山西汉族人群DYS713和DYS723基因座遗传多态性

本文调查了山西汉族人群DYS713、DYS723基因座遗传多态性，为法医学个人识别、亲子鉴定以及遗传学研究提供参考数据。     

Population data for four population groups from the United States for the eleven Y-chromosome STR loci recommended by SWGDAM

POPULATIONS: Caucasian ( n =1243), African American ( n =1605), Hispanic ( n =454), and Native American ( n =104).     

大肠埃希氏菌F18ab菌毛F亚单位基因的克隆与鉴定

根据已发表的大肠埃希氏菌F18ab菌毛F亚单位 (FedF/ab)的基因 (fedF/ab)序列 ,设计了 1对引物 ,利用PCR技术从大肠埃希氏菌F10 7/ 86、YCED1、YCED2、C、D和 12F株中分别扩增获得了一段序列 ,并克隆至 pGEM T载体 ,获得了重组质粒TF10 7F、TYCED1F、TYCED2F、TCF、TDF、T12FF。经琼脂糖凝胶电泳、序列测定及分析 ,6个重组质粒的大小均为 90 3bp ,与fedF/ab基因大小一致。其中大肠埃希氏菌F10 7/ 86、YCED1、C和 12F株的fedF基因序列完全相同 ;只有YCED2株在第 181位碱基处存在 1个C→T的无义变异差异 ,D株在第 6 5 5位碱基处存在 1个T→C变异差异并在氨基酸水平出现 1个S→P变异。结果表明 ,所克隆的序列均为F18ab菌毛F亚单位的基因     

中国北方汉族人DYS19基因座多态性及应用

调查了DYS19基因在中国北方汉人群体中的基因频率分布(0.013～0.516),观察到6个等位基因,各等位基因分布存在明显的地域性差异,并对陈旧、微量、降解的生物检材具有良好的适用性.     

山西汉族人群DYS460基因座遗传多态性

本文对山西地区汉族群体的DYS460基因座遗传多态性进行了调查,现报道如下。1材料与方法1.1样品100名无关男性个体和20名女性个体来自山西汉族人群,取外周血1ml,用EDTA抗凝,DNA提取采用TKM法[1]并做相应调整:TKM破坏红细胞,白细胞用2×蛋白酶K消化液(20 mmol/L Tris-HCl,pH7.6;20 mmol/L EDTA,pH8.0;300 mmol/L NaCl;1%SDS)和蛋白酶K(100μg/ml)55℃水浴3~5h。酚-氯仿抽提,无水乙醇沉淀,最后溶于无菌去离子水中。1.2方法引物引物序列参照基因库GDB,由大连TaKa-La公司合成。PCR扩增及电泳检测50μl反应体系,含50~100ng基因…     

Internal Validation of the AmpFlSTR Yfiler™ Amplification Kit for Use in Forensic Casework

Abstract:  Y-chromosomal short-tandem repeat (Y-STR) amplification has been used in forensic casework at the Bureau of Criminal Apprehension (BCA) Forensic Science Laboratory since 2003. At that time, two separate amplifications were required to type the SWGDAM recommended loci (DYS19, DYS385a/b, DYS389I, DYS389II, DYS390, DYS391, DYS392, DYS393, DYS438, and DYS439). The Yfiler™ kit coamplifies these loci as well as DYS437, DYS448, DYS456, DYS458, DYS635, and Y GATA H4. The Yfiler™ kit was validated following the internal validations outlined in the SWGDAM revised validation guidelines. Our studies show that 0.125 ng of male DNA will generate a complete 17 locus profile and that as little as 0.06 ng of male DNA yields an average of nine loci. In the male–male mixtures, a complete profile from the minor component was detected up to 1:5 ratio; most of the alleles of the minor component were detected at a 1:10 ratio and more than half the alleles of the minor component were detected at a 1:20 ratio. Complete YSTR profiles were obtained when 500 pg male DNA was mixed with female DNA at ratios up to 1:1000. At ratios of 1:5000 and 1:10,000 (male DNA to female DNA) inhibition of the YSTR amplification was evident. The YSTR results obtained for the adjudicated case samples gave significantly more probative information than the autosomal results. Our studies demonstrate that the Yfiler™ kit is extremely sensitive, does not exhibit cross-reactivity with female DNA, successfully types male DNA in the presence of overwhelming amounts of female DNA and is successful in typing actual forensic samples from adjudicated cases.