title: [Eukaryogenesis: a model derivated from ribosomal RNA molecular phylogenise].
abstract: We have undertaken the construction of a broad molecular phylogeny of protists through the comparison of 28S rRNA molecules. The sequences from several major protistan phyla were aligned and combined with a broad database of metazoans, metaphytes, fungi and bacteria and we have derived dendrograms from both distance matrix and parsimony methods. In agreement with classical systematics, a number of monophyletic groups separated by large evolutionary distances were observed (those of the ciliates, the chlorophytes, etc.). From this analysis, several inferences on the eukaryogenesis can be made among which the ancient origin of the cytoskeleton, the late occurrence of the chloroplastic endosymbiosis and the simultaneous emergence of the triploblastic and diploblastic metazoan patterns.
authors.affiliation: Laboratoire de Biologie Cellulaire 4, CNRS UA 1134, Orsay.
authors.forename: R
authors.initials: R
authors.lastname: Perasso
authors.forename: A
authors.initials: A
authors.lastname: Baroin-Tourancheau
mesh_terms: D001483:Base Sequence; D005057:Eukaryotic Cells; D008969:Molecular Sequence Data; D010802:Phylogeny; D012339:RNA, Ribosomal, 28S / Q000235:genetics*
chemical_list: D012339:RNA, Ribosomal, 28S
vernacular_title: L'Eucaryogenèse: un modèle dérivé des phylogénies moléculaires basées sur les ARN ribosomiques.