Variation of the meiotic recombination landscape and properties over a broad evolutionary distance in yeasts

PLoS Genet. 2017 Aug 1;13(8):e1006917. doi: 10.1371/journal.pgen.1006917. eCollection 2017 Aug.

Abstract

Meiotic recombination is a major factor of genome evolution, deeply characterized in only a few model species, notably the yeast Saccharomyces cerevisiae. Consequently, little is known about variations of its properties across species. In this respect, we explored the recombination landscape of Lachancea kluyveri, a protoploid yeast species that diverged from the Saccharomyces genus more than 100 million years ago and we found striking differences with S. cerevisiae. These variations include a lower recombination rate, a higher frequency of chromosomes segregating without any crossover and the absence of recombination on the chromosome arm containing the sex locus. In addition, although well conserved within the Saccharomyces clade, the S. cerevisiae recombination hotspots are not conserved over a broader evolutionary distance. Finally and strikingly, we found evidence of frequent reversal of commitment to meiosis, resulting in return to mitotic growth after allele shuffling. Identification of this major but underestimated evolutionary phenomenon illustrates the relevance of exploring non-model species.

MeSH terms

  • Chromosomes, Fungal / genetics
  • DNA, Fungal / genetics
  • Evolution, Molecular
  • Genome, Fungal*
  • Homologous Recombination*
  • Meiosis / genetics*
  • Mitosis / genetics
  • Phylogeny
  • Proton-Translocating ATPases / genetics
  • Proton-Translocating ATPases / metabolism
  • Saccharomyces cerevisiae / genetics*
  • Saccharomyces cerevisiae Proteins / genetics
  • Saccharomyces cerevisiae Proteins / metabolism
  • Saccharomycetales / classification
  • Saccharomycetales / genetics*
  • Sequence Analysis, DNA

Substances

  • DNA, Fungal
  • Saccharomyces cerevisiae Proteins
  • Proton-Translocating ATPases
  • VMA1 protein, S cerevisiae

Grants and funding

This work was supported by grants from the Agence Nationale de la Recherche (ANR): grant 2013-13-BSV6-0012-01 to BL, and grant ANR-16-CE12-0019 to JS. We also thank the University of Strasbourg Institute for Advanced Study (USIAS) for their financial support. JS is a member of the Institut Universitaire de France. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.