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A Large-Scale Genome-Wide Association Study in U.S. Holstein Cattle
Jicai Jiang1, Li Ma1, Dzianis Prakapenka2
1Department of Animal and Avian Sciences, University of Maryland, College Park, MD, United States.
Frontiers in Genetics
|May 30, 2019
Summary
This large-scale genome-wide association study in Holstein cows identified new genetic effects for production and fertility traits. Key genes and regions were pinpointed, including DGAT1, offering insights into dairy cattle breeding.
Area of Science:
- Animal Genetics
- Quantitative Genetics
- Genomic Epidemiology
Background:
- Genome-wide association studies (GWAS) are crucial for identifying genetic variants linked to complex traits in livestock.
- Limited cross-study validation exists for GWAS findings in dairy cattle.
- Understanding genetic architecture of production, fertility, and health traits is vital for breeding programs.
Purpose of the Study:
- To conduct a large-scale GWAS in Holstein cows to identify novel additive and dominance genetic effects.
- To pinpoint specific genomic regions and genes influencing production traits, fertility, and somatic cell score.
- To investigate the nature of allelic effects and pleiotropy, particularly for the DGAT1 gene.
Main Methods:
- A genome-wide association study was performed on 294,079 first-lactation Holstein cows.
- Analysis included additive and dominance genetic effects for production, fertility, and somatic cell score.
- Statistical methods were employed to identify significant single nucleotide polymorphism (SNP) effects and analyze allelic patterns.
Main Results:
- New additive and dominance effects were identified for five production traits, three fertility traits, and somatic cell score.
- Significant SNP effects were located on multiple chromosomes, with notable regions on Chr14 (DGAT1), Chr06 (GC, SLC4A4, etc.), Chr20 (C6, GHR), and Chr05.
- The DGAT1 gene region on Chr14 showed antagonistic pleiotropy, affecting fat yield positively while negatively impacting milk and protein yields.
Conclusions:
- This study significantly expands the understanding of genetic control for key dairy traits in Holstein cattle.
- Identified genetic regions and variants provide valuable targets for marker-assisted selection in breeding programs.
- The findings highlight the complex genetic architecture and pleiotropic effects influencing dairy performance and health.
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