对NGS-STR的法医利用和对不同亲属身份识别的系统有效性的评估
Hui Xu1, Hongbing Yao2, Xi Yuan1
1Guangzhou Key Laboratory of Forensic Multi-Omics for Precision Identification, School of Forensic Medicine, Southern Medical University, Guangzhou, 510515, Guangdong, China.
Human genomics
|December 24, 2025
概括
结合短串联重复 (STR) 长度和序列变化,可以提高法医科学中复杂的亲属关系识别准确度. 这种增强的方法为挑战家庭关系分析提供了更大的歧视力.
科学领域:
- 法医遗传学 法医遗传学
- 人口遗传学 人口遗传学
背景情况:
- 传统的亲属识别依赖于短串重复 (STR) 长度多态,通常不足以复杂的关系.
- 下一代测序 (NGS) 允许在STR中检测基序列多态性,但其法医应用需要评估.
- 这项研究评估了52个STR的疗效,分析了复杂的亲属关系识别的长度和序列变化.
研究的目的:
- 为了评估一个放大系统的法医应用价值,使用52个STR进行复杂的亲属分析.
- 调查STR中长度和序列多态的联合潜力,用于法医识别.
- 评估系统在区分不同程度的亲属关系方面的有效性.
主要方法:
- 在52个STR位点中分析遗传多态性,重点关注长度和序列变化.
- 模拟 1000 个亲属对和 1000 个不相关的个体对,使用等位基频率.
- 使用概率比率 (LR) 和状态相同 (IBS) 方法对亲属关系表现的评估.
主要成果:
- 序列多态数据显著增加了STR遗传多态性,与单独的长度相比,等位基因数增加了61%.
- 52个STR系统在完整的兄弟姐妹和不相关的个人中实现了99.85%的疗效.
- 对于半兄弟姐妹,祖父母-孙子和叔叔-子的有效率约为61%.
结论:
- 结合STR长度和序列多态度,可以提高亲缘关系识别的有效性.
- 开发的系统为法医实践中复杂的亲属身份识别提供了有价值的工具.
- 未来的研究应该验证值并扩展STR位点以检测远距离关系.
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