Evolution of cytokinesis-related protein localization during the emergence of multicellularity in volvocine green algae
Author
Arakaki, YokoFujiwara, Takayuki
Kawai-Toyooka, Hiroko
Kawafune, Kaoru
Featherston, Jonathan
Durand, Pierre M.
Miyagishima, Shin-ya
Nozaki, Hisayoshi

Affiliation
Univ Arizona, Dept Ecol & Evolut BiolIssue Date
2017-12-06
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BIOMED CENTRAL LTDCitation
Evolution of cytokinesis-related protein localization during the emergence of multicellularity in volvocine green algae 2017, 17 (1) BMC Evolutionary BiologyJournal
BMC Evolutionary BiologyRights
© The Author(s). 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
Background: The volvocine lineage, containing unicellular Chlamydomonas reinhardtii and differentiated multicellular Volvox carteri, is a powerful model for comparative studies aiming at understanding emergence of multicellularity. Tetrabaena socialis is the simplest multicellular volvocine alga and belongs to the family Tetrabaenaceae that is sister to more complex multicellular volvocine families, Goniaceae and Volvocaceae. Thus, T. socialis is a key species to elucidate the initial steps in the evolution of multicellularity. In the asexual life cycle of C. reinhardtii and multicellular volvocine species, reproductive cells form daughter cells/colonies by multiple fission. In embryogenesis of the multicellular species, daughter protoplasts are connected to one another by cytoplasmic bridges formed by incomplete cytokinesis during multiple fission. These bridges are important for arranging the daughter protoplasts in appropriate positions such that species-specific integrated multicellular individuals are shaped. Detailed comparative studies of cytokinesis between unicellular and simple multicellular volvocine species will help to elucidate the emergence of multicellularity from the unicellular ancestor. However, the cytokinesis-related genes between closely related unicellular and multicellular species have not been subjected to a comparative analysis. Results: Here we focused on dynamin-related protein 1 (DRP1), which is known for its role in cytokinesis in land plants. Immunofluorescence microscopy using an antibody against T. socialis DRP1 revealed that volvocine DRP1 was localized to division planes during cytokinesis in unicellular C. reinhardtii and two simple multicellular volvocine species T. socialis and Gonium pectorale. DRP1 signals were mainly observed in the newly formed division planes of unicellular C. reinhardtii during multiple fission, whereas in multicellular T. socialis and G. pectorale, DRP1 signals were observed in all division planes during embryogenesis. Conclusions: These results indicate that the molecular mechanisms of cytokinesis may be different in unicellular and multicellular volvocine algae. The localization of DRP1 during multiple fission might have been modified in the common ancestor of multicellular volvocine algae. This modification may have been essential for the re-orientation of cells and shaping colonies during the emergence of multicellularity in this lineage.ISSN
1471-2148PubMed ID
29212441Version
Final published versionSponsors
NIG-JOINT; MEXT/JSPS KAKENHI [25-9234, 16H02518]; National Research Foundation, South Africa [RA151217156515]ae974a485f413a2113503eed53cd6c53
10.1186/s12862-017-1091-z
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Except where otherwise noted, this item's license is described as © The Author(s). 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License.
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