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Comparison of the Contact DNA Extraction Methods on the Surface of Differential Railway Fences
Pages: 9-
14
Year: 2022
Issue:
2
Journal: Journal of Chinese People's Public Security University(Science and Technology)
Abstract: 目的 比较铁路栅栏上接触性DNA检验方法,为快速有效地处理此类生物物证提供借鉴.方法 选取铁路线路上常见的3种铁路栅栏,分别采用模拟攀爬接触、棉签擦拭法和脱落细胞粘取器采集栅栏表面接触性DNA,分别使用Chelex-100法和Chelex-100联合Microcon-100法提取和纯化DNA并进行STR分型,比较评价STR分型效果.结果 使用脱落细胞粘取器时的等位基因检出率较高(29.7%);Chelex-100法等位基因检出率(28.2%)优于Chelex-100联合Microcon-100法(20.4%),但却存在明显的DNA混合现象;喷漆金属网上接触性DNA的分型效果优于铁质金属网及钢筋混凝土防护栅栏.结论 选用脱落细胞粘取器提取铁路栅栏接触性DNA的可获得较好的分型效果;针对DNA混合现象明显的此类检材,Chelex-100联合Microcon-100法可作为Chelex-100法的重要补充.
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