法医学杂志 ›› 2022, Vol. 38 ›› Issue (6): 709-718.DOI: 10.12116/j.issn.1004-5619.2021.511006

• 论著 • 上一篇    下一篇

唾液菌群的直接PCR扩增-高分辨率熔解曲线分析及其法医学应用

杨瑞(), 陈炯, 赵贵森()   

  1. 河南科技大学法医学院,河南 洛阳 471023
  • 收稿日期:2021-10-23 发布日期:2022-12-25 出版日期:2022-12-28
  • 通讯作者: 赵贵森
  • 作者简介:赵贵森,男,博士,副教授,硕士研究生导师,主要从事法医物证学研究;E-mail:lyfy@haust.edu.cn
    杨瑞(1995—),女,硕士研究生,主要从事法医物证学研究;E-mail:464549844@qq.com
  • 基金资助:
    国家自然科学基金资助项目(81501634)

Analysis of Salivary Bacterial Community by Direct PCR and High Resolution Melting Curve and Its Forensic Applications

Rui YANG(), Jiong CHEN, Gui-sen ZHAO()   

  1. School of Forensic Medicine, Henan University of Science and Technology, Luoyang 471023, Henan Province, China
  • Received:2021-10-23 Online:2022-12-25 Published:2022-12-28
  • Contact: Gui-sen ZHAO

摘要:

目的 建立一种基于直接PCR(direct PCR,dPCR)扩增和高分辨率熔解(high resolution melting,HRM)曲线分析的唾液菌群快速检测技术,评估其法医学应用价值。 方法 离心收集唾液中的细菌后重悬于Tris-EDTA(TE)缓冲液,直接作为模板用于16S rDNA V4区的扩增和HRM曲线分析,即dPCR-HRM,计算样本HRM图谱相对于参考图谱的判型置信度(genotype confidence percentage,GCP)。以传统的试剂盒(kit)提取模板DNA后再行PCR-HRM(即kPCR-HRM)为参考,验证dPCR-HRM的可行性。用dPCR-HRM法分析梯度稀释模板、群体样本和模拟唾液斑样本,评估其灵敏度、分型能力和检材适应性。 结果 dPCR-HRM法可在90 min内得到唾液菌群的HRM图谱,与kPCR-HRM法之间的GCP>95.85%。应用dPCR-HRM法,一般个体0.29 nL的唾液即可测得菌群HRM型。61例唾液样本可分为10种型,8 h之内的唾液斑与新鲜唾液分型相同(GCP>90.83%)。 结论 dPCR-HRM技术可用于唾液菌群的快速分型,且具有成本低、操作简单等优点。

关键词: 法医遗传学, 高分辨率熔解, 聚合酶链反应, 唾液, 菌群结构

Abstract:

Objective To develop a rapid test for salivary bacterial community based on direct PCR (dPCR) and high resolution melting (HRM) curve analysis, to evaluate its application value in forensic medicine. Methods The salivary bacteria were collected by centrifugation and then resuspended in Tris-EDTA (TE) buffer, and directly used as the template for amplification and HRM curve analysis (dPCR-HRM) of the 16S rDNA V4 region. The genotype confidence percentage (GCP) of the HRM profiles compared with the reference profile was calculated. The template DNA was extracted by traditional kit and then PCR-HRM (namely kPCR-HRM) was used as reference to validate the feasibility of dPCR-HRM. The gradient dilution templates, population samples and simulated salivary stains were analyzed by dPCR-HRM to evaluate its sensitivity, typing ability and adaptability. Results Using dPCR-HRM method, the HRM profiles of salivary bacterial community were obtained within 90 minutes. The GCP between dPCR-HRM and kPCR-HRM was greater than 95.85%. For general individuals, the HRM type of bacterial community could be determined with 0.29 nL saliva by dPCR-HRM. The 61 saliva samples could be divided into 10 types. The typing of salivary stains deposited within 8 h was the same as those of fresh saliva (GCP>90.83%). Conclusion dPCR-HRM technology can be used for rapid typing of salivary bacterial community, and has the advantage of low cost and simple operation.

Key words: forensic genetics, high resolution melting, polymerase chain reaction (PCR), saliva, bacterial community

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