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How admixed captive breeding populations could be rescued using local ancestry information
Daniel J Lawson1, Jo Howard-McCombe2, Mark Beaumont3
1Institute of Statistical Sciences, School of Mathematics, University of Bristol, Bristol, UK.
Molecular Ecology
|April 18, 2024
Summary
Genomic information can reverse extinction from genetic swamping. Whole genome sequencing and advanced ancestry estimation enable captive breeding programs to remove introgressed DNA, preserving target species.
Area of Science:
- Conservation genetics
- Genomics
- Population genetics
Background:
- Genetic swamping threatens species with extinction.
- Hybridization with more numerous populations introduces foreign DNA.
- Genomic tools are crucial for modern conservation efforts.
Purpose of the Study:
- To determine if genomic information can facilitate species recovery from genetic swamping.
- To develop a breeding strategy for removing introgressed DNA in conservation programs.
Main Methods:
- Utilizing whole genome sequencing to identify introgressed DNA segments.
- Implementing a breeding strategy based on local ancestry, kinship, and heterozygosity.
- Applying computational advances for ancestry estimation.
- Simulating breeding populations and analyzing real data from the Scottish wildcat.
Main Results:
- A breeding strategy can effectively identify and remove introgressed DNA segments.
- Optimizing kinship and heterozygosity measures minimizes undesired ancestry.
- The method is feasible for real-world conservation, as shown with Scottish wildcats.
- Reversing introgression is possible by breeding out domestic cat ancestry.
Conclusions:
- Genomic information combined with advanced computation offers a powerful tool to reverse genetic introgression.
- Early application of this strategy is critical for successful species recovery.
- Decisions on which populations to conserve require careful consideration of genetic distinctiveness and potential for natural reformation.
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