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01.03.2018 | Population Data | Ausgabe 5/2018

International Journal of Legal Medicine 5/2018

Forensic parameters and admixture in Mestizos from five geographic regions of Mexico based on 20 autosomal STRs (Powerplex 21 system)

Zeitschrift:
International Journal of Legal Medicine > Ausgabe 5/2018
Autoren:
J. A. Aguilar-Velázquez, G. Martínez-Cortés, A. Inclán-Sánchez, A. F. Favela-Mendoza, J. S. Velarde-Félix, H. Rangel-Villalobos
Wichtige Hinweise

Electronic supplementary material

The online version of this article (https://​doi.​org/​10.​1007/​s00414-018-1810-z) contains supplementary material, which is available to authorized users.

Abstract

We analyzed Mestizo (admixed) population samples from different geographic regions of Mexico (n = 1283) with 20 autosomal STRs (PowerPlex® 21, Promega Corp.). Allele frequencies and forensic parameters from the Northwest, Northeast, West, Center, and Southeast regions are reported, as well as from the pooled Mexican population sample. The combined PD and PE for this 20 STR system were > 0.9999999999 and > 0.99999996593% in all five population samples, respectively. Analysis of molecular variance (AMOVA) of these Mexican population samples, plus Monterrey (Northeast) and Mexico (Center) Cities, showed low but significant differences among Mexican-Mestizos from the seven populations (Fst = 0.20%; p = 0.0000). Structure analysis showed the highest proportion of Native American ancestry in Mexico City, Center, and Southeast regions, respectively, which was in agreement with the estimated genetic distances represented in a MDS plot and a NJ tree. The best fit of population clusters (K = 4) obtained with the Structure software indicates that Mexican-Mestizos are mainly composed by European, African, and two Native American ancestries. The European and Native American ancestries displayed a contrary gradient, increasing toward the North-West and South-Southeast, respectively. These 20 autosomal STR loci improved the admixture estimation regarding previous studies with the 13 CODIS-STRs, as supported by the higher similarity with previous estimates based on genome-wide SNP. In brief, this study validates the confident use of the PowerPlex® 21 system for human identification purposes in Mestizo populations throughout the Mexican territory.

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Zusatzmaterial
High resolution image (TIFF 1173 kb)
414_2018_1810_MOESM1_ESM.tiff
Supplementary Table S1 (DOCX 19 kb)
414_2018_1810_MOESM2_ESM.docx
Supplementary Table S2 (XLSX 261 kb)
414_2018_1810_MOESM3_ESM.xlsx
Supplementary Table S3 (XLSX 63 kb)
414_2018_1810_MOESM4_ESM.xlsx
Supplementary Table S4 (XLSX 11 kb)
414_2018_1810_MOESM5_ESM.xlsx
Supplementary Table S5 (DOCX 17.6 kb)
414_2018_1810_MOESM6_ESM.docx
Literatur
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