Multiple convergent supergene evolution events in mating-type chromosomes

Sara Branco, Fantin Carpentier, Ricardo C.Rodríguez De La Vega, Hélène Badouin, Alodie Snirc, Stéphanie Le Prieur, Marco A. Coelho, Damien M. De Vienne, Fanny E. Hartmann, Dominik Begerow, Michael E. Hood, Tatiana Giraud

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Convergent adaptation provides unique insights into the predictability of evolution and ultimately into processes of biological diversification. Supergenes (beneficial gene linkage) are striking examples of adaptation, but little is known about their prevalence or evolution. A recent study on anther-smut fungi documented supergene formation by rearrangements linking two key mating-type loci, controlling pre- and post-mating compatibility. Here further high-quality genome assemblies reveal four additional independent cases of chromosomal rearrangements leading to regions of suppressed recombination linking these mating-type loci in closely related species. Such convergent transitions in genomic architecture of mating-type determination indicate strong selection favoring linkage of mating-type loci into cosegregating supergenes. We find independent evolutionary strata (stepwise recombination suppression) in several species, with extensive rearrangements, gene losses, and transposable element accumulation. We thus show remarkable convergence in mating-type chromosome evolution, recurrent supergene formation, and repeated evolution of similar phenotypes through different genomic changes.

Original languageEnglish
Article number2000
JournalNature Communications
Volume9
Issue number1
DOIs
Publication statusPublished - 1 Dec 2018

Keywords

  • FUNGUS MICROBOTRYUM-VIOLACEUM
  • SEX-CHROMOSOME
  • MAXIMUM-LIKELIHOOD
  • SMUT FUNGI
  • ADAPTATION
  • PLANT
  • ALIGNMENT
  • INSIGHTS
  • LINKAGE
  • DNA

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    Branco, S., Carpentier, F., De La Vega, R. C. R., Badouin, H., Snirc, A., Le Prieur, S., ... Giraud, T. (2018). Multiple convergent supergene evolution events in mating-type chromosomes. Nature Communications, 9(1), [2000]. https://doi.org/10.1038/s41467-018-04380-9