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Updated: May 8, 2026
06:18
Optimized Bone Sampling Protocols for the Retrieval of Ancient DNA from Archaeological Remains
Published on: November 30, 2021
Optimal Reference Panel Design in Ancient DNA Imputation from Coalescent Theory, Simulation, and Real Data
Bárbara Sousa da Mota1,2, Kiran H Kumar3,4, David Reich2,1,5,6
1Department of Human Evolutionary Biology, Harvard University, Cambridge, MA, USA.
Biorxiv : the Preprint Server for Biology
|May 7, 2026
Summary
Imputing ancient DNA (aDNA) is improved by including ancient genomes in reference panels. This approach enhances the accuracy of rare variant imputation, crucial for understanding ancient human history and genetics.
Area of Science:
- Genetics
- Bioinformatics
- Paleogenomics
Background:
- Imputation is vital in ancient DNA (aDNA) research for inferring traits, studying selection, and identifying shared genomic segments.
- Current imputation methods struggle with rare variants, often excluding them from analyses.
- Optimal reference panels for aDNA imputation remain undefined, despite the potential benefits of ancient-specific panels.
Purpose of the Study:
- To evaluate the performance of modern reference panels for aDNA imputation.
- To assess the impact of including ancient genomes in reference panels on imputation accuracy.
- To determine optimal strategies for aDNA imputation, especially for rare variants.
Main Methods:
- Utilized coalescent theory and simulations to analyze imputation performance.
- Compared imputation accuracy using large modern panels versus panels augmented with ancient genomes.
- Assembled and tested a joint reference panel combining 1000 Genomes data with 95 ancient samples.
Main Results:
- Modern panel imputation performance saturates with sample sizes around 5,000.
- Model misspecifications in imputation algorithms increase errors for rare and intermediate frequency variants.
- Including ancient genomes significantly improved imputation accuracy, particularly for rare variants and ancient samples from low-population-size groups.
Conclusions:
- A threshold of 2% derived allele frequency is recommended for filtering imputed variants in European hunter-gatherers.
- Joint reference panels incorporating ancient genomes offer modest but valuable gains in imputation performance.
- This strategy can recover rare variants often lost in current imputation pipelines, with increasing utility as more ancient samples become available.
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