Genetic characterization of southwestern European bovine breeds:: A historical and biogeographical reassessment with a set of 16 microsatellites
Genetic characterization of southwestern European bovine breeds:: A historical and biogeographical reassessment with a set of 16 microsatellites
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DOI：
10.1093/jhered/esg055
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发表时间：
2003-05-01
影响因子：
3.1
通讯作者：
Cañon, J
中科院分区：
文献类型：
--
作者：
Beja-Pereira, A;Alexandrino, P;Cañon, J
一些作者认为伊比利亚牛的起源是过去几千年欧洲和北非牛进入的产物。然而，这些假设主要基于形态相似性。这项研究分析了来自 15 个伊比利亚代表性品种和 3 个法国品种的 889 个无关个体的 16 个微卫星位点。统计检验用于计算群体间遗传距离（D-A）和主成分分析（PCA）。为了可视化伊比利亚牛品种之间遗传分化的地理分布，使用 PCA 分析的数据构建合成图谱。相邻伊比利亚品种之间的遗传相似性主要是由基因流动引起的。然而，阿利斯塔纳、米兰德萨和图丹卡最近的人口波动和生殖隔离增加了遗传漂变，这可能是这些种群分化程度较高的主要原因。用第一和第二个 PC 构建的合成地图揭示了（1）北伊比利亚品种之间的巨大差异，而不是地理上距离较远的品种之间的差异，以及（2）明显的东西梯度，可能与农业的流行扩散模型有关。最后，我们没有发现强有力的证据表明非洲遗传对本研究分析的伊比利亚牛品种有影响。
The origin of Iberian cattle has been suggested by some authors to be the product of European and north African cattle entrances during the last few thousands of years. However, these hypotheses were mainly based on morphological similarities. This study analyzed 889 unrelated individuals from 15 representative Iberian breeds and 3 French breeds for 16 microsatellite loci. Statistical tests were used to calculate interpopulation genetic distances (D-A) and principal components analysis (PCA). To visualize the geographical distribution of the genetic differentiation between Iberian cattle breeds, data from the PCA analysis were used to construct synthetic maps. Genetic similarity among neighboring Iberian breeds is mainly caused by gene flow. However, recent demographic fluctuations and reproductive isolation in Alistana, Mirandesa, and Tudanca has increased genetic drift, which may be the main cause for the relatively high differentiation of these populations. The synthetic maps constructed with the first and second PCs revealed (1) a large differentiation between Northern Iberian breeds rather than between more geographically distant breeds, and (2) a clear east-west gradient that may be related with the model of demic diffusion of agriculture. Finally, we detected no strong evidence for an African genetic influence in the Iberian cattle breeds analyzed in this study.