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Determination of the Biological Attribute of Evidence at the Scene Using Reverse Transcription PCR and Real-time Fluorescent Quantitative PCR
Author(s): XU Yan, ZHANG Chen, XU Qingwen, HUANG Jiangping, LIU Yazuo, ZOU Kainan, PING Yuan, ZHOU Huaigu
Pages: 259-
262
Year: 2013
Issue:
4
Journal: Journal of Forensic Medicine
Keyword: forensic genetics; reverse transcriptase polymerase chain reaction; real-time fluorescent quantitative polymerase chain reaction; blood; saliva; semen;
Abstract: 目的 探寻分子生物学方法判定刑事案件现场物证的生物属性的可行性. 方法 取30份现场生物检材,其中血液(斑)、唾液(斑)、精液(斑)各10份,分别进行常规检验法和分子生物学方法,通过DNA-RNA共提取技术,将其中的mRNA运用反转录PCR(reverse transcription PCR,RT-PCR)技术反转录成cDNA,根据3种生物检材不同的目标基因设计3对特异性引物,进行实时荧光定量PCR扩增,通过熔解曲线测定不同的熔解温度(Tm)和不同长度的扩增片段来区分生物检材. 结果 血液(斑)的Tm值为(84.5±0.2)℃,片段长度177 bp;唾液(斑)的Tm值为(76.9±0.3)℃,片段长度134 bp;精液(斑)的Tm值为(88.5±0.2)℃,片段长度294 bp. 结论 与常规检验法比较,联合应用RT-PCR和实时荧光定量PCR技术判定检材的生物属性特异性强、灵敏度高、结果稳定可靠,可应用于日常法医物证检验.
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