Abstract
Single-nucleotide polymorphisms (SNPs) found within the non-recombining region of the Y chromosome (NRY) represent a powerful tool in forensic genetics for inferring the paternal ancestry of a vestige and complement the determination of biogeographical origin in combination with other markers like AIMs. In the present study, we introduce a panel of 15 Y-SNPs for a fine-resolution subtyping of the haplogroup R1b-DF27, in a single minisequencing reaction. This is the first minisequencing panel that allows a fine subtyping of R1b-DF27, which displays high frequencies in Iberian and Iberian-influenced populations. This panel includes subhaplogroups of DF27 that display moderate geographical differentiation, of interest to link a sample with a specific location of the Iberian Peninsula or with Iberian ancestry. Conversely, part of the intricacy of a new minisequencing panel is to have all the included variants available to test the effectiveness of the analysis method. We have overcome the absence of the least common variants through site-directed mutagenesis. Overall, the results show that our panel is a robust and effective method for subtyping R1b-DF27 lineages from a minimal amount of DNA, and its high resolution enables to improve male lineage discrimination in Iberian and Southwest European descent individuals. The small length of the amplicons and its reproducibility makes this assay suitable for forensic and population genetics purposes.
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Acknowledgements
The authors are grateful to PhD Maite Álvarez for her human and technical assistance provided on the DNA Bank Service (SGIker) of the University of the Basque Country UPV/EHU (European funding: ERDF and ESF), as well as to the Basque Foundation of Science (BIOEF), and to all the people who voluntarily participated in this study.
Funding
Funds were provided by the Basque Government (IT-424-07 and IT-833-13). During the execution of this study, Patricia Villaescusa was granted with a predoctoral fellowship by the University of the Basque Country UPV/EHU and Leire Palencia-Madrid with a postdoctoral fellowship by the University of the Basque Country UPV/EHU.
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Electronic supplementary material
Supplementary Fig. S1
Phylogenetic tree of the Y-SNPs included in the 15-plex minisequencing panel (PNG 18.1 kb)
Supplementary Fig. S2
Electropherogram obtained during the optimization of the 15-plex minisequencing assay, where spurious peaks and pull-ups (circled) can be observed (PNG 11.1 kb)
Supplementary Fig. S3
Diagram of the theoretical positions of the Y-SNPs included in the 15-plex minisequencing panel. Ancestral alleles appear in bold letters; Derived alleles appear underlined (PNG 38.4 kb)
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Villaescusa, P., Palencia-Madrid, L., Campaner, M.A. et al. Effective resolution of the Y chromosome sublineages of the Iberian haplogroup R1b-DF27 with forensic purposes. Int J Legal Med 133, 17–23 (2019). https://doi.org/10.1007/s00414-018-1936-z
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DOI: https://doi.org/10.1007/s00414-018-1936-z