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Low variability in a Y-linked plant gene and its implications for Y-chromosome evolution

Nature volume 404, pages 388–390 (2000)Cite this article

Abstract

Sex chromosomes have evolved independently in several different groups of organisms, but they share common features, including genetic degeneration of the Y chromosome1,2. Suppression of recombination between ancestral proto-X and proto-Y chromosomes is thought to have led to their gradual divergence, and to degeneration of the Y chromosome2, but the evolutionary forces responsible are unknown. In non-recombining Y chromosomes, deleterious mutations may be carried to fixation by linked advantageous mutations (“selective sweeps”)3. Occurrence of deleterious mutations may drive “Muller's ratchet” (stochastic loss of chromosomes with the fewest mutations)2,4. Selective elimination of deleterious mutations, causing “background selection”5,6 may accelerate stochastic fixation of mildly detrimental mutations2. All these processes lower effective population sizes, and therefore reduce variability of genes in evolving Y chromosomes. We have studied DNA diversity and divergence in a recently described X- and Y-linked gene pair7 (SLX-1 and SLY-1) of the plant Silene latifolia to obtain evidence about the early stages of Y degeneration. Here we show that DNA polymorphism in SLY-1 is 20-fold lower than in SLX-1, but the pattern of polymorphism does not suggest a selective sweep.

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Figure 1: Location of the 2-kb 3′ region of the SLX-1 and SLY-1 genes sequenced in this study.
Figure 2: Phylogenetic neighbour-joining tree for a 2-kb region of SLY-1 and SLX-1, constructed using 12 sequences of each of the X- and Y-linked alleles.

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Acknowledgements

We thank M. Turelli and B. Charlesworth for discussions and advice. D.C. was supported by the Natural Environment Research Council of Great Britain, D.A.F. by a grant from the Leverhulme Trust, and F.M. and I.N. by research contracts from the Centre National de la Recherche Scientifique, the Institut National de la Recherche Agrononique and the Ecole Normale Supérieure of France.

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Authors and Affiliations

  1. Institute of Cell, Animal, and Population Biology, University of Edinburgh, Edinburgh, EH9 3JT, UK

    Dmitry A. Filatov & Deborah Charlesworth

  2. Ecole Normale Supérieure de Lyon, UMR 5667 CNRS/INRA/ENS/Lyon I, 46 Allée d’Italie, Lyon, 69364, France

    Françoise Monéger & Ioan Negrutiu

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  1. Dmitry A. Filatov
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  4. Deborah Charlesworth
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Correspondence to Deborah Charlesworth.

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Filatov, D., Monéger, F., Negrutiu, I. et al. Low variability in a Y-linked plant gene and its implications for Y-chromosome evolution. Nature 404, 388–390 (2000). https://doi.org/10.1038/35006057

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