Population data for six X-chromosome STR loci in a Rio de Janeiro (Brazil) sample: Usefulness in forensic casework |
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Authors: | Celso C Tavares Leonor Gusmão Patrícia Domingues Juliana Aquino António Amorim Elizeu F de Carvalho |
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Institution: | a Lab. Diagnósticos por DNA, DECB, IBRAG, Univ. do Estado do Rio de Janeiro, Brazil b Departamento de Bio. Cel. e Genética, IBRAG, Univ. do Estado do Rio de Janeiro, Brazil c IPATIMUP, Instituto de Patologia e Imunologia Molecular da Univ. do Porto, Portugal d Departamento de Patologia e Labs., FCM, Univ. do Estado do Rio de Janeiro, Brazil e Faculdade de Ciências, Universidade do Porto, Portugal |
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Abstract: | This study presents data for the X-chromosome STR loci DXS7133, DXS7424, DXS8378, DXS6807, DXS7423 and DXS8377. In order to establish a database, unrelated individuals (males and females) from Rio de Janeiro were typed for the above loci. No significant differences were observed between allele frequencies in male and female samples (non-differentiation exact P values ≥ 0.156). Hardy-Weinberg equilibrium was tested in the female sample and no significant deviations were found. All six markers have shown to be highly polymorphic in our sample with gene diversities varying between 0.6797 for DXS7133, and 0.9260 for DXS8377. Pairwise linkage disequilibrium analysis did not allow discharging a possible association between DXS7133 and DXS7424 alleles in Rio de Janeiro population. Parameters of forensic interest, like PDM, PDF, Hetobs, Hetexp, were calculated for each locus. The high discrimination power estimated in both males and females, as well as mean exclusion chance in father/daughter duos and in father/mother/daughter trios, demonstrates the usefulness of these six markers in forensic investigation. |
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Keywords: | X-chromosome STR Database Rio de Janeiro Brazil |
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