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An analysis of the origin of metazoans, using comparisons of partial sequences of the 28S RNA, reveals an early emergence of triploblasts.

1991; Springer Nature; Volume: 10; Issue: 3 Linguagem: Inglês

10.1002/j.1460-2075.1991.tb07975.x

1460-2075

Richard Christen, Anne RATTO, Anne Baroin, Roland Perasso, K. G. Grell, A Adoutte,

Marine animal studies overview

Research Article1 March 1991free access An analysis of the origin of metazoans, using comparisons of partial sequences of the 28S RNA, reveals an early emergence of triploblasts. R. Christen R. Christen URA 671 CNRS, Station Zoologique, Villefranche sur mer, France. Search for more papers by this author A. Ratto A. Ratto URA 671 CNRS, Station Zoologique, Villefranche sur mer, France. Search for more papers by this author A. Baroin A. Baroin URA 671 CNRS, Station Zoologique, Villefranche sur mer, France. Search for more papers by this author R. Perasso R. Perasso URA 671 CNRS, Station Zoologique, Villefranche sur mer, France. Search for more papers by this author K. G. Grell K. G. Grell URA 671 CNRS, Station Zoologique, Villefranche sur mer, France. Search for more papers by this author A. Adoutte A. Adoutte URA 671 CNRS, Station Zoologique, Villefranche sur mer, France. Search for more papers by this author R. Christen R. Christen URA 671 CNRS, Station Zoologique, Villefranche sur mer, France. Search for more papers by this author A. Ratto A. Ratto URA 671 CNRS, Station Zoologique, Villefranche sur mer, France. Search for more papers by this author A. Baroin A. Baroin URA 671 CNRS, Station Zoologique, Villefranche sur mer, France. Search for more papers by this author R. Perasso R. Perasso URA 671 CNRS, Station Zoologique, Villefranche sur mer, France. Search for more papers by this author K. G. Grell K. G. Grell URA 671 CNRS, Station Zoologique, Villefranche sur mer, France. Search for more papers by this author A. Adoutte A. Adoutte URA 671 CNRS, Station Zoologique, Villefranche sur mer, France. Search for more papers by this author Author Information R. Christen1, A. Ratto1, A. Baroin1, R. Perasso1, K. G. Grell1 and A. Adoutte1 1URA 671 CNRS, Station Zoologique, Villefranche sur mer, France. The EMBO Journal (1991)10:499-503https://doi.org/10.1002/j.1460-2075.1991.tb07975.x PDFDownload PDF of article text and main figures. ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InMendeleyWechatReddit Figures & Info In order to study the origin of metazoans, we have compared sequences from the 5′ end of the large subunit ribosomal RNA of a number of protists, fungi, plants and metazoans, including all diploblastic phyla (sequences of 10 new species have been determined, including that of the placozoan, Trichoplax adhaerens). These sequences were analyzed using distance matrix, maximum parsimony and maximum likelihood methods, and the validity of the results was ascertained with bootstrapping and species removal or addition. Triploblasts and diploblasts formed two clearly separated monophyletic units; this divergence, which apparently preceded the diversification of diploblastic animals (i.e. the successive sponge, ctenophore, cnidarian radiations), showed a much more ancient origin of triploblasts with respect to diploblasts than classically assumed. These results do not exclude the possibility that triploblasts and diploblasts arose independently from different protists. Previous ArticleNext Article Volume 10Issue 31 March 1991In this issue RelatedDetailsLoading ...