关于在Y-STR位点的多位基因删除和基因转换的案例报告
Xiaoting Mo1, Huijie Nie2, Yiyan Zhang3
1Key Laboratory of Forensic Genetics of Ministry of Public Security, Institute of Forensic Science, Ministry of Public Security, Beijing, 100038, China.
International journal of legal medicine
|October 1, 2025
概括
Y染色体短串重复 (Y-STRs) 突变,包括基因转换和删除,挑战了传统的法医模型. 先进的分析揭示了多副本位点的逐步突变模型的局限性,需要更新的法医方法.
科学领域:
- 法医遗传学 法医遗传学
- 人类遗传学 人类遗传学
- 分子生物学分子生物学
背景情况:
- Y染色体短串重复 (Y-STRs) 对于法医应用,如父权测试和血统追踪至关重要.
- 传统的突变模型,如步骤突变模型 (SMM),对于复杂的Y-STR突变,如基因删除和转换,尤其是多副本位置,是不够的.
研究的目的:
- 为了调查Y-STR突变异常,特别是基因转换和删除,在男性血统.
- 评估逐步突变模型 (SMM) 在分析多副本Y-STR位点方面的局限性.
- 突出了将非阶段性突变机制纳入法医Y-STR分析的必要性.
主要方法:
- 使用STR类型和下一代测序 (NGS) 技术.
- 来自五对父亲-儿子和父亲-表兄弟的基因型生物样本.
- 使用了YfilerTM白金套件,MicroreaderTM RM-Y ID套件和STRTyper Y68套件进行STR打字.
主要成果:
- 在一个案例中观察到多拷贝位点DYS385ab的基因转化突变.
- 在其他四个案例中检测到多个Y-STR位点 (DYS527ab,DYS387ab,DYF404S1,DYS464,DYS399S1,DYS626,DYS448) 的删除.
- 证明了SMM对于准确分析多副本Y-STR位址的不足.
结论:
- Y-STR突变动态比SMM所暗示的要复杂得多,涉及基因转换和删除.
- 目前的法医方法需要改进,以考虑多副本Y-STR位置的非阶段性突变事件.
- 这项研究为提高法医科学和人类遗传学的准确性提供了关键的见解.
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