基因参数,线性关联和全基因组关联研究,用于Holstein公牛的内毒素诱导的皮质醇反应
Bruno A Galindo1,2, Umesh K Shandilya1, Ankita Sharma1
1Department of Animal Biosciences, University of Guelph, Guelph, ON N1G 2W1, Canada.
Animals : an open access journal from MDPI
|July 12, 2025
概括
在荷尔斯坦公牛中,皮质醇应激反应对脂聚糖化物 (LPS) 的挑战是适度遗传的. 这种反应显示出与关键生产和健康特征的弱但显著的关联,与已识别的候选基因和QTLs.
科学领域:
- 动物遗传学和动物基因组学
- 免疫学 免疫学 免疫学
- 兽医医学 兽医医学 兽医医学
背景情况:
- 脂聚糖 (LPS) 是格拉姆阴性细菌的关键成分,已知可触发炎症反应和压力,包括公牛的皮质醇水平升高.
- 了解皮质醇对LPS反应的遗传基础对于改善牛的健康和生产率至关重要,因为它与各种生产和健康特征有关.
研究的目的:
- 为了估计血清皮质醇对霍尔斯坦公牛的LPS挑战的基因参数.
- 调查皮质醇反应与生产,健康,繁殖和形状特征之间的线性关联.
- 进行全基因组关联研究 (GWAS),以确定与皮质醇反应相关的遗传区域.
主要方法:
- 在LPS挑战后,评估了252只荷尔斯坦公牛的皮质醇反应.
- 使用剩余最大概率 (REML) 估计的遗传参数和遗传性.
- 执行了42123个SNP标记器的单阶段全基因组关联研究 (ssGWAS),以确定重要的基因组区域和候选基因.
主要成果:
- 皮质醇反应表现出中度遗传性 (0.26 ±0.19) 和显著的附加遗传变异.
- 与包括囊性卵巢,哺乳持续性,牛奶产量和蛋白质产量在内的特征发现了弱但显著的线性关联.
- 确定了34个基因组窗口,75个QTL和11个候选基因 (例如, *CFH*, *CDH2*, *CCL20*) 与皮质醇反应相关,在补体系统和EMT中可能发挥作用.
结论:
- 对于荷尔斯坦公牛的LPS挑战,皮质醇反应是一种适度遗传的特征,对生产和健康有影响.
- 已识别的候选基因和QTLs为改善牛的应激弹性和整体健康提供了遗传标.
- 建议使用更大的数据集进行进一步的研究,以验证这些遗传发现.
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