共查询到18条相似文献,搜索用时 135 毫秒
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目的利用法医DNA标准品对自主研发的法医DNA检验试剂耗材进行电泳检测准确性的实验考查。方法实验平台分为2个:平台1全部由美国AppliedBiosystems公司进口的3130xl遗传分析仪、16道电泳毛细管与甲酰胺、电泳缓冲液、凝胶构成;平台2由AppliedBiosystems公司进口的3130xl遗传分析仪、16道电泳毛细管与本实验室研发的甲酰胺、电泳缓冲液、凝胶构成。在实验平台上对allelicladder、内标等标准品以及阳性对照9947a的STR复合扩增产物进行电泳检测,利用GeneMapper软件对电泳结果进行分析。结果自主研发的法医DNA检验试剂耗材可与国外进口的3130xl遗传分析仪配套使用,构建的实验平台对法医DNA标准品的检测结果准确无误。结论自主研发的甲酰胺、电泳缓冲液、凝胶等法医DNA检验试剂耗材检测准确性达到了国外同类产品水平。 相似文献
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天津汉族人群D19S433和D2S1338基因座遗传多态性 总被引:1,自引:0,他引:1
采用AB I AmpFlSTR IdentifilerTM荧光标记复合扩增试剂盒,AB I-310型DNA序列分析仪,对200名天津地区汉族无关个体血样D19S433和D2S1338基因座遗传多态性进行调查,现报告如下。1材料与方法200份天津地区汉族无关个体血样系本实验室日常检案积累。采用Chelex-100法提取血样DNA[1];PCR扩增、电泳检测及数据收集均按AB I公司操作手册进行。用AB I-GeneScan、Genotype软件分析DNA分型,并制成COD IS表格,导入DNA数据分析处理系统,进行统计学计算,得到D19S433、D2S1338基因座的等位基因频率和相关统计学数据。2结果与讨论天… 相似文献
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1案例资料
1.1 简要案情
2011年11月23日在某地发现1具无名尸体,经解剖仅具有男性生理特征,现场有1处血迹.提取无名尸血样及现场血迹进行DNA分型检验.
1.2 DNA检验
采用Chelex-100法提取尸体及现场血迹样本DNA.采用ID试剂盒进行PCR复合扩增,扩增产物经3130遗传分析仪进行毛细管电泳,用GenemapperID v3.2软件分析各基因座的基因型.2份检材的分型结果一致,提示为同一人,但牙釉质蛋白基因座(amelogenin gene,Amel)分型显示为女性(图1). 相似文献
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目的对3种方法提取骨骼DNA的效果进行比较,为实际应用中选择方法提供参考。方法应用骨骼孵化液法、DNA Investigator试剂盒法和CTAB法对同一骨骼样本进行脱钙、消化、提取DNA,用紫外分光光度计检测DNA的浓度值;使用Identifilerplus试剂盒进行PCR扩增,3130xl型遗传分析仪检测分型,并用SPSS 19.0软件对各项实验结果进行统计分析。结果 1g骨粉样本经上述3种方法提取,得到的DNA浓度分别为26.53ng/μL±5.47ng/μL、23.63ng/μL±4.56ng/μL、14.93ng/μL±3.88ng/μL;单因素方差分析表明3组数据之间差异性具有统计学意义。PCR扩增后电泳检测结果显示,骨骼孵化液法和DNA Investigator试剂盒法基因座检出率和峰值大致相同,均优于CTAB法。结论本文比较的3种方法均可用于骨骼样本的实际检案,检出率较高的两种方法可作为优选方案。 相似文献
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近年来,法医实践中对复杂亲缘关系的鉴定需求越来越多,需要联合多种遗传标记进行判断,如STR、X/Y遗传标记、SNP、线粒体DNA等。二代测序技术可以将多种遗传标记纳入一个检测体系中。本文报道了开发出的一套包含29个常染色体STR、36个Y-STR、32个X-STR、71个Y-SNP以及mtDNA全基因组的检测体系DNATyperTMNGSPanel v1.0。根据DNA分析方法科学工作组(SWGDAM)的验证指南,对该体系的重复性、准确性、一致性、灵敏度、混合样本、物种特异性等指标进行了评估。结果表明,该体系分型结果与毛细管电泳的一致性为99.72%,与ForenSeq?DNA Signature Prep Kit试剂盒相重合的基因座结果均完全一致。在0.5~10 ng DNA模板量范围内无等位基因丢失,而在0.25、0.125 ng时分别出现2、9个基因座的丢失。在男女混合比例为2︰1时女性成分开始出现等位基因丢失,混合比例为9︰1、4︰1、2︰1、1︰1时,检出率分别为54.72%、81.13%、98.11%、100%,若男女混合比例为1︰4则男性成分开始出现... 相似文献
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1案例资料1.1简要案情日常检案中发现的疑为D19S433基因座稀有等位基因的2例亲权鉴定。1.2实验方法采用Chelex-100法提取甲、甲父、乙和乙母的DNA;使用Power Plex21试剂盒(promega公司,美国)和AGCU Expressmarker 22试剂盒(无锡中德美联公司)进行STR复合扩增;PCR扩增产物在ABI-3130型遗传分析仪(ABI,美国)上进行毛细管电泳,电泳信息由DataCollection数据收集软件自动收集,GeneMapperID v3.2.1软件分析数据获得各基因座的基因型。 相似文献
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The Optimization of Electrophoresis on a Glass Microfluidic Chip and its Application in Forensic Science 下载免费PDF全文
Jun P. Han Ph.D. Jing Sun Ph.D. Le Wang Ph.D. Peng Liu Ph.D. Bin Zhuang Ph.D. Lei Zhao M.S. Yao Liu Ph.D. Cai X. Li Ph.D. 《Journal of forensic sciences》2017,62(6):1603-1612
Microfluidic chips offer significant speed, cost, and sensitivity advantages, but numerous parameters must be optimized to provide microchip electrophoresis detection. Experiments were conducted to study the factors, including sieving matrices (the concentration and type), surface modification, analysis temperature, and electric field strengths, which all impact the effectiveness of microchip electrophoresis detection of DNA samples. Our results showed that the best resolution for ssDNA was observed using 4.5% w/v (7 M urea) lab‐fabricated LPA gel, dynamic wall coating of the microchannel, electrophoresis temperatures between 55 and 60°C, and electrical fields between 350 and 450 V/cm on the microchip‐based capillary electrophoresis (μCE) system. One base‐pair resolution could be achieved in the 19‐cm‐length microchannel. Furthermore, both 9947A standard genomic DNA and DNA extracted from blood spots were demonstrated to be successfully separated with well‐resolved DNA peaks in 8 min. Therefore, the microchip electrophoresis system demonstrated good potential for rapid forensic DNA analysis. 相似文献
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DYF155S1基因座的法医学应用研究 总被引:2,自引:0,他引:2
目的探讨Y染色体小卫星DYF155S1基因座在法医学中的应用价值。方法采用荧光MVR-PCR和Amp-FLP技术。结果同一个体不同组织所获得的分型结果一致;本方法能作出正确分型的最低基因组DNA量为0.3 ng;在女性成份为男性成份100倍的混合DNA样本(总DNA量多少为110 ng)中能正确检出DYF155S1基因型;调查130个父系家庭的男性成员样品(减数分裂336次),总共发现DYF155S1基因座有3次突变,突变率为0.9%。对强奸案混合斑的分析,可直接检出DYF155S1基因型。但是,本方法只能区分哺乳类雄性动物与非哺乳类动物。结论采用荧光MVR-PCR和Amp-FLP方法分析Y染色体小卫星DYF155S1基因座,方法可靠,灵敏度高,对混合斑和微量检材中男性DNA的分析具有较高的应用价值。 相似文献
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We describe the forensic science application of a method for quantification of human genomic deoxyribonucleic acid (DNA). The two cases cited in this report involve DNA samples extracted from skin tissue and bloodstained clothing recovered from different crime scenes. High-molecular-weight DNA was recovered from both specimens, and the concentrations of these DNAs were estimated to be approximately 0.5 microgram/microL by ethidium bromide/agarose gel electrophoresis. Using the human-specific DNA probe p17H8 (locus D17Z1) to quantify the amount of human genomic DNA in these samples, it is shown that less than 1% of the DNA isolated from the skin tissue is of human origin and that the DNA isolated from the bloodstained clothing is effectively devoid of human DNA sequences. These case examples illustrate the need to quantify not only the total amount of DNA recovered from forensic casework material, but also the proportion of the DNA that is of human origin. 相似文献
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印记基因KCNQ1的遗传多态性及在亲权鉴定中的应用 总被引:1,自引:1,他引:0
目的为了调查印记基因KCNQ1的STR位点在中国汉族人群中的遗传多态性,利用亲源印记等位基因(parentally imprinting allele,PIA)分型法确定孩子的等位基因亲代来源,为亲权鉴定提供新的侯选STR位点。方法应用Chelex法提取153例佳木斯地区汉族健康无血缘关系个体DNA,用QIAamp Blood Kit(Qiagen)法提取3个家庭10个个体DNA,PCR扩增,凝胶电泳分型,ABIPRISM^TM 3730XL DNA测序仪测序;甲基化敏感性限制性内切酶消化孩子基因组DNA,PCR扩增,确定孩子等位基因的亲代来源。结果发现在中国佳木斯地区汉族人群中KCNQ1基因的STR有7个等位基因,多态信息含量为0.662,且KCNQ1基因的STR位点呈父源印记。结论印记基因KCNQ1的STR位点有很好的多态性,可为亲权鉴定提供新的侯选遗传标记,其亲源特异性甲基化标记有望应用于单亲鉴定中。 相似文献
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Antoinette A. Westen M.Sc. ; Jord H. A. Nagel Ph.D. ; Corina C. G. Benschop B.Sc. ; Natalie E. C. Weiler B.Sc. ; Bas J. de Jong M.Sc. ; Titia Sijen Ph.D. 《Journal of forensic sciences》2009,54(3):591-598
Abstract: Evidentiary traces may contain low quantities of DNA, and regularly incomplete short tandem repeat (STR) profiles are obtained. In this study, higher capillary electrophoresis injection settings were used to efficiently improve incomplete STR profiles generated from low-level DNA samples under standard polymerase chain reaction (PCR) conditions. The method involves capillary electrophoresis with higher injection voltage and extended injection time. STR peak heights increased six-fold. Inherent to the analysis of low-level DNA samples, we observed stochastic amplification artifacts, mainly in the form of allele dropout and heterozygous peak imbalance. Increased stutter ratios and allele drop-in were rarely seen. Upon STR typing of 10:1 admixed samples, the profile of the major component did not become overloaded when using higher injection settings as was observed upon elevated cycling. Thereby an improved profile of the minor component was obtained. For low-level DNA casework samples, we adhere to independent replication of the PCR amplification and boosted capillary electrophoresis. 相似文献
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目的对不同方法提取甲醛固定组织中DNA的效果进行比较,寻找一种操作简便、经济实用、质量较高的DNA提取方法。方法取甲醛固定的心肌组织14份,分别以改良酚-氯仿法,改良Trizol法,试剂盒法提取DNA,进行紫外分光光度计测定OD260/OD280值后,经PCR扩增,琼脂糖凝胶电泳分析确定提取的DNA质量。结果改良酚-氯仿法,改良Trizol法,试剂盒法OD260/OD280比值分别为1.841 5±0.380 4、1.370 5±0.336 7、0.831 6±0.175 0。两两比较均有显著性差异(P<0.05)。3种不同方法提取DNA含量分别为0.943 8±0.530 1、0.707 5±0.423 6、0.342 8±0.182 5。PCR扩增后琼脂糖凝胶电泳显示以改良酚-氯仿法所提DNA的谱带清晰度好于其它两种方法。结论改良酚-氯仿法简便有效,所用试剂价格低廉,是一种经济实用的甲醛固定组织DNA提取方法。 相似文献
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H Margolis-Nunno L Brenner J Cascardi L Kobilinsky 《Journal of forensic sciences》2001,46(6):1480-1483
CSF1PO is one of the thirteen core loci used for the CODIS database, and alleles reported for this short tandem repeat (STR) locus contain from 6 to 15 repeats of the tetranucleotide AGAT. Screening of DNA from 76 individuals by gel electrophoresis and silver stain detection yielded one sample that contained a rare, off-ladder CSF1PO allele; an allele larger than CSF1PO15 was detected in a heterozygote that also contained a CSF1PO10 allele. Capillary electrophoresis analysis using GeneScan software demonstrated that the variant allele contained four bases more than CSF1PO15. Following agarose gel electrophoresis to separate the two alleles of the heterozygote and cycle sequencing using dye terminators, sequence analysis showed that the variant, which was otherwise identical to the CSF1PO GenBank sequence, contained exactly 16 AGAT repeats. These results demonstrate the existence of an additional CSF1PO allele, a previously unreported size variant, CSF1PO16. 相似文献