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Chromosomal evolution in Saccharomyces

Author

Listed:
  • G. Fischer

    (University of Oxford)

  • S. A. James

    (National Collection of Yeast Cultures, Institute of Food Research)

  • I. N. Roberts

    (National Collection of Yeast Cultures, Institute of Food Research)

  • S. G. Oliver

    (School of Biological Sciences, University of Manchester, 2.205 Stopford Building)

  • E. J. Louis

    (University of Oxford)

Abstract

The chromosomal speciation model invokes chromosomal rearrangements as the primary cause of reproductive isolation1. In a heterozygous carrier, chromosomes bearing reciprocal translocations mis-segregate at meiosis, resulting in reduced fertility or complete sterility. Thus, chromosomal rearrangements act as a post-zygotic isolating mechanism. Reproductive isolation in yeast is due to post-zygotic barriers, as many species mate successfully but the hybrids are sterile2,3. Reciprocal translocations are thought to be the main form of large-scale rearrangement since the hypothesized duplication of the whole yeast genome 108 years ago4,5. To test the chromosomal speciation model in yeast, we have characterized chromosomal translocations among the genomes of six closely related species in the Saccharomyces ‘sensu stricto’ complex6. Here we show that rearrangements have occurred between closely related species, whereas more distant ones have colinear genomes. Thus, chromosomal rearrangements are not a prerequisite for speciation in yeast and the rate of formation of translocations is not constant. These rearrangements appear to result from ectopic recombination between Ty elements or other repeated sequences.

Suggested Citation

  • G. Fischer & S. A. James & I. N. Roberts & S. G. Oliver & E. J. Louis, 2000. "Chromosomal evolution in Saccharomyces," Nature, Nature, vol. 405(6785), pages 451-454, May.
    • Handle: RePEc:nat:nature:v:405:y:2000:i:6785:d:10.1038_35013058
    DOI: 10.1038/35013058
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    Cited by:

    1. Simone Mozzachiodi & Lorenzo Tattini & Agnes Llored & Agurtzane Irizar & Neža Škofljanc & Melania D’Angiolo & Matteo De Chiara & Benjamin P. Barré & Jia-Xing Yue & Angela Lutazi & Sophie Loeillet & Ra, 2021. "Aborting meiosis allows recombination in sterile diploid yeast hybrids," Nature Communications, Nature, vol. 12(1), pages 1-13, December.
    2. David Peris & Emily J. Ubbelohde & Meihua Christina Kuang & Jacek Kominek & Quinn K. Langdon & Marie Adams & Justin A. Koshalek & Amanda Beth Hulfachor & Dana A. Opulente & David J. Hall & Katie Hyma , 2023. "Macroevolutionary diversity of traits and genomes in the model yeast genus Saccharomyces," Nature Communications, Nature, vol. 14(1), pages 1-19, December.

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