The book of abstracts is available. - PoznaÅ
The book of abstracts is available. - PoznaÅ
The book of abstracts is available. - PoznaÅ
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14 th QTL-MAS Workshop, Poznań University <strong>of</strong> Life Sciences, Poland 2010Genome wide association study using single and multiple SNP analys<strong>is</strong>G.C.B. Schopen 1* , M.P.L. Calus 2 , M.H.P.M. V<strong>is</strong>ker 3 , J.A.M. van Arendonk 3 , H. Bovenhu<strong>is</strong> 31 Animal Breeding and Genomics Centre, Wageningen University and Research Centre, P.O. Box 338, 6700 AHWageningen, the Netherlands2 Animal Breeding and Genomics Centre, Wageningen UR Livestock Research, 8200 AB Lelystad, theNetherlands∗ Presenting author: Ghyslaine Schopen, email: Ghyslaine.Schopen@crv4all.comBackground. <strong>The</strong> objective <strong>of</strong> th<strong>is</strong> study was to compare the SNPs showing the mostsignificant effects, the location and the fraction <strong>of</strong> variance explained by these SNPs betweensingle SNP analys<strong>is</strong> and multiple SNP analys<strong>is</strong> in the Dutch Holstein-Friesian population. <strong>The</strong>compar<strong>is</strong>on was performed for the relative concentrations <strong>of</strong> the six major milk proteins. Intotal, 1713 cows with genotypes and phenotypes were <strong>available</strong>. In total, 45,999 SNPsd<strong>is</strong>tributed across 29 bovine autosomes were used in the single and multiple SNP analyses.Results. <strong>The</strong> same main four chromosomal regions on BTA5, 6, 11, and 14 were detected inthe single and multiple SNP analys<strong>is</strong>. <strong>The</strong> proportion <strong>of</strong> genetic variance explained by each <strong>of</strong>the SNPs in the single SNP analys<strong>is</strong> was higher compared to the SNP with the highestposterior probability in the multiple SNP analys<strong>is</strong>, except for β-casein. Summing up theproportion <strong>of</strong> genetic variance explained by adjacent SNPs next to the SNP with the highestposterior probability in the multiple SNP analys<strong>is</strong>, resulted in an increase <strong>of</strong> the geneticvariance explained similar to the SNP most significantly associated in the single SNPanalys<strong>is</strong>, except for β-casein. <strong>The</strong>re was one additional region on BTA7 detected in themultiple SNP analys<strong>is</strong>. <strong>The</strong> number <strong>of</strong> SNPs with effects <strong>is</strong> considerably lower in the multipleSNP analys<strong>is</strong> as compared to the single SNP analys<strong>is</strong>.Conclusions. Multiple SNP analys<strong>is</strong> result in higher power and in higher mapping prec<strong>is</strong>ionto detect QTL as compared to the single SNP analys<strong>is</strong>.24