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Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-46196

Schirrmeister, B; Antonelli, A; Bagheri, Homayoun C (2011). The origin of multicellularity in cyanobacteria. BMC Evolutionary Biology, 11(1):45.

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Abstract

Background: Cyanobacteria are one of the oldest and morphologically most diverse prokaryotic phyla on our planet. The early development of an oxygen-containing atmosphere approximately 2.45 - 2.22 billion years ago is attributed to the photosynthetic activity of cyanobacteria. Furthermore, they are one of the few prokaryotic phyla where multicellularity has evolved. Understanding when and how multicellularity evolved in these ancient organisms would provide fundamental information on the early history of life and further our knowledge of complex life forms.
Results: We conducted and compared phylogenetic analyses of 16S rDNA sequences from a large sample of taxa representing the morphological and genetic diversity of cyanobacteria. We reconstructed ancestral character states on 10,000 phylogenetic trees. The results suggest that the majority of extant cyanobacteria descend from multicellular ancestors. Reversals to unicellularity occurred at least 5 times. Multicellularity was established again at least once within a single-celled clade. Comparison to the fossil record supports an early origin of multicellularity, possibly as early as the “Great Oxygenation Event” that occurred 2.45 - 2.22 billion years ago.
Conclusions: The results indicate that a multicellular morphotype evolved early in the cyanobacterial lineage and was regained at least once after a previous loss. Most of the morphological diversity exhibited in cyanobacteria today —including the majority of single-celled species— arose from ancient multicellular lineages. Multicellularity could have conferred a considerable advantage for exploring new niches and hence facilitated the diversification of new lineages.

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32 citations in Web of Science®
46 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies
DDC:570 Life sciences; biology
590 Animals (Zoology)
Language:English
Date:2011
Deposited On:08 Mar 2011 18:55
Last Modified:27 Nov 2013 16:36
Publisher:BioMed Central
ISSN:1471-2148
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:10.1186/1471-2148-11-45
PubMed ID:21320320

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