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Single cell transcriptomics of ABEDINIUM reveals a new early-branching dinoflagellate lineage.

Identifieur interne : 000044 ( Main/Exploration ); précédent : 000043; suivant : 000045

Single cell transcriptomics of ABEDINIUM reveals a new early-branching dinoflagellate lineage.

Auteurs : Elizabeth C. Cooney [Canada] ; Noriko Okamoto [Canada] ; Anna Cho [Canada] ; Elisabeth Hehenberger [Canada, Allemagne] ; Thomas A. Richards [Royaume-Uni] ; Alyson E. Santoro [États-Unis] ; Alexandra Z. Worden [Allemagne] ; Brian S. Leander [Canada] ; Patrick J. Keeling [Canada]

Source :

RBID : pubmed:33045041

Abstract

Dinoflagellates possess many cellular characteristics with unresolved evolutionary histories. These include nuclei with greatly expanded genomes and chromatin packaged using histone-like proteins and dinoflagellate-viral nucleoproteins instead of histones, highly reduced mitochondrial genomes with extensive RNA editing, a mix of photosynthetic and cryptic secondary plastids, and tertiary plastids. Resolving the evolutionary origin of these traits requires understanding their ancestral states and early intermediates. Several early-branching dinoflagellate lineages are good candidates for such reconstruction, however these cells tend to be delicate and environmentally sparse, complicating such analyses. Here, we employ transcriptome sequencing from manually isolated and microscopically documented cells to resolve the placement of two cells of one such genus, Abedinium, collected by Remotely Operated Vehicle (ROV) in deep waters off the coast of Monterey Bay, California, USA. One cell corresponds to the only described species, A. dasypus, while the second cell is distinct and formally described as Abedinium folium, sp. nov. Abedinium has classically been assigned to the early-branching dinoflagellate subgroup Noctilucales, which is weakly supported by phylogenetic analyses of small subunit ribosomal RNA (SSU rRNA), the single characterized gene from any member of the order. However, an analysis based on 221 proteins from the transcriptome places Abedinium as a distinct lineage, separate from and basal to Noctilucales and the rest of the core dinoflagellates. The transcriptome also contains evidence of a cryptic plastid functioning in the biosynthesis of isoprenoids, iron-sulfur clusters, and heme, a mitochondrial genome with all three expected protein-coding genes (cob, cox1, and cox3), and the presence of some but not all dinoflagellate-specific chromatin packaging proteins.

DOI: 10.1093/gbe/evaa196
PubMed: 33045041


Affiliations:


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Le document en format XML

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<AffiliationInfo>
<Affiliation>Kiel University, Christian-Albrechts-Platz 4, Kiel, Germany.</Affiliation>
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<Affiliation>Department of Botany, University of British Columbia, Vancouver V6T 1Z4, British Columbia, Canada.</Affiliation>
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<AffiliationInfo>
<Affiliation>Department of Zoology, University of British Columbia, Vancouver V6T 1Z4, British Columbia, Canada.</Affiliation>
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<name sortKey="Worden, Alexandra Z" sort="Worden, Alexandra Z" uniqKey="Worden A" first="Alexandra Z" last="Worden">Alexandra Z. Worden</name>
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<name sortKey="Richards, Thomas A" sort="Richards, Thomas A" uniqKey="Richards T" first="Thomas A" last="Richards">Thomas A. Richards</name>
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<name sortKey="Santoro, Alyson E" sort="Santoro, Alyson E" uniqKey="Santoro A" first="Alyson E" last="Santoro">Alyson E. Santoro</name>
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