多基因风险预测:为什么以及何时样本外预测R2可以超过基于SNP的遗传性
Xiaotong Wang1, Alicia Walker1, Joana A Revez1
1Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, Australia.
American journal of human genetics
|June 28, 2023
概括
多基因分数 (PGS) R平方可以超过基于SNP的遗传性 (hSNP2) 由于队列异质. 这项研究解释了这种情况发生的时间和原因,为改善遗传预测中的多队列分析提供了洞察力.
科学领域:
- 遗传学和基因组学 在
- 统计遗传学 统计遗传学
- 生物信息学是一种生物信息学.
背景情况:
- 多基因分数 (PGS) 分析使用确定系数 (R2) 来评估预测有效性.
- 基于SNP的遗传性 (hSNP2) 是外样本PGS R2的理论最大值.
- 观察到的PGS R2值有时超过SNP,并且SNP估计随着更多的元分析队列而下降.
研究的目的:
- 量化出外样本PGS R2的原因和条件可以超过hSNP2的数量.
- 为了解释hSNP2估计的下降,随着meta-analyzed队列数量的增加.
- 为理解基因分析中的队列间异质性提供理论框架.
主要方法:
- 使用理论推导和模拟来分析PGS R2和SNP.
- 研究了导致hSNP2降低的条件,并增加了队列元分析.
- 用于验证的是来自严重抑郁症 (二进制特征) 和教育成就 (连续特征) 的现实数据.
主要成果:
- 在队列特定的hSNP2或少于一个原因的遗传相关性的异质性hSNP2估计随着更多的队列而减少.
- 我们得出了条件,预计样本外预测R2大于hSNP2.
- 通过使用真正的遗传数据来验证主要抑郁症和教育成就的理论衍生.
结论:
- 队列间的异质性是解释PGS R和SNP之间的差异的一个关键因素.
- 由于未解决的异质性,现有的整合多队列数据的方法可能不足.
- 需要进一步的研究,以开发改进的方法,在遗传研究中集成多队列数据.
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