Genome-wide selection signatures analysis of litter size in Dazu black goats using single-nucleotide polymorphism

文献类型： 外文期刊

第一作者： E, Guang-Xin

作者： E, Guang-Xin;Duan, Xing-Hai;Zhang, Jia-Hua;Huang, Yong-Fu;Zhao, Yong-Ju;Na, Ri-Su;Zhao, Zhong-Quan;Han, Yan-Guo;Zeng, Yan;Ma, Yue-Hui;Chu, Ming-Xing;Basang, Wang-Dui;Zhu, Yan-Bin;An, Tian-Wu;Luo, Xiao-Lin

作者机构：

关键词： Goat; Litter size; Genome-wide sequence; SNP

期刊名称：3 BIOTECH （ 影响因子：2.406； 五年影响因子：3.203 ）

ISSN： 2190-572X

年卷期： 2019 年 9 卷 9 期

页码：

收录情况： SCI

摘要： Litter size is considered to be the most important index for estimating domestic animal productivity. The number of indigenous goats in China with higher litter sizes than those of commercial breeds in other countries may be helpful for accelerating genetic improvements in goat breeding. We performed a genome-wide selective sweep analysis of 31 Dazu black goats with extreme standard deviation in litter size within the third fetus to identify significant genomic regions and candidate genes through different analyses. The analysis identified a total of 33,917,703 variants, including 32,262,179 SNPs and 1,655,524 indels. In addition, two novel candidate genes (LRP1B and GLRB), which are related to litter size, were obtained with pi, Tajima's D, pi A/pi B, and F-ST at the individual level with a 95% threshold for each parameter. These two genes were annotated in five GO terms (localization, binding, macromolecular complex, membrane part, and membrane) and two pathways (long-term depression and neuroactive ligand-receptor interaction pathway). Regarding the result of linkage disequilibrium (LD) analysis, in LRP1B and GRID2, the high-yield Dazu black goats exhibit significantly different LD patterns from low-yield goats. Litter size variability has low heritability and is related to multiple complex factors found in domestic animals. Obtaining a clear explanation and significant signal by genome-wide selective sweep analysis with a small sample size is difficult. However, we investigated some candidate genes, particularly LRP1B and GLRB, which may provide useful information for further research.

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