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Single-cell transcriptomic analyses of dairy cattle ruminal epithelial cells during weaning
Yahui Gao1, Lingzhao Fang2, Ransom L Baldwin3
1Animal Genomics and Improvement Laboratory, BARC, USDA-ARS, Beltsville, MD 20705, USA; Department of Animal and Avian Sciences, University of Maryland, College Park, MD 20742, USA.
Genomics
|May 2, 2021
Summary
This study maps cattle ruminal epithelial cell types using single-cell RNA sequencing. Researchers identified cell development during weaning and linked cell markers to important animal production traits.
Area of Science:
- Animal Science
- Genomics
- Cell Biology
Background:
- The rumen's epithelial tissue is crucial for nutrient absorption and animal health.
- Understanding cell development and function in the rumen is vital for improving cattle production.
- Previous studies lacked single-cell resolution for bovine ruminal epithelium.
Purpose of the Study:
- To characterize cell types and developmental trajectories of Holstein calf ruminal epithelium before and after weaning.
- To identify marker genes associated with ruminal epithelial cell types.
- To explore the genetic basis of production and conformation traits by integrating single-cell data with GWAS.
Main Methods:
- Single-cell RNA sequencing (scRNA-seq) on 6436 ruminal epithelial cells from Holstein calves.
- Bioinformatic analyses including cell clustering, marker gene identification, cell cycle, pseudotime, regulatory network, WGCNA, and Gene Ontology analyses.
- Integration of scRNA-seq data with Holstein Genome-Wide Association Study (GWAS) signals.
Main Results:
- Six distinct cell clusters were identified and annotated with specific cell types and marker genes.
- Cellular development and differentiation pathways within the ruminal epithelium during weaning were elucidated.
- Marker genes were significantly enriched for animal production and body conformation traits.
- Comparative analysis confirmed cell identities with human and mouse stomach epithelial cells.
Conclusions:
- This study provides the first single-cell transcriptomic atlas of cattle ruminal epithelium.
- It reveals key cell types and developmental dynamics during the critical weaning period.
- The findings link ruminal epithelial cell function to economically important traits, offering new avenues for genetic improvement in cattle.
