Molecular characterization of a null allele at locus DXS8378

Typing of X-chromosomal short tandem repeat (STR) loci in a deficiency paternity case revealed a single Mendelian incompatibility between a female child and her putative grandmother, consisting of an opposite homozygosity at locus DXS8378. The presence of a null allele due to a primer binding site mutation on the child's paternally inherited X chromosome was confirmed by amplification with newly designed DXS8378 external primers. Sequencing analysis showed a point mutation (C > T transition at position 168, according to GenBank accession G08098) in the binding site of the original DXS8378 reverse primer.     

河南汉族人群3个X-STR基因座遗传多态性

本文对154名河南汉族无关女性个体GATA165812、DXS6800、GATA31E08 3个基因座进行遗传学调查,以期为相关研究及实践提供参考数据.     

Genetic data of four X-chromosomal STRs in a population sample of Santa Catarina, Brazil

Population: A total of 184 healthy unrelated individuals (70 females and 114 males), autochthonous from Santa Catarina, Brazil.     

汉族人群DXS9898基因座的遗传多态性

目的研究汉族群体DXS9898基因座的遗传多态性,为法科学应用提供基础数据。方法应用PCR及PAG电泳技术,对成都地区汉族群体199名女性无关个体及97名男性无关个体进行群体遗传学调查。结果共检出6个等位基因,片段大小为189～214bp,其基因型分布符合Hardy-Weinberg平衡。家系调查证实等位基因的传递遵循孟德尔遗传规律。女性样本杂合度为0.5930;男、女性样本个人识别能力(Dp)分别为0.5667、0.9420;父-母-女三联体鉴定的非父排除率(PE)为0.5862。结论DXS9898基因座在法科学个人识别及女性小孩的亲权鉴定中具有较高的实用价值。     

Genetic data of 4 X-chromosomal short tandem repeats in a North of Portugal population

POPULATION: One hundred unrelated females and 100 unrelated males, autochthonous, healthy, from the North of Portugal.     

山西汉族X-STR基因座DXS9902、DXS7132的遗传多态性

X染色体STR基因座由于其独特的遗传方式,在法医学鉴定的一些特殊案件中表现出了常染色体遗传标记无法比拟的优势,已有多个X染色体的STR基因座被应用于法医学鉴定。本研究通过对山西汉族人群DXS9902和DXS7132两个X-STR基因座及单倍型遗传多态性进行调查,为法医学个体识别、亲子鉴定及遗传学研究等提供了基础数据。     

Allele distribution of three X-chromosome STR loci in an antioquian population sample

The X-linked short tandem repeats (STR) markers have proven to be very useful tools for paternity testing when the disputed child is female. The aim of this study was to describe the polymorphism of three X-chromosomal STR loci (DXS6797, DXS6800 and HPRTB) in an Antioquian (Colombian) population sample. PCR products were separated in 4% acrylamide-bis-acrylamide denaturing gels followed by silver staining. Allele size determination and genotyping were performed according to recommendations of the DNA Commission of the International Society of Forensic Genetic using the allelic ladder manufactured at home and based on DNA controls including K562 and 9947A (Promega). Gene frequencies were calculated using ARLEQUIN version 3.11. Population genetic data were obtained by analyzing 127-400 unrelated males and 135 unrelated females from Antioquian (Colombian) population. Distribution of the allele frequencies of these systems for Antioquia population is similar to the European populations.     

DXS8378和DXS6808基因座在山西汉族的遗传多态性

X染色体短串联重复序列（STR）作为遗传标记在法医学应用领域有一定的特殊性。为了获得更多的X—STR基因座的群体资料．从人类基因组学数据库中选择了DXS8378和DXS6808基因座，参照数据库中的引物序列，应用PCR技术建立合适的扩增条件，对山西汉族无关人群的等位基因及基因型的分布进行了调查，为法医遗传学研究提供基础数据。     

Genetic Polymorphisms of four X-STR Loci: DXS6797, DXS6800, HPRTB and GATA172D05 in a Peruvian population sample

The X linked short tandem repeats (STR) markers have proven to be very useful tools for paternity testing when the disputed child is female. The purpose of this study was to describe the genetic polymorphism of four X-chromosomal STR loci (DXS6797, DXS6800, HPRTB and GATA172D05) in a Peruvian population sample and evaluate their efficiency in forensic practice and paternity testing.     

Sequence variation at three X chromosomal short tandem repeats in Caucasian and African populations

Sequence variation for the X chromosome short tandem repeats (X-STRs) DXS9898, DXS6789 and GATA172D05 was studied in two major population groups, namely Caucasians and Africans. DXS6789 revealed two different subtype sequence polymorphisms: for shorter alleles, with less than 17 repeats, results showed a simple composition with the following structure: (TATG)_m-(TATC)_n. For longer alleles, a constant TATC insertion was observed at the beginning of the variable repeat unit. Additionally, alleles identical in size revealed structural variations regarding the TATG/TATC proportion. Africans showed a higher intra-allelic variation at this locus than the Caucasian population group. For all three loci, DXS9898, DXS6789 and GATA172D05, no unique structure was found among Africans and Caucasians.