在操作背景下,DNA混合物对混合物比较的价值
Patrick Basset1, Louanne Toulemont1, Tacha Hicks1
1Unit of Forensic Genetics, University Center of Legal Medicine, Lausanne - Geneva, Lausanne University Hospital and University of Lausanne, Chemin de la Vulliette 4, Lausanne 25 CH - 1000, Switzerland.
Forensic science international. Genetics
|August 4, 2024
概括
现在可以分析以前从国家数据库中排除的法医DNA混合物. 这项研究表明,这些复杂的DNA档案可以帮助警方识别潜在的犯罪系列,改善调查.
科学领域:
- 法医科学 法医科学 法医科学
- 遗传学 遗传学 是一个
- 刑事司法 刑事司法 刑事司法
背景情况:
- 国家法医DNA数据库历来排除了具有>2个贡献者或不足的基点来防止错误的线索的复杂DNA档案 (混合物).
- 可解释的DNA混合物,包括西瑞士约10%的分析痕迹,由于数据库的局限性,通常不会在全国范围内进行比较.
- 目前的做法很少利用DNA混合物进行序列检测,尽管它们具有潜在的调查价值.
研究的目的:
- 评估概率基因型软件 (STRmix v2.7) 的实用性,用于比较不适合国家数据库搜索的DNA混合物.
- 评估使用混合对混合比较来识别共同贡献者和潜在犯罪系列的潜力.
- 为了确定非CODIS可加载DNA混合物的调查价值,用于执法.
主要方法:
- 利用STRmix v2.7的混合到混合工具来比较来自六个警察部门收集的潜在系列的235个DNA档案.
- 进行了27,495次对对比,分析了基于1000的概率比率 (LR) 的结果.
- 与警方定义的调查期望相关联的确定的关联 (预期,可能,意想不到).
主要成果:
- 88对 (0.3%) 的DNA档案显示出潜在的共同贡献者 (LR ≥1000).
- 其中,68.2%被警方归类为"预期"的协会,表明有效的调查线索.
- 该研究表明,使用复杂的DNA混合物来发现潜在的序列的可行性,即使它们不能上传到国家数据库.
结论:
- 非CODIS可加载的DNA混合物,当使用先进的软件进行分析时,可以为识别潜在的犯罪系列提供有价值的情报.
- 这种方法通过利用以前未充分利用的DNA证据,提高了地方和国家层面的调查能力.
- 进一步考虑局限性,如偶然的关联和成本效益,是必要的,以充分融入调查过程.
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