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Journal article
Cytonuclear Interactions and Subgenome Dominance Shape the Evolution of Organelle-Targeted Genes in the Brassica Triangle of U
Molecular biology and evolution, Vol.41(3), msae043
2024
PMID: 38391484
Abstract
The interaction and coevolution between nuclear and cytoplasmic genomes are one of the fundamental hallmarks of eukaryotic genome evolution and, 2 billion yr later, are still major contributors to the formation of new species. Although many studies have investigated the role of cytonuclear interactions following allopolyploidization, the relative magnitude of the effect of subgenome dominance versus cytonuclear interaction on genome evolution remains unclear. The Brassica triangle of U features 3 diploid species that together have formed 3 separate allotetraploid species on similar evolutionary timescales, providing an ideal system for understanding the contribution of the cytoplasmic donor to hybrid polyploid. Here, we investigated the evolutionary pattern of organelle-targeted genes in Brassica carinata (BBCC) and 2 varieties of Brassica juncea (AABB) at the whole-genome level, with particular focus on cytonuclear enzyme complexes. We found partial evidence that plastid-targeted genes experience selection to match plastid genomes, but no obvious corresponding signal in mitochondria-targeted genes from these 2 separately formed allopolyploids. Interestingly, selection acting on plastid genomes always reduced the retention rate of plastid-targeted genes encoded by the B subgenome, regardless of whether the Brassica nigra (BB) subgenome was contributed by the paternal or maternal progenitor. More broadly, this study illustrates the distinct selective pressures experienced by plastid- and mitochondria-targeted genes, despite a shared pattern of inheritance and natural history. Our study also highlights an important role for subgenome dominance in allopolyploid genome evolution, even in genes whose function depends on separately inherited molecules.
Details
- Title
- Cytonuclear Interactions and Subgenome Dominance Shape the Evolution of Organelle-Targeted Genes in the Brassica Triangle of U
- Authors/Creators
- Shenglong Kan - Agricultural Genomics Institute at ShenzhenXuezhu Liao - Agricultural Genomics Institute at ShenzhenLan Lan - Agricultural Genomics Institute at ShenzhenJiali Kong - Henan UniversityJie Wang - Murdoch UniversityLiyun Nie - Agricultural Genomics Institute at ShenzhenJun Zou - Huazhong Agricultural UniversityHong An - University of MissouriZhiqiang Wu - Agricultural Genomics Institute at Shenzhen
- Publication Details
- Molecular biology and evolution, Vol.41(3), msae043
- Publisher
- Oxford University Press on behalf of Society for Molecular Biology and Evolution
- Identifiers
- 991005652869307891
- Copyright
- © The Author(s) 2024.
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
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