2007 Paul VanRaden 1, Jeff O’Connell 2, George Wiggans 1, Kent Weigel 3 1 Animal Improvement Programs Lab, USDA, Beltsville, MD, USA 2 University of Maryland.

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2007 Paul VanRaden 1, Jeff O’Connell 2, George Wiggans 1, Kent Weigel 3 1 Animal Improvement Programs Lab, USDA, Beltsville, MD, USA 2 University of Maryland School of Medicine, Baltimore, MD, USA 3 University of Wisconsin Dept. Dairy Science, Madison, WI, USA 2010 Combining Different Marker Densities in Genomic Evaluation Combining Different Marker Densities in Genomic Evaluation

Interbull meeting, Riga, Latvia May 2010 (2)Paul VanRaden 2010 Topics  Filling missing SNPs (imputation) Find haplotypes from genotypes Use lower density to track higher Programs implemented April 2010  Actual mixes of 3K with 50K  Simulated mixes of 50K with 500K  Calculating reliabilities

Interbull meeting, Riga, Latvia May 2010 (3)Paul VanRaden 2010 Mixing Different Chips

Interbull meeting, Riga, Latvia May 2010 (4)Paul VanRaden 2010 What is imputation?  Genotypes indicate how many copies of each allele were inherited  Haplotypes indicate which alleles are on which chromosome  Use observed genotypes to impute unknown haplotypes Pedigree haplotyping uses relatives Population haplotyping finds matching allele patterns

Interbull meeting, Riga, Latvia May 2010 (5)Paul VanRaden 2010 Why impute haplotypes?  Predict unknown SNP from known Measure 3,000, predict 50,000 SNP Measure 50,000, predict 500,000 Measure each haplotype at highest density only a few times  Predict dam from progeny SNP  Increase reliabilities for less cost

Interbull meeting, Riga, Latvia May 2010 (6)Paul VanRaden 2010 Haplotyping Program findhap.f90  Begin with population haplotyping Divide chromosomes into segments, ~250 SNP / segment List haplotypes by genotype match Similar to FastPhase, IMPUTE  End with pedigree haplotyping Detect crossover, fix noninheritance Impute nongenotyped ancestors

Interbull meeting, Riga, Latvia May 2010 (7)Paul VanRaden 2010 Recent Program Revisions  Imputation and GEBV reliability are better than in 9WCGALP paper  Changes since January 2010 Use known haplotype if second is unknown Use current instead of base frequency Combine parent haplotypes if crossover is detected Begin search with parent or grandparent haplotypes

Interbull meeting, Riga, Latvia May 2010 (8)Paul VanRaden 2010 Most Frequent Haplotypes 5.16% % % % % % % % % % Most frequent haplotype in first segment of chromosome 15 for Holsteins had 4,316 copies = 41,822 * 2 *.0516

Interbull meeting, Riga, Latvia May 2010 (9)Paul VanRaden 2010 Example Bull: O-Style USA , Sire = O-Man  Read genotypes, write haplotypes

Interbull meeting, Riga, Latvia May 2010 (10)Paul VanRaden 2010 Find Haplotypes – AB coding Genotypes: Oman BB,AA,AA,AB,AA,AB,AB,AA,AA,AB Ostyle BB,AA,AA,AB,AB,AA,AA,AA,AA,AB Haplotypes: OStyle (pat) B A A _ A A A A A _ OStyle (mat) B A A _ B A A A A _

Interbull meeting, Riga, Latvia May 2010 (11)Paul VanRaden 2010 Find Haplotypes – 0,1,2 coding Genotypes: codes 0 = BB, 1 = AB or BA, 2 = AA Oman Ostyle Haplotypes: codes 0 = B, 1 = unknown, 2 = A OStyle (pat) OStyle (mat)

Interbull meeting, Riga, Latvia May 2010 (12)Paul VanRaden 2010 O-Style Haplotypes chromosome 15

Interbull meeting, Riga, Latvia May 2010 (13)Paul VanRaden 2010 How does imputation work?  Identify haplotypes in population using many markers  Track haplotypes with fewer markers  e.g., use 5 SNP to track 25 SNP 5 SNP: SNP:

Interbull meeting, Riga, Latvia May 2010 (14)Paul VanRaden 2010 Imputed Dams  If progeny and sire both genotyped First progeny inherits 1 of dam’s 2 haplotypes Second progeny has 50:50 chance to get same or other haplotype Haplotypes known with 1, 2, 3, etc. progeny are ~50%, 75%, 87%, etc.

Interbull meeting, Riga, Latvia May 2010 (15)Paul VanRaden 2010 Better Communication is Needed  “Progeny genotypes should affect dam, but programs are not yet available” Jan 2009 USDA Changes Memo  “Programs are available to impute 1300 dams” Oct 2009 USDA report to Council  “Encourage USDA to use genotypes, derived by imputation, in genetic evaluation” Oct 2009 Holstein USA Board of Directors (in Holstein Pulse)

Interbull meeting, Riga, Latvia May 2010 (16)Paul VanRaden 2010 Haplotyping Tests – Real Data  Half of young animals assigned 3K Proven bulls, cows all had 50K Dams imputed using 50K and 3K  Half of ALL animals assigned 3K Could 3K reference animals help? 10,000 proven bulls yet to genotype Should cows with 3K be predictors?

Interbull meeting, Riga, Latvia May 2010 (17)Paul VanRaden 2010 Correlations 2 of 3K and PA with 50K Half of YOUNG animals had 3K PTA, half 50K PTA TraitCorr(3K,50K) 2 Corr(PA,50K) 2 Gain NM$ % Milk % Fat % Prot % PL % SCS % DPR %

Interbull meeting, Riga, Latvia May 2010 (18)Paul VanRaden 2010 Using 3K as Reference Genotypes Half of ALL animal NM$ were from 3K, half 50K Using 3K as Reference Genotypes Half of ALL animal NM$ were from 3K, half 50K REL Gain as compared to all 50K Breed50K prog3K progImputed dams HO90%73%36% JE82%56%44% BS84%72%55%

Interbull meeting, Riga, Latvia May 2010 (19)Paul VanRaden 2010 Simulated 500K Genotypes  Linkage in base population Similar to actual linkage reported by: – De Roos et al, 2008 Genetics 179:1503 – Villa-Angulo et al, 2009 BMC Genetics 10:19 Underlying linkage corresponds to D’  Three subsets of mixed 50K and 500K: Of 33,414, only 1,586 (young) had 500K Also bulls > 99% REL, total 3,726 Also bulls > 90% REL, total 7,398

Interbull meeting, Riga, Latvia May 2010 (20)Paul VanRaden 2010 Results from 500K Simulation DensitySingleMixedSingle Chips50K50K and 500K500K MissingN = 01,5863,7267,39833,414 Before1%88%80%70%1% After.05%5.3%2.3%1.5%.05% REL

Interbull meeting, Riga, Latvia May 2010 (21)Paul VanRaden 2010 REL Using Only 3K, 50K, or 500K with increasing numbers of bulls

Interbull meeting, Riga, Latvia May 2010 (22)Paul VanRaden 2010 Conclusions  Genomic evaluations can mix different chip densities to save $ (or € or ¥) New programs implemented in April 2010  Only a few thousand of highest density genotypes needed, and other animals imputed  More animals can be genotyped to increase selection differential and size of reference population

Interbull meeting, Riga, Latvia May 2010 (23)Paul VanRaden 2010 Acknowledgments  Curt Van Tassell of BFGL selected the 3,209 low density SNP  Bob Schnabel of U. Missouri fixed map locations for several SNP  Mel Tooker assisted with computation