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DTSTART:20190331T010000
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DTSTART:20191027T010000
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DTSTART;TZID=Europe/Paris:20190917T110000
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DTSTAMP:20260621T190050
CREATED:20190910T150423Z
LAST-MODIFIED:20190910T150423Z
UID:8423-1568718000-1568718000@ibv.unice.fr
SUMMARY:Laure Mignerot
DESCRIPTION:From Station Biologique de Roscoff \nwill give a seminar entitled: \nGenetic and cellular characterisation of parthenogenesis in the Brown alga Ectocarpus  \n  \nAbstract: \nAlthough sexual reproduction predominates in eukaryotes\, several hundred lineages have undergone the transition from sexuality to asexuality. Transitions between sexual and asexual reproduction are believed to have important evolutionary and ecological consequences\, yet the molecular\, genetic\, and cytological foundations of such transitions remain elusive. One type of asexual reproduction is parthenogenesis\, i.e.\, the development of an adult organism directly from gametes in the absence of fertilisation. Although many eukaryotes are capable of reproducing by parthenogenesis\, we know very little about its genetic basis\, and the evolutionary causes and consequences of transitions to asexuality are poorly understood. The brown algae are a group of multicellular eukaryotes\, that show an extraordinary diversity of types of life cycle\, sexual systems\, modes of reproduction\, and they provide excellent models to look at the origins\, evolution and mechanisms underlying parthenogenesis. In this study\, we have used a wide array of genomic and cell biology tools available for the model brown alga Ectocarpus to identify and characterize loci involved in parthenogenesis\, shedding light on the causes and consequences of parthenogenesis at the organism level. Our results highlight the key role of the sex chromosome as a major regulator of asexual reproduction\, together with two autosomal loci. Importantly\, we identify several negative effects of parthenogenesis on male fitness\, but also different fitness effects between parthenogenesis and life cycle generations\, supporting the idea that parthenogenesis may be under both sexual selection and generation/ploidally-antagonistic selection. Zygotic growth was significantly affected by the parthenogenetic capacity of the male parent and the putative role of mitochondrial inheritance patterns on the fitness of sporophytes was also investigated. \n  \n  \n  \n 
URL:http://ibv.unice.fr/event/laure-mignerot/
LOCATION:Salle de Conférences\, Centre de Biochimie\, 28 avenue Valrose\, Faculté des Sciences\, Parc Valrose\, Nice\, 06100\, France
CATEGORIES:Seminars
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