Copy number variations are primary source of genetic variations, which are associated with essential traits in many organisms. During recent years, there have been numerous research works that reveal functions of CNV. However, these studies provide only several references about copy number variations in the sheep genome. In this study, we examined the copy number variation of the gene in three Chinese sheep breeds (Chaka sheep, Hu sheep, Small-tailed Han sheep) and performed correlation analysis with growth traits, to detect the influence of CNVs. TOP2B copy numbers were divided into three distribution groups (gain, median, loss) in three Chinese sheep breeds. The distribution amount of copy number 2 of CNVs was dominant in all sheep breeds. The statistical analysis showed that CNV had a significant effect on body length in CK sheep ( 0.05), and effects on chest circumference, canon circumference ( < 0.05) in HU sheep. CNVs in STH sheep breed were relevant to chest circumference and height of hip cross ( < 0.05). These results confirmed the relationship between CNV of TOP2B gene and growth traits in three sheep breeds, and provide a reliable reference for sheep breeding.
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| http://dx.doi.org/10.1080/10495398.2020.1773490 | DOI Listing |
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