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Ghost Introgression: Spooky Gene Flow in the Distant Past
Jente Ottenburghs1,2,3
1Department of Evolutionary Biology, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18D, Uppsala, SE-752 36, Sweden.
Summary
Ghost introgression, genetic signatures from extinct lineages, are detectable in modern genomes. This reticulated evolutionary history impacts our understanding of adaptation and speciation.
Area of Science:
- Evolutionary Biology
- Genomics
- Paleontology
Background:
- Evolutionary history is marked by extinction, with many extinct lineages closely related to extant species.
- Hybridization between extinct and extant lineages can leave genetic traces in present-day genomes, termed ghost introgression.
Purpose of the Study:
- To highlight the significance of ghost introgression in evolutionary studies.
- To emphasize the potential of genomic data to reveal insights into extinct lineages.
Main Methods:
- Analysis of high-quality genome assemblies for non-model organisms.
- Development and application of sophisticated methods for detecting ancient introgression events.
Main Results:
- Genetic signatures of ancient introgression events (ghost introgression) are likely present in extant genomes.
- The Tree of Life is more reticulated than previously assumed due to these introgression events.
Conclusions:
- Ghost introgression has significant implications for understanding adaptation, speciation, and macroevolutionary patterns.
- Studying introgressed regions can offer insights into extinct lineage morphology, bridging genomics and the fossil record.
- New methodologies are required to effectively incorporate ghost introgression into evolutionary analyses.
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