在商业猪中优化基因组预测准确性的比较研究
Xiaojian Chen1,2, Yiyi Liu1,3, Yuling Zhang1,3
1National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, China.
Animals : an open access journal from MDPI
|April 12, 2025
概括
基因组预测 (GP) 模型,如ssGBLUP,提高了养猪特征的准确性. 优化标记密度和交叉验证可以提高牲畜的遗传进步.
科学领域:
- 动物遗传学动物遗传学
- 量化遗传学 量化遗传学
- 畜牧养殖 畜牧养殖 畜牧养殖
背景情况:
- 基因组预测 (GP) 对于加速畜牧和植物育种中的遗传收益至关重要.
- 医生准确度受到统计模型,标记密度和交叉验证方法的影响.
- 优化GP对于商业猪种群的经济重要特征至关重要.
研究的目的:
- 评估和优化Duroc × (Landrace × 约克郡) 猪群中八个关键尸体和身体特征的基因组预测准确度.
- 为了比较各种统计模型的性能,包括GBLUP,ssGBLUP和贝叶斯方法.
- 评估标记密度和交叉验证策略对预测准确性的影响.
主要方法:
- 使用了50K个SNP芯片数据,从1494只DLY猪中归算为全基因组序列 (WGS) 级别.
- 对比了七种不同的基因组预测模型:GBLUP,ssGBLUP和五种贝叶斯模型.
- 采用了不同数量的折叠的交叉验证策略,并分析了不同的标记密度.
主要成果:
- 在所有评估的特征中,ssGBLUP模型表现出卓越的性能,预测准确度在0.371到0.502.2之间.
- 预测准确度随着越来越高的交叉验证折叠和标记密度而增加,特别是在低密度面板中.
- 对于中高密度标记面板的预测准确度,观察到回报率下降.
结论:
- ssGBLUP模型在DLY猪中对尸体和身体特征的基因组预测方面非常有效.
- 统计模型,标记密度和交叉验证的战略选择对于最大限度地提高GP准确性至关重要.
- 这些发现为提高商业养猪计划的遗传进步提供了宝贵的指导.
相关概念视频
Improving Translational Accuracy
Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
Improving Translational Accuracy
Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...


