Pinckard J Keith
Department of Pathology, Division of Forensic Pathology, University of Texas Southwestern Medical Center and the Southwestern Institute of Forensic Sciences, Dallas, Texas, USA.
Am J Forensic Med Pathol. 2008 Dec;29(4):375-81. doi: 10.1097/PAF.0b013e3181873709.
The objective of this manuscript is to provide an overview of the application of forensic DNA analysis as it pertains directly to the medical examiner, namely, in the identification of human remains. For samples yielding a sufficient amount of nondegraded DNA, the analysis of a standardized set of 13 short tandem repeats can provide enough statistical power not only to exclude a potential source but also to essentially attribute or match a source of DNA. Short tandem repeats from the Y chromosome may be analyzed in paternal lineage analysis and to isolate male DNA from a male-female mixture. For samples that are degraded, decomposed, or contain insufficient amounts of nuclear DNA, mitochondrial DNA may provide sufficient exclusionary potential and may also be used in lineage analysis. The Federal Bureau of Investigation maintains databases of both nuclear and mitochondrial DNA profiles against which profiles generated from postmortem examinations may be compared to identify human remains. Medical examiners must have sufficient familiarity with forensic DNA testing to obtain the most appropriate test samples during the postmortem examination and to obtain the most appropriate comparison samples from family members, when available, to maximize the statistical power of DNA analysis for the identification of human remains.
本手稿的目的是概述法医DNA分析的应用,该应用直接与法医相关,即在人类遗骸鉴定方面。对于能产生足够量未降解DNA的样本,对一组标准化的13个短串联重复序列进行分析,不仅能提供足够的统计效力以排除潜在来源,还能从本质上确定或匹配DNA来源。在父系血统分析以及从男女混合样本中分离男性DNA时,可对Y染色体上的短串联重复序列进行分析。对于已降解、分解或核DNA含量不足的样本,线粒体DNA可能具有足够的排除潜力,也可用于血统分析。联邦调查局维护着核DNA和线粒体DNA图谱数据库,可将尸检产生的图谱与之进行比对,以鉴定人类遗骸。法医必须充分熟悉法医DNA检测,以便在尸检过程中获取最合适的检测样本,并在可能的情况下从家庭成员处获取最合适的比对样本,从而最大限度地提高DNA分析在人类遗骸鉴定中的统计效力。