短串联重复vWFⅢ扩增片段长度多态性在法医学应用的可行性研究

目的探讨STR位点vWFⅢ用于法医学鉴定中的实用价值。方法应用聚合酶链式反应（PCR），聚丙烯酰胺凝胶电泳结合染银显带的分离方法对STR位点vWFⅢ扩增片断长度多态性进行研究。结果经过优化筛选掌握了该位点的最适扩增条件，其对各类检材均获得稳定可靠的扩增产物。本方法的灵敏度达10pg基因组DNA、0．5μl全血、1μl新血痕、0．1μl精液、0．2μl新鲜精斑。结论本方法快速、灵敏、准确，在法医学个人识别和亲子鉴定中具有推广应用的价值。     

GeneMarker® HID: A reliable software tool for the analysis of forensic STR data

Abstract: GeneMarker^® HID was assessed as a software tool for the analysis of forensic short tandem repeat (STR) data and as a resource for analysis of custom STR multiplexes. The software is easy to learn and use, and includes design features that have the potential to reduce user fatigue. To illustrate reliability and accuracy, STR data from both single‐source and mixture profiles were analyzed and compared to profiles interpreted with another software package. A total of 1898 STR profiles representing 28,470 loci and more than 42,000 alleles were analyzed with 100% concordance. GeneMarker HID was also used to successfully analyze data generated from a custom STR multiplex, with simplified and rapid implementation. Finally, the impact of the user‐friendly design features of the software was assessed through a time scale study. The results suggest that laboratories can reduce the time required for data analysis by at least 25% when using GeneMarker HID.     

IT WAS MY IDEA: CONSIDERING THE INSTIGATION OF CO‐OFFENDING*

More than twenty years ago, Albert Reiss (1988) recognized that some individuals are responsible for instigating group offending, whereas others follow accomplices into crime (or offend alone). Since this initial discussion by Reiss, however, little clarity has emerged regarding the factors that predict or explain the instigation of co‐offending. Specifically, some literature has suggested that the tendency to instigate varies systematically across individuals, such that chronic or serious offenders are more likely to instigate group crime. Instigation also may vary across crime types (i.e., within‐individuals), according to whether individuals have crime‐specific skill or experience. Using data from inmates in the Colorado Department of Corrections to investigate these hypotheses, the results reveal that individuals with earlier ages of criminal onset are more likely to report they instigate group crime, net of controls. At the same time, indicators of crime‐specific expertise predict the tendency to instigate group crime. The Discussion section considers the implications of these results and offers directions for future research.     

10个STR基因座荧光复合扩增体系的研制

目的建立10个STR基因座荧光标记复合扩增体系,并评价其法医学应用价值。方法在北京、山西、广东汉族,辽宁满族、西藏藏族群体中调查STR基因座遗传多态性,筛选出9个具有高度多态性和法医应用价值的STR基因座及性别基因座。构建四色荧光素标记复合扩增体系,制备等位基因分型标准物,编制分析软件,并对体系的种属特异性、灵敏度、稳定性、混合样本等检测能力进行考察。结果建立的复合扩增体系遗传稳定好,累积非父排除率可达0.999 96,累积个体识别率可达0.999 999 999 999 3;与CODIS系统均不存在连锁遗传;各基因座间布局合理、无杂峰、扩增结果清晰易辨,并可实现检测分析自动化。体系种属特异性较好,灵敏度为0.1ng,稳定性好,混合样本检出范围在2∶8～8∶2之间。实际案例检材检测结果好。结论本文建立的复合扩增体系在法医学实践中有较好的应用价值。     

国产试剂盒Goldeneye~(TM)20A在亲权鉴定中的应用评估

目的评估GoldeneyeTM20A试剂盒在亲权鉴定中的应用价值。方法应用GoldeneyeTM20A试剂盒对289宗亲权鉴定案例中的FTA卡血样本基因组DNA进行PCR扩增,扩增产物用ABI 3130xl遗传分析仪进行毛细管电泳,GeneMapper v3.2和GeneMarker HID软件进行基因分型及统计学分析,并与IdentifilerTM、SinofilerTM、PowerPlex16 3种试剂盒进行比较。结果采用GoldeneyeTM20A试剂盒,累积非父排除概率(CPE)为0.999 999 996,累积个人识别能力(CPD)达0.999 999 999 999 999 999 999 932 44,与目前常用的3种试剂盒相比较,GoldeneyeTM20A试剂盒在不排除的案例中具有更高的CPI值;在排除的案例中具有更多的排除指标。结论国产GoldeneyeTM20A试剂盒在亲权鉴定中有较高的应用价值。     

Assessing a novel room temperature DNA storage medium for forensic biological samples

The ability to properly collect, analyze and preserve biological stains is important to preserving the integrity of forensic evidence. Stabilization of intact biological evidence in cells and the DNA extracts from them is particularly important since testing is generally not performed immediately following collection. Furthermore, retesting of stored DNA samples may be needed in casework for replicate testing, confirmation of results, and to accommodate future testing with new technologies.A novel room temperature DNA storage medium, SampleMatrix™ (SM; Biomatrica, Inc., San Diego, CA), was evaluated for stabilizing and protecting samples. Human genomic DNA samples at varying amounts (0.0625-200 ng) were stored dry in SM for 1 day to 1 year under varying conditions that included a typical ambient laboratory environment and also through successive freeze-thaw cycles (3 cycles). In addition, spiking of 1-4× SM into samples prior to analysis was performed to determine any inhibitory effects of SM. Quantification of recovered DNA following storage was determined by quantitative PCR or by agarose gel electrophoresis, and evaluation of quantitative peak height results from multiplex short tandem repeat (STR) analyses were performed to assess the efficacy of SM for preserving DNA.Results indicate no substantial differences between the quality of samples stored frozen in liquid and those samples maintained dry at ambient temperatures protected in SM. For long-term storage and the storage of low concentration samples, SM provided a significant advantage over freezer storage through higher DNA recovery. No detectable inhibition of amplification was observed at the recommended SM concentration and complete profiles were obtained from genomic DNA samples even in the presence of higher than recommended concentrations of the SM storage medium. The ability to stabilize and protect DNA from degradation at ambient temperatures for extended time periods could have tremendous impact in simplifying and improving sample storage conditions and requirements. The current work focuses on forensics analysis; however this technology is applicable to all endeavors requiring storage of DNA.     

Application of RapidHITTM 200 System in Forensic MedicineCSCD

Objective: To validate the analysis capability of RapidHITTM 200 system for four kinds of routine forensic samples and the recyclable capability of template, template DNA and PCR products in the process of twice duplicate detection. Methods: The buccal swabs underwent the test twice by RapidHITTM 200 system, and the template DNA and PCR products that arose in the system were also tested for two times. After four kinds of routine forensic samples were detected by RapidHITTM 200 system, the follow- up tests of the template, template DNA and PCR products that arose in the system were performed. Results: The STR loci could be detected in the buccal swabs by the system for the first time. However, part of the STR loci lost during the second test. And the peak value obtained in the second test was significantly reduced than the one in the first time. The average STR loci detection rates of the template DNA and PCR products were both less than 50% in the second test, which were significantly reduced than that in the first test. In addition, the analysis capability of the system for the tissues and buccal swabs was better than that for the blood and cigarette butts. Compared with the first test, the STR loci detection rate of the tested items, template DNA and PCR products decreased with the numbers of tests. Conclusion: RapidHITTM 200 system is more effective in retesting buccal swabs than other samples, whereas the items, DNA template, PCR products obtained in the first and second time cannot be directly used for the further application and study of forensic medicine. © 2018 by the Editorial Department of Journal of Forensic Medicine.     

Stranger rape: classifying Spanish sexual offences using multiple correspondence and cluster analyses

We have analysed the information in 342 police reports of stranger sexual offences recorded in 2010. We have carried out a multiple correspondence analysis and a cluster analysis using modus operandi variables to identify differential profiles in these types of sexual offences. We have come up with three profiles of stranger sexual offences, which concur in the two techniques used. By analysing the personal variables of the offenders with such profiles, we have found differences in terms of the offender’s country of origin and age. We will discuss the consequences of these results on the police investigation of stranger sexual offences.     

Deliberate ingestion of foreign bodies as a form of self-harm among inpatients within forensic mental health and intellectual disability services

Deliberate foreign body ingestion is a significant issue in prison and psychiatric settings. It is associated with serious physical complications, including bowel obstruction, perforation and haemorrhage. Episodes of deliberate foreign body ingestion were identified retrospectively from 5417 incident records from two inpatient forensic services (one mental health and one intellectual disability) over a one year timeframe, using related search terms. Rates were compared according to gender, diagnosis and level of security. Incidents of deliberate foreign body ingestion were found to occur on average every 2.7 days across the study population, with 133 incidents recorded over a one year period, accounted for by 27 patients. Women and patients in lower levels of security were significantly more likely to engage in deliberate foreign body ingestion. Staff responses to this behaviour were highly variable. Deliberate foreign body ingestion occurs frequently within inpatient forensic services, and can have significantly detrimental physical implications for affected patients. Further research should investigate the psychiatric and intellectual disability profile of such individuals in further detail, as well as exploring patient narratives; both of which will help inform development of treatment strategies.