关于在小鼠中识别生长的遗传参数,这些小鼠具有非常深的足位
概括
遗传模型中的高共同祖先可以对遗传参数的估计产生偏见. 这项研究表明,父母之间的亲密关系会导致标准误差增加,并影响估计直接和母性遗传影响的准确性.
科学领域:
- 定量遗传学 是一种定量遗传学.
- 动物繁殖 动物繁殖
- 统计遗传学 统计遗传学
背景情况:
- 在具有直接和母性遗传影响的模型中估计遗传共变参数可能是由于数据结构而具有挑战性的.
- 缺乏观测和高共同祖先是已知的影响参数识别和准确性的问题.
- 亲密关系和高共同祖先对遗传参数估计的影响尚未得到充分探索.
研究的目的:
- 调查高共同祖先对遗传 (共同) 变异的实际识别能力的影响.
- 分析基因参数估计的偏差和精度,以深度血统的小鼠线.
- 在遗传共变性模型中量化接近结构性不可识别性的程度.
主要方法:
- 在33年的时间里,对两种未经选择的小鼠线的生长特征 (体重) 的遗传统计分析.
- 在三个发育阶段对大约115,000个体重观察结果进行了分析.
- 使用原始血统结构进行模拟,以评估估计的偏差和精度.
主要成果:
- 单变量分析显示,对身体质量特征的直接和母性影响之间的遗传相关性主要是积极的.
- 多变量分析表明相关性更强,标志不变.
- 模拟显示,直接与母亲的遗传相关性存在上升偏差,特别是在更高的真相关性时.
- 结构性不可识别的指标接近统一 (>.998),特别是在后代更高的内生和共同祖先的后代.
结论:
- 父母之间强烈的共同祖先是一个重要的数据结构特征,可以导致估计遗传参数中的偏见和膨胀的标准错误.
- 纳入直接和母性遗传影响的模型容易受到这些问题的影响,影响遗传参数估计的准确性.
- 需要进一步的研究来开发能够考虑高共同祖先的方法,以提高遗传评估的可靠性.
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