Fertilization in Invertebrates

Schatten, Heide

doi:10.1007/978-3-642-58301-8_2

Cited by 4 publications

(1 citation statement)

References 269 publications

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“…Although sexual systems have diversified extensively within the fungal clade [17], sex in animals has remained relatively consistent [18] suggesting that choanoflagellates could shed light on ancestral sexual systems in Opisthokonta, the clade that includes animals, choanoflagellates, and fungi. Morphologically, the fusion of flagellated, anisogamous gametes in choanoflagellates bears a striking resemblance to the flagellated, anisogamous gametes of Allomyces macrogynus , a basal-branching fungal species [19, 20].…”

Section: Resultsmentioning

confidence: 99%

Evidence for Sex and Recombination in the Choanoflagellate Salpingoeca rosetta

2013

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Summary Nearly all animals reproduce sexually through the production and fusion of sperm and egg cells, yet little is known about the ancestry of animal sexual reproduction. Moreover, the sexual cycle of the closest living relatives of animals, the choanoflagellates [1, 2], remains completely unknown. The choanoflagellate Monosiga brevicollis, possesses a “meiotic toolkit” of genes [3], but the lack of polymorphisms detected during genome sequencing precluded inferences about its ploidy or sexual cycle [1]. Here we report that a related choanoflagellate, Salpingoeca rosetta [4, 5], has a sexual life cycle and transitions between haploid and diploid states. Haploid cultures of S. rosetta became diploid in response to nutrient limitation. This ploidy shift coincided with anisogamous mating, during which small, flagellated cells fused with larger flagellated cells. Distributions of polymorphisms in laboratory strains of S. rosetta provided independent evidence of historical recombination and mating. The ability of S. rosetta to produce morphologically differentiated gametes and to engage in sexual reproduction has implications both for reconstructing the evolution of sex in the progenitors of animals and for establishing classical genetics in choanoflagellates.

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Section: Resultsmentioning

confidence: 99%

Evidence for Sex and Recombination in the Choanoflagellate Salpingoeca rosetta

2013

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Universality and Diversity of a Fast, Electrical Block to Polyspermy During Fertilization in Animals

Iwao

Izaki

2018

Diversity and Commonality in Animals

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Ultrastructure of spermatozoa in the seminal receptacle of the liver fluke Opisthorchis felineus (Rivolta, 1884)

2014

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The spermatozoon ultrastructure in the seminal receptacle of the liver fluke Opisthorchis felineus (Digenea, Opisthorchiidae), the agent of human opisthorchiasis endemic to Russia and Eastern Europe, was examined. The bean-shaped seminal receptacle of O. felineus has a wall consisting of epithelial and muscle layers. Mature spermatozoa are located in the interior of the seminal receptacle, whereas vacuoles containing degenerating spermatozoa are detectable at the periphery. The mature spermatozoon of O. felineus has two axonemes of a 9 + "1" pattern, a nucleus, two mitochondria, a lamellar body, two bundles of parallel cortical microtubules and an external ornamentation of the plasma membrane in the anterior area of the sperm. The lamellar body is likely to be the third mitochondrion of a small size. The cytoplasm of the spermatozoon is filled with numerous electron-dense granules of storage polysaccharides. Additionally, the ultrastructural characteristics of the seminal receptacle and spermatozoa of O. felineus were compared to available published data on other trematode species. The functional roles of the observed structures of this spermatozoon are discussed.

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Fertilization in Invertebrates

Cited by 4 publications

References 269 publications

Evidence for Sex and Recombination in the Choanoflagellate Salpingoeca rosetta

Evidence for Sex and Recombination in the Choanoflagellate Salpingoeca rosetta

Universality and Diversity of a Fast, Electrical Block to Polyspermy During Fertilization in Animals

Ultrastructure of spermatozoa in the seminal receptacle of the liver fluke Opisthorchis felineus (Rivolta, 1884)

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