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Mutation analysis of short tandem repeats in a population sample from Upper Silesia (southern Poland).

Legal Medicine 2018 April 2
In paternity testing, DNA polymorphism analysis not only settles explicitly disputed paternity issue but also provides information on mutation frequencies in STR loci. In this study, insertion or deletion of one repetitive unit was observed in 38 of 32,391 meiotic transfers analysed in 953 paternity testing cases. Parentage samples from Upper Silesia (southern Poland) were examined in 2008-2014 with the use of three commercially available amplification kits: AmpFlSTR Identifiler (Applied Biosystems), PowerPlex 16 HS (Promega) and PowerPlex ESX 17 (Promega). The rate of paternal mutations was 4.6 times higher than that of maternal ones. The highest mutation rate was noted at VWA locus. Interpopulation comparisons showed statistically significant differences in mutation rates of several STRs between Upper Silesia and populations from Brazil and China. There were no differences in occurrence of mutations between a population from Upper Silesia and another southern Polish population from a region of Lesser Poland. Our results suggest that knowledge of STR mutation rates in different populations may be important for calculations of probability of relationship in disputed paternity testing and that such calculations should be based on population-specific mutation rates, at least for some STR markers used commonly in forensic genetics.

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