Population genetics reveals new introgression in the nucleus herd of min pigs

文献类型： 外文期刊

第一作者： Liu, Tianxin

作者： Liu, Tianxin;Ji, Dongqing;Li, Xinyuan;Liu, Jiadong;Xu, Fei;Miao, Zhiying;Chang, Yang;Xu, Chunzhu;Tian, Ming

作者机构：

关键词： Min pigs; Genetic structure; Introgression; Microsatellite loci; D-loop; Y chromosome

期刊名称：GENES & GENOMICS （ 影响因子：2.1； 五年影响因子：1.9 ）

ISSN： 1976-9571

年卷期： 2024 年 46 卷 4 期

页码：

收录情况： SCI

摘要： ObjectiveMin pigs are a unique genetic resource among local pig breeds in China. They have more excellent characteristics in cold and stress resistance, good meat quality, and a high reproductive rate. However, the genetic structure and driving factors remain unclear in the nucleus herd. In this study, the genetic diversity of Min pigs was studied to reveal the formation mechanism of its unique genetic structure. We hope to protect and develop the genetic resources of Min pigs.MethodsWe analyzed different types of genes to identify the genetic structure and gene introgression pattern of Min pigs. The nuclear DNA dataset includes information on 21 microsatellite loci and 6 Y-chromosome genes, and the mitochondrial D-loop gene is selected to represent maternal lineages. The above genes are all from the nucleus herd of Min pigs.ResultsThe results of genetic structure identification and analysis of potential exogenous gene introgression patterns indicate that the nucleus herd of Min pigs maintains a high level of genetic diversity (polymorphism information content = 0.713, expected heterozygosity = 0.662, observed heterozygosity = 0.612). Compared with other Asian pig breeds, the formation of Min pig breeds is more special. Gene introgression from European pig breeds to Min pigs has occurred, which is characterized by complete introgression of paternal genes and incomplete introgression of maternal genes.ConclusionGene introgression caused by cross-breeding is not the main factor leading to the formation of the current genetic structure of Min pigs, but this process has increased the level of genetic diversity in the nucleus herd. Compared with the influence of gene introgression, our research suggest that artificial selection and environmental adaptive evolution make Min pigs form unique genetic characteristics.

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