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Isolating DNA from sexual assault cases: a comparison of standard methods with a nuclease-based approach

机译:从性侵犯案件中分离DNA:标准方法与基于核酸酶的方法的比较

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摘要

BackgroundProfiling sperm DNA present on vaginal swabs taken from rape victims often contributes to identifying and incarcerating rapists. Large amounts of the victim’s epithelial cells contaminate the sperm present on swabs, however, and complicate this process. The standard method for obtaining relatively pure sperm DNA from a vaginal swab is to digest the epithelial cells with Proteinase K in order to solubilize the victim’s DNA, and to then physically separate the soluble DNA from the intact sperm by pelleting the sperm, removing the victim’s fraction, and repeatedly washing the sperm pellet. An alternative approach that does not require washing steps is to digest with Proteinase K, pellet the sperm, remove the victim’s fraction, and then digest the residual victim’s DNA with a nuclease.
机译:背景从强奸受害者身上获取的阴道拭子上存在的精子DNA谱图分析通常有助于识别和监禁强奸犯。但是,受害者的大量上皮细胞会污染拭子上的精子,并使这一过程复杂化。从阴道拭子中获得相对纯净的精子DNA的标准方法是用蛋白酶K消化上皮细胞,以溶解受害人的DNA,然后通过沉淀精子,去除受害人的精子,从完整的精子中分离出可溶性DNA。分离,并反复洗涤精子沉淀。另一种不需要洗涤步骤的方法是用蛋白酶K消化,沉淀精子,去除受害者的部分,然后用核酸酶消化残留的受害人的DNA。

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