Advancements in copy number variation screening in herbivorous livestock genomes and their association with phenotypic traits.
Authors: Liu Xiaotong, Chen Wenting, Huang Bingjian, Wang Xinrui, Peng Yongdong, Zhang Xinhao, Chai Wenqiong, Khan Muhammad Zahoor, Wang Changfa
Journal: Frontiers in veterinary science
Summary
Copy number variations (CNVs)—deletions, duplications, and other structural rearrangements of DNA segments—represent a significant source of genetic diversity in livestock genomes that can influence economically important traits, disease susceptibility, and environmental adaptation. Liu and colleagues conducted a comprehensive review of recent CNV research in herbivorous species (cattle, sheep, horses, and donkeys), synthesising current knowledge on detection methodologies, mutational mechanisms, and genotype-phenotype associations documented across the literature. The authors identified CNVs as major contributors to variation in growth characteristics, reproductive performance, coat colour, and disease resistance, demonstrating that these structural variants often explain phenotypic differences that traditional single nucleotide polymorphism (SNP) markers may miss. For equine and other livestock professionals engaged in selective breeding or clinical assessment, these findings underscore the value of incorporating CNV screening into genomic selection strategies alongside conventional molecular markers, potentially enhancing breeding accuracy and identifying animals with enhanced disease resilience or adaptive capacity. As microarray and sequencing technologies continue to mature, integrating CNV data into breeding programmes and individual health assessments offers a more comprehensive understanding of the genetic architecture underlying performance and health traits.
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Practical Takeaways
- •CNV screening can complement traditional breeding methods by identifying genetic markers associated with economically important traits (growth, reproduction, disease resistance) in your herd.
- •Modern DNA testing technologies now make CNV detection accessible for practical breeding decisions; consider genomic selection strategies alongside conventional phenotypic assessment.
- •Understanding CNV associations with disease resistance and environmental adaptation may help select breeding stock better suited to specific management conditions or health challenges.
Key Findings
- •Copy number variations (CNVs) are prevalent structural genetic variations found across herbivorous livestock genomes including cattle, sheep, horses, and donkeys.
- •CNVs demonstrate associations with phenotypic diversity, economic traits, disease resistance, and environmental adaptation in livestock.
- •Microarray and sequencing technologies have matured sufficiently to enable widespread CNV detection and analysis in livestock breeding programs.
- •CNVs show potential as molecular markers for genomic selection and breeding strategy improvement in herbivorous livestock production.