NDLI: A genome scan for quantitative trait loci influencing carcass, post-natal growth and reproductive traits in commercial Angus cattle.

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A genome scan for quantitative trait loci influencing carcass, post-natal growth and reproductive traits in commercial Angus cattle.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	McClure, M. C. Morsci, N. S. Schnabel, R. D. Kim, J. W. Yao, P. Rolf, M. M. McKay, S. D. Gregg, S. J. Chapple, R. H. Northcutt, S. L. Taylor, J. F.
Description	Country affiliation: United States Author Affiliation: McClure MC ( Division of Animal Sciences, University of Missouri, Columbia, MO 65211, USA.)
Abstract	To gain insight into the number of loci of large effect that underlie variation in cattle, a quantitative trait locus (QTL) scan for 14 economically important traits was performed in two commercial Angus populations using 390 microsatellites, 11 single nucleotide polymorphisms (SNPs) and one duplication loci. The first population comprised 1769 registered Angus bulls born between 1955 and 2003, with Expected Progeny Differences computed by the American Angus Association. The second comprised 38 half-sib families containing 1622 steers with six post-natal growth and carcass phenotypes. Linkage analysis was performed by half-sib least squares regression with gridqtl or Bayesian Markov chain Monte Carlo analysis of complex pedigrees with loki. Of the 673 detected QTL, only 118 have previously been reported, reflecting both the conservative approach to QTL reporting in the literature, and the more liberal approach taken in this study. From 33 to 71% of the genetic variance and 35 to 56% of the phenotypic variance in each trait was explained by the detected QTL. To analyse the effects of 11 SNPs and one duplication locus within candidate genes on each trait, a single marker analysis was performed by fitting an additive allele substitution model in both mapping populations. There were 53 associations detected between the SNP/duplication loci and traits with -log(10) P(nominal) ≥ 4.0, where each association explained 0.92% to 4.4% of the genetic variance and 0.01% to 1.86% of the phenotypic variance. Of these associations, only six SNP/duplication loci were located within 8 cM of a QTL peak for the trait, with two being located at the QTL peak: SST_DG156121:c.362A>G for ribeye muscle area and TG_X05380:c.422C>T for calving ease. Strong associations between several SNP/duplication loci and trait variation were obtained in the absence of any detected linked QTL. However, we reject the causality of several commercialized DNA tests, including an association between TG_X05380:c.422C>T and marbling in Angus cattle.
File Format	HTM / HTML
ISSN	02689146
Issue Number	6
Volume Number	41
e-ISSN	13652052
Journal	Animal Genetics
Language	English
Publisher	Wiley-Blackwell
Publisher Date	2010-12-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Genetics Discipline Zoology Cattle Genome-wide Association Study Veterinary Microsatellite Repeats Genetics Quantitative Trait Loci Alleles Animals Bayes Theorem Body Composition Growth & Development Chromosome Mapping Genetic Linkage Genome Genotype Least-squares Analysis Phenotype Polymorphism, Single Nucleotide Journal Article Research Support, Non-u.s. Gov't Research Support, U.s. Gov't, Non-p.h.s.
Content Type	Text
Resource Type	Article
Subject	Genetics Medicine Animal Science and Zoology

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