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Cytonuclear interactions remain stable during allopolyploid evolution despite repeated whole-genome duplications in Brassica

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  • Julie Ferreira de Carvalho
  • Jeremy Lucas
  • Gwenaelle Deniot
  • Cyril Falentin
  • Olivier Filangi
  • Marie Gilet
  • Fabrice Legeal
  • Maryse Lode
  • Jerome Morice
  • Gwenn Trotoux
  • Jean-Marc Aury
  • Valerie Barbe
  • Jean Keller
  • Rod Snowdon
  • Zhesi He
  • France Denoeud
  • Patrick Wincker
  • Ian Bancroft
  • Anne-Marie Chevre
  • Mathieu Rosseau-Gueutin


Publication details

JournalThe Plant journal
DateAccepted/In press - 2 Jan 2019
DateE-pub ahead of print - 3 Jan 2019
DatePublished (current) - 1 May 2019
Issue number3
Number of pages14
Pages (from-to)434-447
Early online date3/01/19
Original languageEnglish


Several plastid macromolecular protein complexes are encoded by both nuclear and plastid genes. Therefore, cytonuclear interactions are held in place to prevent genomic conflicts that may lead to incompatibilities. Allopolyploidy resulting from hybridization and genome doubling of two divergent species can disrupt these fine-tuned interactions, as newly formed allopolyploid species confront biparental nuclear chromosomes with a uniparentally inherited plastid genome. To avoid any deleterious effects of unequal genome inheritance, preferential transcription of the plastid donor over the other donor has been hypothesized to occur in allopolyploids. We used Brassica as a model to study the effects of paleopolyploidy in diploid parental species, as well as the effects of recent and ancient allopolyploidy in Brassica napus, on genes implicated in plastid protein complexes. We first identified redundant nuclear copies involved in those complexes. Compared with cytosolic protein complexes and with genome-wide retention rates, genes involved in plastid protein complexes show a higher retention of genes in duplicated and triplicated copies. Those redundant copies are functional and are undergoing strong purifying selection. We then compared transcription patterns and sequences of those redundant gene copies between resynthesized allopolyploids and their diploid parents. The neopolyploids showed no biased subgenome expression or maternal homogenization via gene conversion, despite the presence of some non-synonymous substitutions between plastid genomes of parental progenitors. Instead, subgenome dominance was observed regardless of the maternal progenitor. Our results provide new insights on the evolution of plastid protein complexes that could be tested and generalized in other allopolyploid species.

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© 2019 John Wiley & Sons, Inc. All rights reserved. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.

    Research areas

  • Brassica napus, Brassica oleracea, Brassica rapa, allopolyploidy, chloroplast, duplicated genes, genome inheritance, intergenomic conflicts, interspecific hybridization

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