Fecha/hora: 16/06/2024 01:41:04

Biblioteca(s): 	INIA Las Brujas.	
Fecha corriente: 	29/09/2014	
Fecha de la última actualización: 	15/10/2019	
Autoria: 	WANG, H.; MISZTAL, I.; AGUILAR, I.; LEGARRA, A.; MUIR, W.M.	
Afiliación: 	IGNACIO AGUILAR GARCIA, Instituto Nacional de Investigación Agropecuaria (INIA), Uruguay.	
Título: 	Genome-wide association mapping including phenotypes from relatives without genotypes.	
Año de publicación: 	2012	
Fuente/Imprenta: 	Genetics Research, 2012, v.94, no.2, p.73-83. OPEN ACCESS.	
ISSN: 	0016-6723	
DOI: 	10.1017/S0016672312000274	
Idioma: 	Inglés	
Notas: 	Article history: Received 19 September 2011 / Revised 8 December 2011 and 9 March 2012. / Accepted 13 March 2012.	
Contenido: 	ABSTRACT.

A common problem for genome-wide association analysis (GWAS) is lack of power for detection of quantitative trait loci (QTLs) and precision for fine mapping. Here, we present a statistical method, termed single-step GBLUP (ssGBLUP), which increases both power and precision without increasing genotyping costs by taking advantage of phenotypes from other related and unrelated subjects. The procedure achieves these goals by blending traditional pedigree relationships with those derived from genetic markers, and by conversion of estimated breeding values (EBVs) to marker effects and weights. Additionally, the application of mixed model approaches allow for both simple and complex analyses that involve multiple traits and confounding factors, such as environmental, epigenetic or maternal environmental effects. Efficiency of the method was examined using simulations with 15 800 subjects, of which 1500 were genotyped. Thirty QTLs were simulated across genome and assumed heritability was 05. Comparisons included ssGBLUP applied directly to phenotypes, BayesB and classical GWAS (CGWAS) with deregressed proofs. An average accuracy of prediction 089 was obtained by ssGBLUP after one iteration, which was 001 higher than by BayesB. Power and precision for GWAS applications were evaluated by the correlation between true QTL effects and the sum of m adjacent single nucleotide polymorphism (SNP) effects. The highest correlations were 082 and 074 for ssGBLUP and CGWAS with m=8, and 083 for BayesB with m=16. Standard deviations of the correlations across replicates were several times higher in BayesB than in ssGBLUP. The ssGBLUP method with marker weights is faster, more accurate and easier to implement for GWAS applications without computing pseudo-data. 
© Cambridge University Press 2012.	
Thesagro: 	ANIMALES; CRIA; FENOTIPOS; GENOTIPO; MARCADORES GENÉTICOS; MEJORAMIENTO GENÉTICO ANIMAL.	
Categoría del tema: 	L10 Genética y mejoramiento animal	
URL: 	http://www.ainfo.inia.uy/digital/bitstream/item/3348/1/Aguilar-I.-2012.-Genet.Res.Camb.-v.942-p.73-83.pdf	
Registro original: 	INIA Las Brujas (LB)	
Ejemplares: 	LB - (100121-1) - PXI - AP - DD - PP/GENET.RESEARCH/2012 -  -  - DIS