The Brassica oleracea genome reveals the asymmetrical evolution of polyploid genomes
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Abstract
Polyploidization has provided much genetic variation for plant adaptive evolution, but the mechanisms by which the molecular evolution of polyploid genomes establishes genetic architecture underlying species differentiation are unclear. Brassica is an ideal model to increase knowledge of polyploid evolution. Here we describe a draft genome sequence of Brassica oleracea, comparing it with that of its sister species B. rapa to reveal numerous chromosome rearrangements and asymmetrical gene loss in duplicated genomic blocks, asymmetrical amplification of transposable elements, differential gene co-retention for specific pathways and variation in gene expression, including alternative splicing, among a large number of paralogous and orthologous genes. Genes related to the production of anticancer phytochemicals and morphological variations illustrate consequences of genome duplication and gene divergence, imparting biochemical and morphological variation to B. oleracea. This study provides insights into Brassica genome evolution and will underpin research into the many important crops in this genus. Brassica oleracea is plant species comprising economically important vegetable crops. Here, the authors report the draft genome sequence of B. oleracea and, through a comparative analysis with the closely related B. rapa, reveal insights into Brassicaevolution and divergence of interspecific genomes and intraspecific subgenomes.
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The record
- Venue
- Nature Communications
- Topic
- Chromosomal and Genetic Variations
- Field
- Agricultural and Biological Sciences
- Canadian institutions
- National Research Council CanadaSaskatchewan Research Council (Canada)Agriculture and Agri-Food Canada
- Funders
- National Key Research and Development Program of ChinaSpecial Fund for Agro-scientific Research in the Public InterestAustralian Research CouncilBiotechnology and Biological Sciences Research CouncilDirectorate for Biological SciencesNational Natural Science Foundation of ChinaNational Science Foundation
- Keywords
- BiologyBrassica oleraceaPolyploidGenomeGenome evolutionBrassica rapaGenome sizeGeneticsGenePloidyGene duplicationTandem exon duplicationTransposable elementPlant evolutionEvolutionary biologyBotany
- Has abstract in OpenAlex
- yes