000235:genetics; D000822:Animal Husbandry; D000818:Animals; D001823:Body Composition / Q000235:genetics*; D001947:Breeding; D002417:Cattle / Q000033:anatomy & histology / Q000235:genetics*; D004734:Energy Metabolism / Q000235:genetics; D056726:Genetic Association Studies; D055106:Genome-Wide Association Study; D008460:Meat / Q000032:analysis*; D020412:Multifactorial Inheritance; D064170:Paraspinal Muscles; D020641:Polymorphism, Single Nucleotide; D050151:Subcutaneous Fat / Q000033:anatomy & histology; D014329:Tropical Climate