法医学杂志 ›› 2021, Vol. 37 ›› Issue (5): 621-626.DOI: 10.12116/j.issn.1004-5619.2020.400708

• 论著 • 上一篇    下一篇

基于16S rRNA高通量测序技术的肠道菌群多样性推断死亡时间

曹洁1(), 李文晋1, 王一飞1, 安国帅1, 卢晓军1,2, 杜秋香1, 李晋3(), 孙俊红1()   

  1. 1.山西医科大学法医学院,山西 太原 030001
    2.包头市公安局刑事侦查支队,内蒙古 包头 014030
    3.山西医科大学第二医院,山西 太原 030001
  • 收稿日期:2020-07-16 发布日期:2021-10-25 出版日期:2021-10-28
  • 通讯作者: 李晋,孙俊红
  • 作者简介:李晋,女,教授,博士研究生导师,主要从事肠道微生物与代谢性疾病研究;E-mail:jinli807@126.com
    孙俊红,男,教授,博士研究生导师,主要从事损伤病理学和猝死病理学研究;E-mail:sunjunhong146@163.com
    曹洁(1983—),女,博士,副教授,主要从事组学技术在法医学中的应用研究;E-mail:jie.cao@sxmu.edu.cn
  • 基金资助:
    国家自然科学基金面上资助项目(81971795);山西省应用基础研究青年科技资助项目(201801D221264)

Estimating Postmortem Interval Using Intestinal Microbiota Diversity Based on 16S rRNA High-throughput Sequencing Technology

Jie CAO1(), Wen-jin LI1, Yi-fei WANG1, Guo-shuai AN1, Xiao-jun LU1,2, Qiu-xiang DU1, Jin LI3(), Jun-hong SUN1()   

  1. 1.School of Forensic Medicine, Shanxi Medical University, Taiyuan 030001, China
    2.Criminal Investigation Detachment, Baotou Public Security Bureau, Baotou 014030, Inner Mongolia Autonomous Region, China
    3.Second Hospital of Shanxi Medical University, Taiyuan 030001, China
  • Received:2020-07-16 Online:2021-10-25 Published:2021-10-28
  • Contact: Jin LI,Jun-hong SUN

摘要: 目的

采用16S rRNA高通量测序技术探究大鼠肠道菌群变化与死亡时间(postmortem interval,PMI)之间的关系。

方法

大鼠腹腔麻醉致死后置于16 ℃,提取死后0、1、2、3、5、7、9、12、15、18、21、24、27和30 d共14个时间点的盲肠内容物DNA,采用16S rRNA高通量测序技术,检测大鼠盲肠内容物中的肠道菌群,对数据进行多样性及差异性分析。

结果

死后30 d内大鼠肠道微生物菌群总数未发生明显变化,但菌群多样性呈上升趋势。在死后13个时间点共筛选出119个具有显著差异的细菌群落。构建全部时间点、9 d前、12 d后PMI推断的偏最小二乘(partial least squares,PLS)回归模型,其决定系数(R2)分别为0.795、0.767和0.445;交叉验证均方根误差分别为6.57、1.96和5.37 d。

结论

利用16S rRNA高通量测序技术探究死后30 d内肠道菌群的变化规律,其组成和结构出现了明显的变化,且建立的PLS回归模型表明PMI与肠道菌群之间高度相关,呈一定时序性变化。

关键词: 法医病理学, 16S rRNA, 死亡时间推断, 肠道菌群, 高通量测序, 大鼠

Abstract: Objective

To explore the correlation between intestinal microbiota and postmortem interval(PMI) in rats by using 16S rRNA high-throughput sequencing technology.

Methods

Rats were killed by anesthesia and placed at 16 ℃, and DNA was extracted in caecum at 14 time points of 0, 1, 2, 3, 5, 7, 9, 12, 15, 18, 21, 24, 27 and 30 d after death. The 16S rRNA high-throughput sequencing technology was used to detect intestinal microbiota in rat cecal contents, and the results were used to analyze the rat intestinal microbiota diversity and differences.

Results

The total number of intestinal microbial communities did not change significantly within 30 days after death, but the diversity showed an upward trend. A total of 119 bacterial communities were significantly changed at 13 time points after death. The models for PMI estimation were established by using partial least squares (PLS) regression at all time points, before 9 days and after 12 days, reaching an R2 of 0.795, 0.767 and 0.445, respectively; and the root mean square errors (RMSEs) were 6.57, 1.96 and 5.37 d, respectively.

Conclusion

Using 16S rRNA high-throughput sequencing technology, the composition and structure of intestinal microbiota changed significantly within 30 d after death. In addition, the established PLS regression model suggested that the PMI was highly correlated with intestinal microbiota composition, showing a certain time series change.

Key words: forensic pathology, 16S rRNA, postmortem interval estimation, intestinal microbial community, high-throughput sequencing, rats

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