Analysis of the genetic diversity and the phylogenetic evolution of Chinese sheep based on Cyt b gene sequences
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Published on: August 14, 2018
Xin Wang1, Yue-Hui Ma, Hong Chen
1College of Animal Science and Technology, Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100, China.
Abstract:
The complete sequences of Cyt b gene from 20 individuals belonging to eight Chinese indigenous sheep breeds and one foreign breed were studied. The results showed that the hapolotype diversity of Chinese sheep breeds was 97.1%. The mean nucleotide composition of all the sequences was 27.1% T, 28.5% C, 31.4% A, and 13.0% G. The nucleotide diversity was 0.602%. A total of 43 mutation sites were detected, including 40 transitions and 3 transversions. Fu's test of selective neutrality showed that the sheep populations had no population demographic expansion (0.10 >P > 0.05). The different clustering methods, namely neighbor-joining, minimum evolution, and unweighted pair group method with arithmetic means, all showed a similar result, which indicated that Chinese local sheep had three maternal resources.
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