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Convergent evolution of sperm gigantism and the developmental origins of sperm size variability in Caenorhabditis nematodes

Vielle, Anne ; Callemeyn-Torre, Nicolas ; Gimond, Clotilde ; Poullet, Nausicaa ; Gray, Jeremy C. ; Cutter, Asher D. ; Braendle, Christian

Evolution, 2016-11, Vol.70 (11), p.2485-2503 [Periódico revisado por pares]

United States: Blackwell Publishing Ltd

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  • Título:
    Convergent evolution of sperm gigantism and the developmental origins of sperm size variability in Caenorhabditis nematodes
  • Autor: Vielle, Anne ; Callemeyn-Torre, Nicolas ; Gimond, Clotilde ; Poullet, Nausicaa ; Gray, Jeremy C. ; Cutter, Asher D. ; Braendle, Christian
  • Assuntos: Animals ; Anisogamy ; Caenorhabditis ; Caenorhabditis - cytology ; Caenorhabditis - genetics ; Cell Size ; developmental evolution ; Evolution ; Evolution, Molecular ; Female ; Genetic Variation ; Life Sciences ; Male ; Nematoda ; Nematodes ; sexual selection ; Sperm ; sperm competition ; sperm size ; Spermatozoa - cytology
  • É parte de: Evolution, 2016-11, Vol.70 (11), p.2485-2503
  • Notas: Fondation ARC pour la recherche sur le cancer
    Agence Nationale de la Recherche
    Fondation Schlumberger pour l'Education et la Recherche
    France Canada Research Fund
    Natural Sciences and Engineering Research Council
    ark:/67375/WNG-QHKSR9JC-0
    ArticleID:EVO13043
    istex:5F2EA64ABE1EDA45D7CF7D4BC11D453853B740B4
    Canada Research Chair
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Sperm cells provide essential, if usually diminutive, ingredients to successful sexual reproduction. Despite this conserved function, sperm competition and coevolution with female traits can drive spectacular morphological change in these cells. Here, we characterize four repeated instances of convergent evolution of sperm gigantism in Caenorhabditis nematodes using phylogenetic comparative methods on 26 species. Species at the extreme end of the 50-fold range of sperm-cell volumes across the genus have sperm capable of comprising up to 5% of egg-cell volume, representing severe attenuation of the magnitude of anisogamy. Furthermore, we uncover significant differences in mean and variance of sperm size among genotypes, between sexes, and within and between individuals of identical genotypes. We demonstrate that the developmental basis of sperm size variation, both within and between species, becomes established during an early stage of sperm development at the formation of primary spermatocytes, while subsequent meiotic divisions contribute little further sperm size variability. These findings provide first insights into the developmental determinants of inter- and intraspecific sperm size differences in Caenorhabditis. We hypothesize that life history and ecological differences among species favored the evolution of alternative sperm competition strategies toward either many smaller sperm or fewer larger sperm.
  • Editor: United States: Blackwell Publishing Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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