Genetic and phylogenetic studies of Chinese native sheep breeds (Ovis aries) based on mtDNA D-loop sequences |
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| Affiliation: | 1. College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi 712100, China;2. Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100094, China;3. Institute of Cellular and Molecular Biology, Xuzhou Normal University, Xuzhou, Jiangsu 221116, China;1. Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium;2. Inria Lille, 40, avenue Halley, 59650 Villeneuve d׳Ascq, France;1. Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, Hubei 430074, PR China;2. College of Science, Jiujiang University, Jiujiang 332005, PR China;3. School of Mechanical and Materials Engineering, Jiujiang University, Jiujiang 332005, PR China;1. N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospekt 47, 119991, Moscow, Russia;2. D.K. Zabolotny Insitute of Microbiology and Virology, National Academy of Sciences, ul. Zabolotnogo 154, 03143, Kiev, Ukraine;1. Department of Physics, Faculty of Science, Port Said University, Port Said, Egypt;2. Department of Physics, Faculty of Science for Girls, King Khalid University, Abha, Saudi Arabia |
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| Abstract: | To determine the genetic diversity and the origin of Chinese sheep, we analyzed 83 complete sequences of mtDNA D-loop from nine Chinese sheep breeds and a foreign breed, together with nine sheep and cattle available sequences from GenBank. The length of the sequences was considerably variable between 1103 and 1225 bp. The hapolotype diversity was 92.7%. The nucleotide diversity was 3.058%. And the mean nucleotide composition of the 83 sequences was 32.9% A, 29.8% T, 22.9% C and 14.4% G, respectively. The NJ phylogenetic tree (the number of replications of bootstrap test is 1000) revealed that there were three distinct major domestic sheep lineages (termed as lineages A–C) in the 10 breeds. The result indicated that Chinese native sheep breeds derive from three different maternal sources. The mismatch distribution analysis showed that the Fs values were −25.15, −12.28, −8.60 for the lineages A–C, respectively (P < 0.01), which suggested that atleast one population expansion events occur in the demographic history of Chinese sheep breeds. |
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