title: A genome-wide approach to screen for genetic variants in broilers (Gallus gallus) with divergent feed conversion ratio.
abstract: Feed conversion ratio (FCR) is an economically important trait in broilers and feed accounts for a significant proportion of the costs involved in broiler production. To explore the contribution of functional variants to FCR trait, we analyzed coding and non-coding single-nucleotide variants (SNVs) across the genome by exome sequencing in seven pairs of full-sibs broilers with divergent FCR and with a sequence coverage at an average depth of fourfold. We identified 192,119 high-quality SNVs, including 30,380 coding SNVs (cSNVs) in the experimental population. We discovered missense SNVs in PGM2, NOX4, TGFBR3, and TMX4, and synonymous SNVs in TSNAX, ITA, HSP90B1, and COL18A1 associated with FCR. Haplotype analyses of genome-wide significant SNVs in PGM2, PHKG1, DGKZ, and SOD2 were also observed with suggestive evidence of haplotype association with FCR. Single-variant and FCR QTL-related genes-based association analyses of SNVs identified newly associated genes for FCR in the regions subjected to targeted exome sequencing. The top seven SNVs were next evaluated in independent replication data sets where SNV chr. 3: 13,990,160 (c. 961G>C) at TMX4 was replicated (p < 0.05). Collectively, we have detected SNVs associated with FCR in broiler as well as identification of SNVs in known FCR QTL region. These findings should facilitate the discovery of causative variants for FCR and contribute to marker-assisted selection.
authors.affiliation: Department of Animal Biotechnology, College of Veterinary Science and Animal Husbandry, Anand Agricultural University, Anand, 388 001, Gujarat, India.
authors.forename: Tejas M
authors.initials: TM
authors.lastname: Shah
authors.affiliation: Department of Animal Biotechnology, College of Veterinary Science and Animal Husbandry, Anand Agricultural University, Anand, 388 001, Gujarat, India.
authors.forename: Namrata V
authors.initials: NV
authors.lastname: Patel
authors.affiliation: Department of Animal Biotechnology, College of Veterinary Science and Animal Husbandry, Anand Agricultural University, Anand, 388 001, Gujarat, India.
authors.forename: Anand B
authors.initials: AB
authors.lastname: Patel
authors.affiliation: Department of Animal Biotechnology, College of Veterinary Science and Animal Husbandry, Anand Agricultural University, Anand, 388 001, Gujarat, India.
authors.forename: Maulik R
authors.initials: MR
authors.lastname: Upadhyay
authors.affiliation: Department of Animal Biotechnology, College of Veterinary Science and Animal Husbandry, Anand Agricultural University, Anand, 388 001, Gujarat, India.
authors.forename: Amitbikram
authors.initials: A
authors.lastname: Mohapatra
authors.affiliation: Marshall Breeder Pvt. Ltd., Nasik, 422 001, Maharashtra, India.
authors.forename: Krishna M
authors.initials: KM
authors.lastname: Singh
authors.affiliation: Marshall Breeder Pvt. Ltd., Nasik, 422 001, Maharashtra, India.
authors.forename: Sunil D
authors.initials: SD
authors.lastname: Deshpande
authors.affiliation: Department of Animal Biotechnology, College of Veterinary Science and Animal Husbandry, Anand Agricultural University, Anand, 388 001, Gujarat, India. cgjoshi@rediffmail.com.
authors.forename: Chaitanya G
authors.initials: CG
authors.lastname: Joshi
mesh_terms: D000818:Animals; D002645:Chickens / Q000235:genetics*; D014644:Genetic Variation; D055106:Genome-Wide Association Study; D006239:Haplotypes; D040641:Quantitative Trait Loci; D017422:Sequence Analysis, DNA / Q000379:methods
keywords: Broiler; Exome sequencing; Feed conversion ratio (FCR); Haplotype; Single-nucleotide variants (SNVs)