Graph-based pangenome analysis uncovers structural and functional impacts of allopolyploidization events.

Allopolyploid Brettanomyces bruxellensis genomes contain substantially more structural variants than diploids, averaging 320 versus 116 SVs, within a graph pangenome of 1060 isolates.

• Why it matters: Complex ploidy is linked to poorly characterized changes in structural-variant landscapes, limiting understanding of how allopolyploidization reshapes genome structure and gene regulation.
• What they did: The study built a reference graph pangenome from subgenome-resolved assemblies and population-scale genomic and transcriptomic data, identifying 5972 unique SVs and testing SV–expression associations.
• The result: SVs influence gene expression for 27.5% of variants, and hybridization-associated SV hotspots disproportionately affect expression with larger effect sizes than other SVs.

AI summary of the abstract · may contain errors · not medical advice · read the paper.