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dc.contributor.authorJanouškovec, Jan
dc.contributor.authorGavelis, Gregory S.
dc.contributor.authorBurki, Fabien
dc.contributor.authorDinh, Donna
dc.contributor.authorBachvaroff, Tsvetan R.
dc.contributor.authorGornik, Sebastian G.
dc.contributor.authorBright, Kelley J.
dc.contributor.authorImanian, Behzad
dc.contributor.authorStrom, Suzanne L.
dc.contributor.authorDelwiche, Charles F.
dc.contributor.authorWaller, Ross F.
dc.contributor.authorFensome, Robert A.
dc.contributor.authorLeander, Brian S.
dc.contributor.authorRohwer, Forest L.
dc.contributor.authorSaldarriaga, Juan F.
dc.date.accessioned2018-09-20T16:11:54Z
dc.date.available2018-09-20T16:11:54Z
dc.date.issued2016-12-27
dc.identifier.citationJanouškovec, Jan; Gavelis, Gregory S. Burki, Fabien; Dinh, Donna; Bachvaroff, Tsvetan R.; Gornik, Sebastian G.; Bright, Kelley J.; Imanian, Behzad; Strom, Suzanne L.; Delwiche, Charles F.; Waller, Ross F.; Fensome, Robert A.; Leander, Brian S.; Rohwer, Forest L.; Saldarriaga, Juan F. (2016). Major transitions in dinoflagellate evolution unveiled by phylotranscriptomics. Proceedings of the National Academy of Sciences 114 (2), E171-E180
dc.identifier.issn0027-8424,1091-6490
dc.identifier.urihttp://hdl.handle.net/10379/12070
dc.description.abstractDinoflagellates are key species in marine environments, but they remain poorly understood in part because of their large, complex genomes, unique molecular biology, and unresolved in-group relationships. We created a taxonomically representative dataset of dinoflagellate transcriptomes and used this to infer a strongly supported phylogeny to map major morphological and molecular transitions in dinoflagellate evolution. Our results show an early-branching position of Noctiluca, monophyly of thecate (plate-bearing) dinoflagellates, and paraphyly of athecate ones. This represents unambiguous phylogenetic evidence for a single origin of the group's cellulosic theca, which we show coincided with a radiation of cellulases implicated in cell division. By integrating dinoflagellate molecular, fossil, and biogeochemical evidence, we propose a revised model for the evolution of thecal tabulations and suggest that the late acquisition of dinosterol in the group is inconsistent with dinoflagellates being the source of this biomarker in pre-Mesozoic strata. Three distantly related, fundamentally nonphotosynthetic dinoflagellates, Noctiluca, Oxyrrhis, and Dinophysis, contain cryptic plastidial metabolisms and lack alternative cytosolic pathways, suggesting that all free-living dinoflagellates are metabolically dependent on plastids. This finding led us to propose general mechanisms of dependency on plastid organelles in eukaryotes that have lost photosynthesis; it also suggests that the evolutionary origin of bioluminescence in nonphotosynthetic dinoflagellates may be linked to plastidic tetrapyrrole biosynthesis. Finally, we use our phylogenetic framework to show that dinoflagellate nuclei have recruited DNA-binding proteins in three distinct evolutionary waves, which included two independent acquisitions of bacterial histone-like proteins.
dc.publisherProceedings of the National Academy of Sciences
dc.relation.ispartofProceedings of the National Academy of Sciences
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Ireland
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/3.0/ie/
dc.subjectdinoflagellates
dc.subjectphylogeny
dc.subjecttheca
dc.subjectplastids
dc.subjectdinosterol
dc.subjectcrypthecodinium-cohnii
dc.subjectphylogenetic analyses
dc.subjectsymbiodinium-minutum
dc.subjectamphidinium-carterae
dc.subjectmolecular fossils
dc.subjectoxyrrhis-marina
dc.subjectplastid genome
dc.subjectgene-transfer
dc.subjectsp-nov
dc.subjectdinophyceae
dc.titleMajor transitions in dinoflagellate evolution unveiled by phylotranscriptomics
dc.typeArticle
dc.identifier.doi10.1073/pnas.1614842114
dc.local.publishedsourcehttp://www.pnas.org/content/114/2/E171.full.pdf
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