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Comprehensive analyses of 723 transcriptomes enhance genetic and biological interpretations for complex traits in cattle.

G. E. Liu

Events

06-24-2020

Abstract:

359
Comprehensive analyses of 723 transcriptomes enhance genetic and biological interpretations for complex traits in cattle.
G. E. Liu*. Animal Genomics and Improvement Laboratory, USDA-ARS Beltsville, MD.

To systemically establish connections at RNA level between tissue/cell types and complex traits in cattle, we uniformly analyzed 723 RNA-seq data from 91 tissues and cell types. We built a comprehensive gene atlas and studied tissue specificity of genes. We demonstrated that tissue-specific genes significantly reflected the tissue-relevant biology, showing distinct promoter methylation and evolution pattern (e.g., brain-specific genes evolve slowest, while testis-specific genes evolve fastest). Through integrative analyses of those tissue-specific genes with large-scale genome-wide association studies, we detected relevant tissues/cell types and candidate genes for 45 economically important traits in cattle, including blood/immune system (e.g., CCDC88C) for male fertility, brain (e.g., TRIM46 and RAB6A) for milk production, and multiple growth-related tissues (e.g., FGF6 and CCND2) for body conformation. We validated these findings by using epigenomic data across major somatic tissues and sperm. Collectively, our findings provided novel insights into the genetic and biological mechanisms underlying complex traits in cattle, and our transcriptome atlas can serve as a primary source for biological interpretation, functional validation, studies of adaptive evolution, and genomic improvement in livestock.

Keywords: cattle gene atlas, GWAS, RNA-seq.

Biography: I have been a Research Biologist (Bioinformatics) from USDA, ARS since 2005. My research interest is in comparative and functional genomic research related to animal health and agriculture production using bioinformatics and experimental techniques.