The 4-Celled Tetrabaena socialis Nuclear Genome Reveals the Essential Components for Genetic Control of Cell Number at the Origin of Multicellularity in the Volvocine Lineage
Hanschen, Erik R
Ferris, Patrick J
Michod, Richard E
Olson, Bradley J S C
Durand, Pierre M
AffiliationUniv Arizona, Dept Ecol & Evolutionary Biol
MetadataShow full item record
PublisherOXFORD UNIV PRESS
CitationJonathan Featherston, Yoko Arakaki, Erik R Hanschen, Patrick J Ferris, Richard E Michod, Bradley J S C Olson, Hisayoshi Nozaki, Pierre M Durand; The 4-Celled Tetrabaena socialis Nuclear Genome Reveals the Essential Components for Genetic Control of Cell Number at the Origin of Multicellularity in the Volvocine Lineage, Molecular Biology and Evolution, Volume 35, Issue 4, 1 April 2018, Pages 855–870, https://doi.org/10.1093/molbev/msx332
JournalMOLECULAR BIOLOGY AND EVOLUTION
Rights© The Author(s) 2017. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution. All rights reserved.
Collection InformationThis 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 email@example.com.
AbstractMulticellularity is the premier example of a major evolutionary transition in individuality and was a foundational event in the evolution of macroscopic biodiversity. The volvocine chlorophyte lineage is well suited for studying this process. Extant members span unicellular, simple colonial, and obligate multicellular taxa with germ-soma differentiation. Here, we report the nuclear genome sequence of one of the most morphologically simple organisms in this lineage-the 4-celled colonial Tetrabaena socialis and compare this to the three other complete volvocine nuclear genomes. Using conservative estimates of gene family expansions a minimal set of expanded gene families was identified that associate with the origin of multicellularity. These families are rich in genes related to developmental processes. A subset of these families is lineage specific, which suggests that at a genomic level the evolution of multicellularity also includes lineagespecific molecular developments. Multiple points of evidence associate modifications to the ubiquitin proteasomal pathway (UPP) with the beginning of coloniality. Genes undergoing positive or accelerating selection in the multicellular volvocines were found to be enriched in components of the UPP and gene families gained at the origin of multicellularity include components of the UPP. A defining feature of colonial/multicellular life cycles is the genetic control of cell number. The genomic data presented here, which includes diversification of cell cycle genes and modifications to the UPP, align the genetic components with the evolution of this trait.
Note12 month embargo; published online: 26 December 2017
VersionFinal accepted manuscript
SponsorsNational Aeronautics and Space Administration [NNX13AH41G]; National Science Foundation [MCB-1412395]; University of Witwatersrand Department of Science and Technology National Research Foundation Centre of Excellence in Palaeosciences; University of Witwatersrand, Faculty of Health Science grant
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