Mitochondrial DNA diversity and origins of South and Central American goats
Mitochondrial DNA diversity and origins of South and Central American goats
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DOI：
10.1111/j.1365-2052.2008.01837.x
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发表时间：
2009-06-01
期刊：
影响因子：
2.4
通讯作者：
Capote, J.
中科院分区：
文献类型：
--
作者：
Amills, M.;Ramirez, O.;Capote, J.
我们分析了南美洲和中美洲（SCA）山羊的遗传多样性，通过对93个具有广泛地理分布的个体的线粒体控制区进行部分测序。核苷酸和单倍型差异分别达到0.020 +/- 0.00081和0.963 +/- 0.0012。我们还观察到一个相当弱的地理结构，几乎69%的遗传变异包括在品种内方差分量。包括286个欧洲，伊比利亚，大西洋和SCA线粒体序列的中位数连接网络分析的拓扑结构是非常复杂的，与大多数的单倍型形成独立的小集群的一部分。SCA序列在整个网络中呈分散分布，与西班牙语和葡萄牙语序列的聚类仅偶尔发生，无法区分明确的伊比利亚签名。相反，我们发现了一个突出的集群，包括加那利群岛，智利，阿根廷和玻利维亚的线粒体单倍型。通过构建贝叶斯系统发育树（后验概率为0.97）独立证实了这一结果。SCA和加那利山羊的线粒体单倍型的共享表明，来自大西洋群岛的山羊种群参与了SCA山羊品种的建立，西班牙和葡萄牙的船只在前往新大陆的途中曾在那里装载食物和物资。
We have analysed the genetic diversity of South and Central American (SCA) goats by partially sequencing the mitochondrial control region of 93 individuals with a wide geographical distribution. Nucleotide and haplotype diversities reached values of 0.020 +/- 0.00081 and 0.963 +/- 0.0012 respectively. We have also observed a rather weak phylogeographic structure, with almost 69% of genetic variation included in the within-breed variance component. The topology of a median-joining network analysis including 286 European, Iberian, Atlantic and SCA mitochondrial sequences was very complex, with most of the haplotypes forming part of independent small clusters. SCA sequences showed a scattered distribution throughout the network, and clustering with Spanish and Portuguese sequences occurred only occasionally, not allowing the distinguishing of a clear Iberian signature. Conversely, we found a prominent cluster including Canarian, Chilean, Argentinian and Bolivian mitochondrial haplotypes. This result was independently confirmed by constructing a Bayesian phylogenetic tree (posterior probability of 0.97). Sharing of mitochondrial haplotypes by SCA and Canarian goats suggests that goat populations from the Atlantic archipelagos, where Spanish and Portuguese ships en route to the New World used to stow food and supplies, participated in the foundation of SCA caprine breeds.