Анализа микросателитских маркера D18S70 и D20S116 на ДНК изолованој из дентина: примена у форензичкој медицини

Abstract

Introduction Short tandem repeats and more specifically microsatellites represent a powerful tool in forensic medicine. In the past years, they have been extensively used in human identification and paternity testing.

Objective The aim of the present study was to analyze two microsatellite markers in the Serbian population, i.e. to determine the number of alleles and the relevant forensic parameters.

Methods DNA was isolated from teeth samples using standard proteinase K digestion and phenol/chloroform alcohol extraction. PCR products were analyzed on polyacrilamide gels and visualized by AgNO₃ staining. Forensic parameters were calculated using the Cervus software.

Results The loci D18S70 and D20S116 were analyzed on a sample of 70 unrelated, healthy adult individuals from Serbia. The number of alleles was determined and Hardy Weinberg equilibrium was confirmed for both loci. D18S70 and D20S116 demonstrated 6 and 8 alleles, respectively. The power of discrimination (PD) and the power of exclusion (PE) for the tested STR loci, D18S70 and D20S116 were 0.92 (PD), 0.41 (PE) and 0.95 (PD), 0.480 (PE), respectively.

Conclusion According to the presented data, D18S70 and D20S116 are most informative markers. Based on allelic frequencies and statistical parameters for forensic testing, it may be suggested that these two microsatellites represent useful markers for individual identification and parentage analysis in the Serbian population.

Keywords: STR loci; D18S70; D20S116; forensic medicine