X-STR decaplex study in the population of Imbabura-Ecuador

Abstract

X chromosome STR markers are a useful tool in population genetics, they provide supplementary information for forensic and kinship analysis where autosomal and Y chromosome information is not enough. A total of 100 unrelated individuals from Imbabura-Ecuador were genotyped using the X-STR Decaplex system (DXS8378, DXS9902, DXS7132, DXS9898, DXS6809, DXS6789, DXS7133, GATA172D05, GATA31E08, and DXS7423). Allele frequencies and population parameters were calculated for each STR. The most informative marker was DXS6809 and the least informative was DXS7133. High discrimination power values were obtained (greater than 99.99%), as well as high mean exclusion chance in trios (mother / daughter / father) 0.9999948011 and duos (father/daughter) 0.9992880836. The genetic distance (F ST ) obtained comparing the Ecuadorian population and the Pichincha province population show low genetic distances. The data analyzed confirmed the potential of these 10 X-STRs.