Serial endosymbiosis or singular event at the origin of eukaryotes?
نویسندگان
چکیده
منابع مشابه
Photosynthetic eukaryotes unite: endosymbiosis connects the dots.
The photosynthetic organelle of algae and plants (the plastid) traces its origin to a primary endosymbiotic event in which a previously non-photosynthetic protist engulfed and enslaved a cyanobacterium. This eukaryote then gave rise to the red, green and glaucophyte algae. However, many algal lineages, such as the chlorophyll c-containing chromists, have a more complicated evolutionary history ...
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Thirty years after Margulis revived the endosymbiosis theory for the origin of mitochondria and chloroplasts, two novel symbiosis hypotheses for the origin of eukaryotes have been put forward. Both propose that eukaryotes arose through metabolic symbiosis (syntrophy) between eubacteria and methanogenic Archaea. They also propose that this was mediated by interspecies hydrogen transfer and that,...
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The origin of the eukaryotic genetic apparatus is thought to be central to understanding the evolution of the eukaryotic cell. Disagreement about the source of the relevant genes has spawned competing hypotheses for the origins of the eukaryote nuclear lineage. The iconic rooted 3-domains tree of life shows eukaryotes and archaebacteria as separate groups that share a common ancestor to the exc...
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The eukaryotic cell appeared 2.7 Ga or earlier as a result of coevolution of prokaryotic components of Archean microbial communities. The crisis events at the Archean–Proterozoic boundary, which partially destroyed the Archean prokaryotic biota, may have played an important role in the development of the first eukaryotes. The separation of the nucleus from the cytosol and the presence of hetero...
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Numerous scenarios explain the origin of the eukaryote cell by fusion or endosymbiosis between an archaeon and a bacterium (and sometimes a third partner). We evaluate these hypotheses using the following three criteria. Can the data be explained by the null hypothesis that new features arise sequentially along a stem lineage? Second, hypotheses involving an archaeon and a bacterium should unde...
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ژورنال
عنوان ژورنال: Journal of Theoretical Biology
سال: 2017
ISSN: 0022-5193
DOI: 10.1016/j.jtbi.2017.04.031