Discordance at D3S1358 locus involving SGM Plus™ and the European new generation multiplex kits

During the course of routine database sample analysis in the Israel Police DNA database, an off-ladder D3S1358 allele, calculated to be >22.1, extending into the adjacent vWA locus was observed using Applied Biosystems SGM Plus™ kit.To verify the size of this D3S1358 long allele and to ensure it was not part of a trialle pattern in the neighboring locus, the sample was amplified using three of the European new generation STR multiplex kits: NGMTM (Applied Biosystem), Powerplex™ ESX and ESI (Promega). The results of these amplifications determined the variant to be a 22 allele. Subsequent sequencing confirmed this designation and revealed a nucleotide polymorphism. Ten additional SGM Plus™ profiled samples with D3S1358 alleles larger than 19, were re-analyzed using NGMTM and Powerplex™ ESX which also showed discordance in the calculated results between original SGM Plus™ designations and those obtained with the European new generation multiplexes.