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首页> 外文期刊>Tropical Animal Health and Production >Population genetic structure and maternal lineage of South African crossbred Nguni cattle using the cytochrome b gene in mtDNA
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Population genetic structure and maternal lineage of South African crossbred Nguni cattle using the cytochrome b gene in mtDNA

机译：南非人口遗传结构和南非跨跨越牛肝菌牛的遗传结构，MTDNA细胞色素B基因

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摘要

The Nguni cattle breed predominates South Africa and is endowed with traits favourable against environmental stressors such as heat stress and resistance to diseases. Interventions to improve production have led to the erosion of the genetic integrity of local breeds and the introduction of exotic breeds has proved ineffective as they fail to perform well due to different climatic conditions and production systems. In this study, the genetic structure and genetic lineage of Nguni crossbreds from 6 populations were assessed using the mitochondrial cytochrome b gene. Twelve polymorphic sites were detected resulting in 11 haplotypes with haplotype and nucleotide diversities of 0.550 +/- 0.135 and 0.0019 +/- 0.0011, respectively. Only 2 of the 6 populations displayed recent population expansion events, whereas the majority adhered to neutral evolution. The basal haplotype contained approximately 60% of the studied populations and there were four unique haplotypes that were revealed. A possible Nguni descript haplotype was uncovered, and this haplotype was found in all populations but was however devoid of individuals from around the world. The genetic structure of the populations was rather low (average pairwise F-ST = 0.066 and Slatkins F-ST = 0.094), and approximately 96% of the total genetic variation was accounted for by differences within populations. Phylogenetic analyses supported the clustering of all the samples within the Bos taurus clade and no Bos indicus haplotype was detected. Furthermore, no intermediate haplotype of taurine and indicine was detected. Overall, the maternal lineage of the crossbreds points to a taurine origin and the low genetic diversity depicts the retention of the Nguni genetic pool and possibly its superior adaptive traits.
机译：Nguni牛品种占据南非，并且赋予了有利于环境压力源的特征，如热应激和疾病的抗性。改善产量的干预导致了当地品种的遗传完整性的侵蚀，引入异国情调的品种，因为由于不同的气候条件和生产系统，它们未能表现良好。在本研究中，使用线粒体细胞色素B基因评估来自6种群体的NgUni杂交遗传结构和遗传谱系。检测到12位多态性位点，导致11个单倍型，单倍型和0.550 +/- 0.135和0.0019 +/- 0.0011的核苷酸多样性。只有2个人群中只有2个展示了最近的人口扩张事件，而大多数则遵守中性演变。基础单倍型含有大约60％的研究群体，并且有四种独特的单倍型被揭示。可能的NgUni描述了单倍型被发现，并且在所有人群中发现了这种单倍型，但无论是来自世界各地的个体。群体的遗传结构相当低（平均成对F-ST = 0.066和Slatkins F-ST = 0.094），并且群体内的差异占总遗传变异的约96％。系统发育分析支持Bos Taurus Clade内所有样品的聚类，并且没有检测到Bos indecus单倍型。此外，检测到牛磺酸的中间单倍型并检测到。总体而言，杂交的母体谱系指向牛磺酸源性，低遗传多样性描述了尼加西遗传泳池的保留以及可能其优越的适应性性状。

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