法医学杂志 ›› 2010, Vol. 26 ›› Issue (4): 250-252.DOI: 10.3969/j.issn.1004-5619.2010.04.003

• 论著 • 上一篇    下一篇

运用猪眼视网膜细胞DNA降解程度推断死亡时间

方  超1,林小红2,竞花兰1   

  1. (1. 中山大学 中山医学院法医病理教研室,广东 广州 510080; 2. 湛江市公安局 交警支队,广东 湛江 524000)
  • 发布日期:2010-08-25 出版日期:2010-08-28
  • 通讯作者: 通信作者:竞花兰,女,教授,硕士研究生导师,主要从事法医病理学、法医临床学研究;E-mail:jinghl@mail.sysu.edu.cn
  • 作者简介:方超(1984—),男,江苏扬州人,硕士研究生,主要从事法医病理学研究;E-mail:fch76@126.com

DNA Degradation of Porcine Retinal Cells for Estimation of Postmortem Interval

FANG CHAO1, LIN XIAO-HONG2, JING HUA-LAN1   

  1. (1. Department of Forensic Pathology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou 510080, China; 2. Traffic Police Detachment, Zhanjiang Public Security Bureau, Zhanjiang 524000, China)
  • Online:2010-08-25 Published:2010-08-28

摘要: 目的 运用单细胞凝胶电泳(single cell gel electrophoresis,SCGE)技术观察猪眼视网膜细胞DNA降解规律,推断死亡时间(postmortem interval,PMI)。 方法 猪死后取眼球放置于避光、温度(15±2) ℃、湿度(50±5)%条件下,分别于2、4、6、8、10、12、14、16、18、20、22、24 h提取猪眼球视网膜细胞,进行SCGE,荧光显微镜采集图像,并运用单细胞凝胶电泳图像分析系统(IMI 1.0)进行图像分析。 结果 死后2~24 h,视网膜细胞DNA降解程度随着PMI延长而增加;头DNA含量(%)、LT/LH、IT/IH与PMI的回归方程分别为y=92.227-5.188 x+0.019 x2+0.001 x3(R2=0.971)、y=0.035e0.191 x(R2=0.947)、y=0.099 e0.264 x(R2=0.955)。 结论 运用SCGE检测视网膜细胞DNA降解情况有助于推断PMI。

关键词: 法医病理学, 视网膜, 彗星试验, 猪, DNA降解, 死亡时间

Abstract: Objective To investigate DNA degradation of porcine retinal cells by single cell gel electrophoresis(SCGE) for estimation of postmortem interval(PMI). Methods Degradation of retinal cells was observed by SCGE at 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22 and 24 h after death respectively, under the environmental conditions of being kept in dark place as well as a controlled temperature of (15±2) ℃ and humidity of (50±5)%. The comet pictures were captured by fluorescence microscope and analyzed by single cell gel electrophoresis(IMI 1.0). Results From 2 h to 24 h postmortem, the degree of degradation of retinal DNA increased with the prolongation of PMI. The postmortem regression functions of head DNA%, LT/LH, IT/IH were y=92.227-5.188 x+0.019 x2+0.001 x3(R2=0.971), y=0.035e0.191 x(R2=0.947), y=0.099e0.264 x(R2=0.955), respectively. Conclusion The examination of retinal cell DNA degradation by SCGE is useful for estimating PMI.

Key words: forensic genetics, retina, comet assay, swine, DNA degradation, postmortem interval

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