U.S. Meat Animal Research Center (MARC)
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Transcript U.S. Meat Animal Research Center (MARC)
Coming soon to a genetics lab near you!
Marker adjusted EPDs
NBCEC Beef Genetic Workshop
Clay Center, NE
March 27, 2004
Cattle genes affecting carcass traits
Thyroglobulin- marbling
(Gene Star)
Calpastatin- tenderness
(Gene Star)
Calpain- tenderness
(MARC)
Leptin- fat deposition
DGAT- milk fat and protein
Current limitations in genomic research
Single gene selection is worse than single trait
selection
Need to incorporate with EPDs
We need to rapidly identify sufficient number
of genes that explain the majority of the
genetic variation
Need for additional laboratory tools
Additional laboratory tools
Large expensive projects - require international
collaborations
Cattle physical (BAC) map
10 labs from US, Canada, UK, France, Brazil,
New Zealand, Australia
Complete in Summer 2004
Mapping a trait to a gene
Ultimate physical map
Sequence the cow genome
Funding from NHGRI; USDA; Texas; Genome
Canada; New Zealand; Australia; National, Texas
and South Dakota Beef Council; UK; and Norway $54+ million (6X coverage, 10K full length genes,
SNPs)
Started Feb 2004- complete 2006?
How do we identify more genes faster?
BAC map and genome sequence will help fine map
QTL
Need more QTL populations to identify more genes
and for more traits
SNP map will be used to develop low cost, high
throughput genome scans
Use industry populations?
Implementation of Marker Adjusted
EPDs
Develop haplotyped markers
TGGCAC
AGGCTC
TGCTTG
TGGCTC
TGCCTC
TGCTTC
TACTTC
Implementation of Marker Adjusted
EPDs
Develop haplotyped markers
TGGCAC
AGGCTC
10%
14%
TGCTTG
TGGCTC
TGCCTC
25%
17%
21%
Functional alleles
TGCTTC
1) AGCTC, TGCAC, TGCTC
1%
2) TGCTC, TGTTC, TGTTG, TATTC
TACTTC
12%
Implementation of Marker Adjusted
EPDs
Validate/replicate and estimate effect (different genetics
and environment)
Evaluate interaction of different markers for the same trait
Evaluate effect upon additional traits
Selection pressure for each gene based upon effect of allele
substitution, gene interaction, effects on different traits,
and breeding objectives
Need some continual phenotyping to estimate effect
Genes affecting additional traits
Carcass traits- marbling , tenderness
Growth – bend growth curve
Milk production- composition
Feed efficiency – expensive to measure
Reproduction- dissect components
Twinning population
Health traits - difficult to measure
Utilize genetic diversity- crossbreeding
Additional uses for DNA markers
Parentage
Verification system for animal identification
Same markers used for parentage and animal ID
Government subsidize genotyping
Who maintains database and has access???
Added value with animal records
MARC’s role in advancing cattle genomics
BAC map, genome sequence, pedigree populations
Identify additional markers, QTLs (publicly available)
Develop haplotype system
Provide GPE cycle 7 as a validating population
Published or patent submitted
Not for product development
Work with NBCEC to incorporate
DNA markers with EPDs