191名白山市汉族CODIS系统9个STR位点群体遗传学调查

目的　白山汉族CODIS系统 9个STR位点基因频率调查及其法医学应用 ;　方法　实验样本从 191位无相关白山市汉族个体获取 ,采用PCR复合扩增及 310遗传分析仪自动基因分型 ;　结果　这 9个STR位点均为高识别率位点 ,同重庆汉族人群群体遗传学数据比较显示有显著性差异 ;　结论　基因频率适合于白山汉族人群同一性概率及亲子鉴定概率计算 ;中国南北方汉族在个体识别及亲子鉴定概率计算时应采用本民族自己的等位基因频率。     

Quantifiler observations of relevance to forensic casework

The Quantifiler (QF) kit is regularly used by forensic scientists for DNA quantitation. We performed in-house validation studies which revealed some interesting observations. The QF standard displayed a two-fold difference between two different lot numbers which suggests that every standard should be tested prior to use. The Promega K562 DNA standard works well with the QF kit. c. 41% of samples that inhibited the internal PCR control (IPC) system within the QF kit still produced good Profiler Plus reactions. QIAquick was effective at removing inhibitors. The presence of dyes within casework samples were observed not to inhibit QF amplifications. Template DNA greater than 100 ng/muL appeared to inhibit the IPC. Close to identical concentration results were obtained when alternative analysis settings were used. These validation findings will assist DNA processes involved in forensic casework.     

Direct STR amplification from whole blood and blood- or saliva-spotted FTA without DNA purification

The DNA purification step has been thought to be essential for typing of STR DNA. However, this process is time-consuming, and there is a risk of unexpected cross-contamination during purification. We report a new method for direct short tandem repeat (STR) amplification using a newly developed direct PCR buffer, AnyDirect, which can amplify STR loci from whole blood and blood- or saliva-spotted FTA cards without DNA purification. The autosomal and Y chromosomal STR loci were analyzed for whole blood and blood or saliva spots of random individuals, followed by comparison of the results with those of corresponding purified DNA. The results from whole blood and blood spots showed perfect concordance with those from purified DNA without allele or locus drop-out. However, in the case of saliva spots, no amplification or locus drop-out was observed in some of the samples, which offers a topic for further study. Additionally, some commercial hot-start DNA polymerases other than AmpliTaq Gold DNA polymerase were also found to be compatible with this buffer system. Therefore, this direct PCR buffer was demonstrated to be useful for fast forensic DNA analysis or criminal DNA databases for which there is no need to store DNA samples.     

A LDR‐PCR Approach for Multiplex Polymorphisms Genotyping of Severely Degraded DNA with Fragment Sizes <100 bp*

Abstract: Reducing amplicon sizes has become a major strategy for analyzing degraded DNA typical of forensic samples. However, amplicon sizes in current mini‐short tandem repeat‐polymerase chain reaction (PCR) and mini‐sequencing assays are still not suitable for analysis of severely degraded DNA. In this study, we present a multiplex typing method that couples ligase detection reaction with PCR that can be used to identify single nucleotide polymorphisms and small‐scale insertion/deletions in a sample of severely fragmented DNA. This method adopts thermostable ligation for allele discrimination and subsequent PCR for signal enhancement. In this study, four polymorphic loci were used to assess the ability of this technique to discriminate alleles in an artificially degraded sample of DNA with fragment sizes <100 bp. Our results showed clear allelic discrimination of single or multiple loci, suggesting that this method might aid in the analysis of extremely degraded samples in which allelic drop out of larger fragments is observed.     

A Grass Molecular Identification System for Forensic Botany: A Critical Evaluation of the Strengths and Limitations*

Abstract: Plant material is frequently encountered in criminal investigations but often overlooked as potential evidence. We designed a DNA‐based molecular identification system for 100 Australian grasses that consisted of a series of polymerase chain reaction assays that enabled the progressive identification of grasses to different taxonomic levels. The identification system was based on DNA sequence variation at four chloroplast and two mitochondrial loci. Seventeen informative indels and 68 single‐nucleotide polymorphisms were utilized as molecular markers for subfamily to species‐level identification. To identify an unknown sample to subfamily level required a minimum of four markers or nine markers for species identification. The accuracy of the system was confirmed by blind tests. We have demonstrated “proof of concept” of a molecular identification system for trace botanical samples. Our evaluation suggests that the adoption of a system that combines this approach with DNA sequencing could assist the morphological identification of grasses found as forensic evidence.     

Missing in Amazonian Jungle: A Case Report of Skeletal Evidence for Dismemberment*

Abstract: This case study presents the results of the recovery and analysis of three sets of disarticulated and incomplete human remains found in Ecuador, within the Amazonian jungle. Recovered body parts sustained extensive sharp force trauma situated on different aspect of the skeleton. The anthropological examination (bone reassembly, biological profile) was followed by a detailed analysis of cut marks, including a basic experimental study on pig bones to demonstrate that dismemberment may have occurred within a certain amount of time after death. Despite the location (deep into the Amazonian jungle) and the perpetrator’s actions (dismemberment and dispersion of body parts in a river), forensic work both on the field and in laboratory allowed identification of the victims and the reconstruction of the sequence of events.     

大鼠心肌组织中microRNA和18S rRNA的降解与死亡时间的相关性

目的探讨大鼠死后心肌组织中microRNA和18S rRNA的含量变化与死亡时间的关系。方法将SD大鼠断颈处死后置于25℃室温、50%湿度的环境中,于死后不同时间提取心肌组织中总RNA。利用实时荧光定量PCR检测大鼠心肌组织中miR-1-2和18S rRNA的含量变化,结果用循环阈值(Ct值)表示,分析死亡时间与Ct值的关系,最终建立死亡时间推断的回归分析方程。结果大鼠死后120h内心肌组织中miR-1-2含量无明显变化,此后开始下降;而18S rRNA含量在96 h内逐渐增多,随后开始缓慢下降。大鼠死后不同时间18S rRNA的Ct值以及18S rRNA和miR-1-2的ΔCt值与PMI呈非线性相关,二次曲线拟合的R2值分别为0.9487、0.8072。结论 18S rRNA的Ct值和18S rRNA与miR-1-2的ΔCt值与PMI之间存在明显非线性关系,可以作为早期死亡时间推断的指标。     

全球化转型发展与中国角色

在两百多年的经济全球化进程中,世界经历了两波全球化和一次完整的逆全球化。当前,世界正面临第二波全球化转型发展的关键时期。全球化极大地促进了世界货物和服务贸易、国际资本流动和跨国直接投资,促使世界各国和地区深度融入全球产业链、价值链和创新链,推动了知识的生产、传播和扩散以及人力资本的增进和人口迁移,获得了持续的经济增长。但是,由于全球化导致利益分配不均,部分发达国家掀起逆全球化浪潮,致使贸易和投资规模萎缩、产业链断裂、科技进步受阻、世界经济低迷和社会矛盾激化。为此,中国必须积极参与重构国际经济规则和增进全球化公共产品的供给,主动承担主导全球化的责任。在夯实基于内需和全球化的国内大循环的基础上主动规划和融入国际大循环,创新驱动本土产业链现代化,激发全人类的企业家精神和深化经济体制机制改革,力促全球化转型发展。     

区块链技术下数字版权保护管理模式创新研究

区块链技术能够准确、及时、完整地记录数字版权产生、使用、交易、许可及转让等一系列过程,解决数字版权确权、交易问题,也为侵权行为的追踪提供支撑。因此,区块链技术的出现,为当前数字版权管理提供了新的选择:构建了分布式账本区块链技术登记确权共信机制、智能合约区块链技术的数字版权交易履行机制、时间戳区块链技术版权电子证据存证溯源机制、智能合约区块链技术数字版权监管机制等四大机制,探索出版权确权、交易和维权一体化的版权管理模式创新路径,并从法律、技术、标准等角度建立统一的数字版权保护管理创新模式。