Mitochondrial DNA diversity,origin, and phylogenic relationships of three Chinese large-fat-tailed sheep breeds |
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| Authors: | Email author" target="_blank">Yongju?ZhaoEmail author Erhu?Zhao Nanyang?Zhang Chaowei?Duan |
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| Institution: | (1) College of Animal Science and Technology, Chongqing Key Laboratory of Forage and Herbivore, Southwest University, Beibei, Chongqing, 400716, China |
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| Abstract: | China is abundant of sheep genetic resources. A total of 55 sequences containing the Ovis aries mtDNA D-loop of three large-fat-tailed sheep breeds, named Lanzhou, Tong, and Han were retrieved from GenBank to investigate their
genetic diversity, origin, and phylogenetic evolution. The results showed that the sheep breeds in our study proved to be
extremely diverse, the average haplotype diversity and nucleotide diversity were 0.987 ± 0.006 and 0.03956 ± 0.00206, respectively.
The 55 sequences gave 39 different haplotypes. Phylogenetic analyses revealed that there were three distinct mtDNA haplogroups:
A, B, and C, in which haplogroup A was predominant and had experienced population expansion events. Clustering analysis showed
that the large-fat-tailed sheep breeds clustered into one group and were closely related to the Mongolian sheep and then European
mouflon sheep (Ovis musimon). The results contribute to the knowledge of Chinese sheep breeds and the plan of conservation programs on large-fat-tailed
sheep. |
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