遗传 ›› 2020, Vol. 42 ›› Issue (3): 296-308.doi: 10.16288/j.yczz.19-252

• 研究报告 • 上一篇    下一篇

74-plex SNPs复合检测体系在中国人群中的族群推断研究

刘杨1,2, 孙昌春1,2, 马咪2,3, 王玲2, 赵雯婷2, 马泉2, 季安全2, 刘京2(), 李彩霞1,2()   

  1. 1. 山西医科大学,太原 036000
    2. 公安部物证鉴定中心,法医遗传学公安部重点实验室,现场物证溯源技术国家工程实验室,北京 100038
    3. 新疆生产建设兵团第七师公安局,奎屯 833200
  • 收稿日期:2019-11-13 修回日期:2020-01-13 出版日期:2020-03-20 发布日期:2020-01-17
  • 通讯作者: 刘京,李彩霞 E-mail:biojing@yeah.net;licaixia@tsinghua.org.cn
  • 作者简介:刘杨,硕士研究生,研究方向:法医学。E-mail: 1979227825@qq.com
  • 基金资助:
    国家自然科学基金项目编号(81772027);国家重点研发计划资编号(2017YFC0803501);国家科技资源共享服务平台计划项目编号(YCZYPT[2017]01-3);中央公益类基本科研业务费专项资金项目资助编号(2017JB025);中央公益类基本科研业务费专项资金项目资助编号(2017JB026);中央公益类基本科研业务费专项资金项目资助编号(2019JB011)

The ancestry inference of Chinese populations using 74-plex SNPs system

Yang Liu1,2, Changchun Sun1,2, Mi Ma2,3, Ling Wang2, Wenting Zhao2, Quan Ma2, Anquan Ji2, Jing Liu2(), Caixia Li1,2()   

  1. 1. Shanxi Medical University, Taiyuan 036000, China
    2. Key Laboratory of Forensic Genetics, Beijing Engineering Research Center of Crime Scene Evidence Examination, National Engineering Laboratory for Forensic Science, Institute of Forensic Science, Beijing 100038, China
    3. Production and Construction Corps of Seventh Division Public Security Bureau, Kuitun 833200, China
  • Received:2019-11-13 Revised:2020-01-13 Online:2020-03-20 Published:2020-01-17
  • Contact: Liu Jing,Li Caixia E-mail:biojing@yeah.net;licaixia@tsinghua.org.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China No(81772027);National Key R&D Program of China No(2017YFC0803501);National Science and Technology Resources Sharing Service Platform Project No(YCZYPT[2017]01-3);Fundamental Research Funds for Institute of Forensic Science Nos(2017JB025);Fundamental Research Funds for Institute of Forensic Science Nos(2017JB026);Fundamental Research Funds for Institute of Forensic Science Nos(2019JB011)

摘要:

使用一组祖源SNP可以分析某人群的遗传成分,推断某个体的族群来源。本课题组前期筛选出74个SNP位点实现了撒哈拉以南的非洲、北非、欧洲、美洲、大洋洲、南亚、西南亚、东亚、东北亚和东南亚等10个地理区域人群的推断,并基于MassARRAY质谱分析技术构建了74-plex SNPs复合检测体系。本研究利用该体系对14个中国人群1371份样本进行基因分型,验证评估该体系对中国人群的区分能力和法医学应用效能。首先,基于全球57个人群3628份个体构建参考人群分型库,采用Structure分析和等位基因频率热图等方法进行人群区分能力评估;然后,选取千人基因组计划中3个人群(不包含在参考人群分型库中)及本实验室检测的14个人群共计1654个体作为测试数据集,通过似然比和族群成分等统计分析,评估该体系对实际样本的族群来源推断能力。结果表明,DNA的量最低为1.5 ng时,74个SNP均可正确判型,适用于微量检材的检测;该体系对全球10个地理区域人群有区分能力,针对测试人群中欧洲、美洲、南部非洲个体族群来源推断的准确率为95.4%、不排除率为1.06%,东亚个体推断的准确率为71.0%、不排除率为17.9%,东南亚个体推断的准确率66.4%、不排除率为 33.3%。该方法可以为实际案件侦察提供线索。

关键词: 法医遗传学, 祖源SNP, 族群推断, 中国人群

Abstract:

A panel of ancestry informative SNPs (AISNPs) can be used to analyze the genetic components of a population and infer the ancestral origin of a DNA sample. Previously, we have selected a 74-AISNPs panel and used it to infer the ancestry of unknown individuals in the following ten geographical regions: Sub-Saharan Africa, North Africa, Europe, Pacific, Americas, Southwest Asia, South Asia, North Asia, East Asia and Southeast Asia. We have also established a 74-plex SNPs assay based on SEQUENOM system. In the present study, we genotyped 1371 individuals from 14 populations of China using this multiplex assay, and validated its ability to infer the ancestry in Chinese populations. Firstly, based on the reference database of 3628 individuals from 57 world populations, Structure and Heatmap were employed to evaluate the population differentiation capacity. The training data include 1654 individuals from 14 Chinese populations and 3 populations from 1K Genome, which are not included in the reference database. Then the likelihood ratio and ancestry components were analyzed for individual ancestry assignment using the 74-plex SNPs. The minimum amount of DNA required for a full genotype of the 74 SNPs is 1.5 ng, which is applicable for forensic analysis. The results demonstrate that this system can be used in differentiating the population from ten geographical regions. The ancestry inference accuracy for EUR/SAFR/AME population is 95.4%, 71.0% for East Asia and 66.4% for Southeast Asia respectively. The ancestry inference inclusive rate for EUR/SAFR/AME population is 1.06%, 17.9% for East Asia and 33.3% for Southeast Asia respectively. The results suggest that this method can be used in forensic investigations of criminal cases.

Key words: forensic genetics, AISNPs, ancestry inference, Chinese populations