Evolutionary relationships among marine cercozoans as inferred from combined SSU and LSU rDNA sequences and polyubiquitin insertions

Molecular Phylogenetics and Evolution
Chitchai ChantangsiBrian S Leander

Abstract

An insertion of one or two amino acids at the monomer-monomer junctions of polyubiquitin is a distinct and highly conserved molecular character that is shared by two very diverse clades of microeukaryotes, the Cercozoa and the Foraminifera. It has been suggested that an insertion consisting of one amino acid, like that found in foraminiferans and some cercozoans, represents an ancestral state, and an insertion consisting of two amino acids represents a derived state. However, the limited number of cercozoan taxa examined so far limits inferences about the number and frequency of state changes associated with this character over deep evolutionary time. Cercozoa include a very diverse assemblage of mainly uncultivated amoeboflagellates, and their tenuous phylogenetic interrelationships have been based largely on small subunit (SSU) rDNA sequences. Because concatenated datasets consisting of both SSU and large subunit (LSU) rDNA sequences have been shown to more robustly recover the phylogenetic relationships of other major groups of eukaryotes, we employed a similar approach for the Cercozoa. In order to reconstruct the evolutionary history of this group, we amplified twelve LSU rDNAs, three SSU rDNAs, and seven polyubiquitin seq...Continue Reading

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Citations

Aug 20, 2011·PloS One·Anders K KrabberødKamran Shalchian-Tabrizi
Jun 30, 2012·The Journal of Eukaryotic Microbiology·Takashi ShiratoriKen-Ichiro Ishida
Jun 19, 2012·The Journal of Eukaryotic Microbiology·Mary Thaler, Connie Lovejoy
Jan 10, 2014·Biology Letters·J Colette BerbesquePeter Thompson

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