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Recombination rates in admixed individuals identified by ancestry-based inference
Daniel Wegmann1, Darren E Kessner, Krishna R Veeramah
1Department of Ecology and Evolutionary Biology, University of California, Los Angeles, California, USA.
Nature Genetics
|July 22, 2011
Summary
This study introduces a novel method for creating detailed recombination maps using ancestry switch points in admixed populations. The findings reveal population-specific recombination rate differences, particularly around structural variants.
Area of Science:
- Genetics
- Population Genetics
- Genomic Mapping
Background:
- Accurate recombination maps are essential for genetic studies.
- Understanding recombination rate variation is crucial for population genetics.
Purpose of the Study:
- To develop a new method for high-resolution recombination mapping using admixed individuals.
- To investigate fine-scale recombination rate differentiation between populations.
Main Methods:
- Utilized ancestry switch points in admixed individuals to infer recombination events.
- Applied the method to SNP genotype data from African Americans and African Caribbeans.
- Compared inferred maps with existing high-resolution maps from non-admixed populations.
Main Results:
- Successfully constructed high-resolution recombination maps from admixed populations.
- Detected several hundred thousand recombination events.
- Observed fine-scale differentiation in recombination rates between populations, especially near chromosomal structural variants like inversions.
Conclusions:
- The proposed method effectively maps recombination rates in admixed populations.
- Admixture generally does not disrupt recombination rate determinants, except in regions with significant structural variation.
- Recombination rates in admixed populations are largely predictable by source population rates and admixture proportions.
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