2007 Melvin Tooker and Paul VanRaden Animal Improvement Programs Lab, USDA, Beltsville, MD, USA 2009 Happy Bulls, Happy Cows,

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2007 Melvin Tooker and Paul VanRaden Animal Improvement Programs Lab, USDA, Beltsville, MD, USA 2009 Happy Bulls, Happy Cows, Haplotypes

Council on Dairy Cattle Breeding, April 2010 (2)Melvin Tooker What is a Haplotype?  A group of alleles on a single chromosome that are closely linked usually inherited as a unit.

Council on Dairy Cattle Breeding, April 2010 (3)Melvin Tooker Chromosome to Nucleotide sequence

Council on Dairy Cattle Breeding, April 2010 (4)Melvin Tooker Example of a SNP haplotype caacgtat caacggat SNP atccgaat atccgcat … …… … SNP tctaggat tctcggat SNP … …Chr1 Chr2 Haplotype is a set of single nucleotide polymorphisms (SNPs) associated on a single chromosome. Identification of a few alleles of a haplotype block can identify other polymorphic sites in the region. Haplotype Atca gacHaplotype B

Council on Dairy Cattle Breeding, April 2010 (5)Melvin Tooker Example Bull: O-Style

Council on Dairy Cattle Breeding, April 2010 (6)Melvin Tooker Genotyped Ancestors of OStyle T B Elevat ElevationMagnet BovaChief CubbyValiantElevation Chief ManfredValiantRocket TeskP Iv Star ggdamBellMars Tony Ivanhoe O ManP Iv StarHeilo Bell BellChief EltonGlendellNeedle Glendell JezebelRotateP Comb’n MelwoodChief ggdamMarkBova

Council on Dairy Cattle Breeding, April 2010 (7)Melvin Tooker Genotyped Ancestors of OStyle Elevation StarbuckMajesty AerostarCitation RudolphMattadorValiant Cavalier TeamsterNed BoyChairman MascotTradition ggdamLeadmanMark Elevation DevaStarbuckChief PreludeChairman MtotoBlackstarMark Valiant DimaRoyaltyBell ComotionNed Boy ggdamMascotCleitus

Council on Dairy Cattle Breeding, April 2010 (8)Melvin Tooker O-Style Haplotypes chromosome 15

Council on Dairy Cattle Breeding, April 2010 (9)Melvin Tooker 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 _

Council on Dairy Cattle Breeding, April 2010 (10)Melvin Tooker 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)

Council on Dairy Cattle Breeding, April 2010 (11)Melvin Tooker Most Frequent Haplotypes 5.16% % % % % % % % % % Most frequent haplotype in first segment of chromosome 15 for Holsteins had 4,316 copies = 41,822 * 2 *.0516

Council on Dairy Cattle Breeding, April 2010 (12)Melvin Tooker 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.

Council on Dairy Cattle Breeding, April 2010 (13)Melvin Tooker Applications of Haplotyping  Imputation of non-genotyped parents  Fill in missing SNPs on genotyped animals by looking at relatives  Imputation of different size SNP chip sets: 3K to 50K