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Inference of recent admixture using genotype data
Peter Pfaffelhuber1, Elisabeth Sester-Huss1, Franz Baumdicker2
1Institute for Mathematics, University of Freiburg, Ernst-Zermelo-Str. 1, 79104 Freiburg, Germany.
Forensic Science International. Genetics
|November 4, 2021
Summary
Forensic genetics can misinfer biogeographic ancestry (BGA) due to recent admixture. New methods estimating parental individual ancestry (PIA) improve accuracy in these cases, aiding forensic investigations.
Area of Science:
- Forensic genetics
- Population genetics
- Human genomics
Background:
- Biogeographic ancestry (BGA) inference is crucial in forensic genetics.
- Misinference of BGA can lead to significant negative consequences in legal investigations and for society.
- Recent admixture poses a challenge to accurate BGA estimation.
Purpose of the Study:
- To investigate the impact of recent admixture on BGA inference using advanced tools.
- To develop and evaluate improved methods for estimating individual and parental ancestry.
- To introduce a statistical test for detecting recent admixture.
Main Methods:
- Utilized simulations and the 1000 Genomes Project dataset.
- Analyzed real-world data from two individuals using the ForenSeq DNA Signature Prep Kit.
- Extended existing individual ancestry (IA) estimation tools to parental individual ancestry (PIA) estimation.
Main Results:
- Recent admixture can cause misclassification and inaccurate ancestry proportion inference.
- Parental individual ancestry (PIA) estimation outperforms traditional IA in scenarios with recent admixture.
- Developed a statistical test to identify recent admixture events.
Conclusions:
- The developed PIA method enhances the accuracy of ancestry estimation in admixed populations.
- PIA provides valuable supplementary information for forensic casework, potentially guiding investigations.
- Accurate BGA inference is critical for the reliable application of forensic genetics.
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