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Yosemite toad (Anaxyrus canorus) transcriptome reveals interplay between speciation genes and adaptive introgression
Paul A Maier1,2, Amy G Vandergast3, Andrew J Bohonak1
1Department of Biology, San Diego State University, San Diego, California, USA.
Molecular Ecology
|March 15, 2024
Summary
Genomic islands of divergence and genomic rivers of introgression show overlap in location and function during speciation. Some loci transition from islands to rivers, highlighting complementary roles in adaptive divergence.
Area of Science:
- Evolutionary biology
- Genomics
- Speciation research
Background:
- Genomes exhibit heterogeneity during early speciation, with 'islands' of divergence and 'rivers' of introgression.
- Genomic islands are linked to reproductive isolation, while rivers facilitate adaptive introgression of beneficial alleles.
Purpose of the Study:
- To investigate the overlap and predictability of genomic islands and rivers in secondary contact zones.
- To determine if adaptive loci for tadpole development are islands, rivers, or neither.
Main Methods:
- Analysis of three Yosemite toad (Anaxyrus canorus) contact zones using genomic and morphometric data.
- Genome-wide association studies (GWAS) and gene ontology enrichment analysis.
Main Results:
- Significant overlap observed between island and river loci within contact zones.
- Gene ontology analysis revealed conserved functions unique to island loci.
- The lipid metabolism gene LPIN3 was identified as island-like and introgressing (river-like) in some zones.
Conclusions:
- Adaptive divergence and introgression are complementary evolutionary forces.
- Some genomic loci can transition from islands of divergence to rivers of introgression.
- Predictable gene pathways are associated with genomic islands during speciation.
Keywords:
adaptive introgressionadmixturegenomic islands of divergencehybridizationreproductive isolationtranscriptomeMore Related Videos
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