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Ferreira S.T.G.,Institute Pesquisa Of Dna Forense Policia Civil Do Distrito Federal | Paula K.A.,Institute Pesquisa Of Dna Forense Policia Civil Do Distrito Federal | Maia F.A.,Institute Pesquisa Of Dna Forense Policia Civil Do Distrito Federal | Svidizinski A.E.,Institute Pesquisa Of Dna Forense Policia Civil Do Distrito Federal | And 7 more authors.
Forensic Science International: Genetics Supplement Series | Year: 2015

In sexual-assault cases, the use of DNA databases may be decisive in identifying perpetrators. Particularly, the analysis of Y chromosome STRs may play a crucial role in the study of the male portion in (i) male/female cell mixtures, (ii) mixed DNA profiles from more than one perpetrator, or from perpetrators and the sexual partners (iii) and azoospermic or oligospermic perpetrators. The analysis of Y chromosome specific markers can be also important in the study of the geographic ancestry of male lineages. The aim of this study was to genotype samples collected from sexual-assault cases in Brasília, Brazil, using the PowerPlex Y-23 System and to construct a Y-STR database of these profiles in the Instituto de Pesquisa de DNA Forense da Polícia Civil do Distrito Federal (Forensic DNA Research Institute of the Federal District Civil Police) in Brasília, in order to aid forensic casework. A total of 650 evidentiary samples were previously typed for autosomal STRs and, using a DNA database of STRs profiles of biological evidence from sexual assaults, we found 78 serial rapists who attacked 223 women in Brasília. In this work, we analyse 420 complete 23 Y-STR profiles (haplotypes) and we present the results of Y-STR analysis in sexual-assault cases. To assess the substructure of Brazilian populations we conducted Analysis of Molecular Variance (AMOVA) on different Brazilian population groups. The use of a 23 Y-STR DNA database and of an autosomal STR DNA database of samples from sexual assaults in a dual approach of a combined autosomal/Y chromosomal STR analysis played an important role in identifying perpetrators and serial rapists, highlighting the importance of its use in the investigation of sexual assaults. © 2015 Elsevier Ireland Ltd.


Ferreira S.T.G.,Institute Pesquisa Of Dna Forense Policia Civil Do Distrito Federal | Paula K.A.,Institute Pesquisa Of Dna Forense Policia Civil Do Distrito Federal | Maia F.A.,Institute Pesquisa Of Dna Forense Policia Civil Do Distrito Federal | Svidizinski A.E.,Institute Pesquisa Of Dna Forense Policia Civil Do Distrito Federal | And 4 more authors.
Forensic Science International: Genetics Supplement Series | Year: 2015

The use of DNA databases has proved decisive in many types of criminal investigations. In sexual assaults and rapes, DNA databases and evidence may play a very important role in the investigations and in the identification of the perpetrators. In Brazil, until 2012 and 2013 there was no legislation regarding DNA databases of suspected perpetrators or convicted individuals. As there was no legislation concerning this subject and due to the need for solving crimes related to sexual assaults, the Instituto de Pesquisa de DNA Forense da Polícia Civil do Distrito Federal (Forensic DNA Research Institute of Federal District Civil Police) in Brasília, created in 1998, a DNA database of evidence collected in sexual-assaults cases to aid criminal investigations. The aim of this study is to demonstrate the successful experience of our Institute in aiding criminal investigations to solve sexual assaults cases and to identify perpetrators using this kind of DNA database. Forensic scientists using a DNA database of evidence from sexual assaults cases, working together with Federal District Civil Police authorities and investigators, found 78 serial rapists who attacked 223 women in Brasília, Brazil. © 2015.

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