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

Evolution; International Journal of Organic Evolution
Anne VielleChristian Braendle

Abstract

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 hypo...Continue Reading

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Nov 23, 2017·G3 : Genes - Genomes - Genetics·Katja R Kasimatis, Patrick C Phillips
Sep 7, 2019·Genetics·Asher D CutterPatrick C Phillips
Aug 20, 2020·BMC Evolutionary Biology·Caroline LaunayMarie Delattre
Aug 10, 2019·Genetics·Clotilde GimondChristian Braendle

Related Concepts

Metazoa
Caenorhabditis
Y-Chromosome-Bearing Sperm
Variation (Genetics)
Evolution, Molecular
Cell Volume
Caenorhabditis
Biological Evolution
Ovum
Spermatocytes

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