TY - JOUR U1 - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed) A1 - Theunissen, Glenn M. G. A1 - Gibb, Andrew A1 - Kong Thoo Lin, Paul A1 - Rolf, Burkhard A1 - Forat, Sophia A1 - Jäger, Richard T1 - DNA profiling of single sperm cells after whole genome amplification JF - Forensic Science International: Reports N2 - Intimate swabs taken for examination in sexual assault cases typically yield mixtures of sperm and epithelial cell types. While powerful, differential extraction protocols to overcome such cell type mixtures by separate lysis of epithelial cells and spermatozoa can still prove ineffective, in particular if only few sperm cells are present or if swabs contain sperm from more than one individual leading to complex low level DNA mixtures. A means to avoid such mixtures consists in the analysis of single micromanipulated sperm cells. However, the quantity of DNA from single sperm cells is not sufficient for conventional STR analysis. Here, we describe a simple method for micromanipulating individual sperm cells from intimate swabs and show that whole genome amplification can generate sufficient amounts of DNA from single cells for subsequent DNA profiling. We recovered over 80% of alleles of haploid autosomal STR profiles from the majority of individual sperm cells. Furthermore, we demonstrate that in mixtures of sperm from two contributors, Y-STR and X-STR profiles of individual sperm cells can be used to sort the haploid autosomal profiles to develop the diploid consensus STR profiles of the individual donors. Finally, by analysing single sperm cells from mock sexual assault swabs with one or two sperm donors, we showed that our protocols enabled the identification of the unknown male contributors. KW - X-STR KW - sperm cell KW - Forensic genetics KW - micromanipulation KW - sexual assault KW - Short tandem repeat (STR) KW - Y-STR KW - Whole genome amplification KW - DNA typing UN - https://nbn-resolving.org/urn:nbn:de:hbz:1044-opus-59674 SN - 2665-9107 SS - 2665-9107 U6 - https://doi.org/10.1016/j.fsir.2021.100240 DO - https://doi.org/10.1016/j.fsir.2021.100240 VL - 4 SP - 10 S1 - 10 PB - Elsevier ER -