人口基层结构影响了中国多民族地区的亲属测试
Yuhan Hu1, Xuan Dai1, Haoyu Wang1
1West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Ren Min Nan Road 3-17, P.O.Box: 610041, Chengdu, P. R. China.
International journal of legal medicine
|September 9, 2025
概括
种群亚结构显著影响遗传关系测试. 使用特定人群的频率和FST校正对于准确的亲属分析至关重要,特别是在孤立的群体中,以避免高估相关性.
科学领域:
- 法医科学 法医科学 法医科学
- 人口遗传学 人口遗传学
- 遗传学 是一个遗传学.
背景情况:
- 概率比 (LR) 对于评估关系测试中的遗传证据至关重要.
- LR计算依赖于人口频率,这些频率容易受到人口亚结构的影响.
- 了解基层结构的影响对于准确的法医遗传分析至关重要.
研究的目的:
- 调查人口亚结构对中国人口概率比率计算的影响.
- 使用不同的频率数据集和FST校正方法来比较LR结果.
- 确定跨不同族群关系测试的最佳策略.
主要方法:
- 利用来自13个中国人群的18个短串重复 (STR) 位置数据.
- 使用特定种群和国家等位基频率计算LRs.
- 应用于国家频率的FST校正 (全国整体和人口特异性).
- 使用截止和比较方法比较LR值.
主要成果:
- 国家等位基因频率产生了最大的LR,可能高估了相关性.
- FST校正降低了LR值,导致了更保守的关系推断.
- 在使用整体国家FST时,对于孤立的少数群体来说,FST校正不足.
- 大多数和一些少数群体的人群显示FST校正的影响最小.
结论:
- 对于具有高FST值的孤立子群体,群体特异频率和更高的FST值 (0.03-0.05) 确保准确,保守的相关性推断.
- 没有FST校正的国家频率足以在较少的基层结构群体中进行关系测试.
- 根据特定人群量身定制频率数据和校正方法,增强了法医遗传学分析.
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