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基于线粒体基因组评估清远麻鸡保种资源遗传多样性

Genetic Diversity of Qingyuan Partridge Chickens Based on Mitochondrial Genome

  • 摘要: 清远麻鸡(Qingyuan partridge chicken)是我国著名的优质地方鸡(Gallus gallus gallus)品种之一,已经历了20年系统地保种和利用,但其核心原种保种群体始终缺乏遗传多样性评价。本研究通过对国家级清远麻鸡原种保种场的选育群和保种群进行高通量测序,获得了清远麻鸡核心原种保种群体的99个线粒体基因组。在此基础上,本研究对清远麻鸡的线粒体基因组遗传多样性水平进行了全面评估,发现其线粒体基因组遗传多样性较高,编码基因COⅠ、ND4、COⅢ、ND2和Cytb及所有非编码基因的平均核苷酸差异数(K)均处于较高水平,说明清远麻鸡保种效果良好。比较分析保种群和选育群的遗传分化,结果表明保种群线粒体基因组遗传多样性高于选育群的,除了ND1和COⅡ单倍型多样度(Hd)低于选育群的外,保种群其余基因的单倍型多样度(Hd)均高于选育群的。通过两群体线粒体基因组编码区序列比对,发现选育群中共有30个错义突变位点,包括分别发生在ND3和ND5基因的2个激进变异;保种群有24个错义突变位点,包括COⅢ的1个中度激进突变和ND3的1个激进突变,提示清远麻鸡具有较大的选育潜力。本研究的结果对于清远麻鸡遗传资源的保护和评价,以及合理的开发和利用提供了理论参考。

     

    Abstract: Qingyuan partridge chicken, as one of the famous native chicken(Gallus gallus gallus) breeds in China, has undergone systematical conservation and utilization for 20 years, nevertheless its core conservation population lacks genetic diversity evaluation. In this study, a total of 99 mitochondrial genome from the breeding population and conservation population of Qingyuan partridge chickens were determined by high-throughput sequencing. On this basis, this study conducted a comprehensive evaluation on the genetic diversity level of the mitochondrial genome of Qingyuan partridge chicken. It was found that the genetic diversity of its mitochondrial genome was relatively high. All non-coding genes as well as coding genes including COⅠ, ND4, COⅢ, ND2 and Cytb had high level of ave-rage number of nucleotide differences(K), indicating that Qingyuan partridge chicken had a good effect on breed conservation. The results also showed that the conservation population had higher genetic diversity than breeding populations. Meanwhile, conservation population had higher gene haplotype diversity(Hd) than breeding populations for all coding genes except for ND1 and COⅡ. The sequence alignment results of mitochondrial genome coding regions between two populations showed that, a total of 30 missense mutations were identified among the breeding populations, including two radical mutations in ND3 and ND5 genes, respectively, while a total of 24 missense mutations happened among the conservation population, including one moderate radical mutation in COⅢ and one radical mutation in ND3, suggesting that Qingyuan partridge chicken had great breeding potential. In summary, this study provided a theoretical reference for the protection, evaluation and rational utilization of Qingyuan partridge chickens.

     

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