Naoji Yubuki
University of British Columbia
33Publications
15H-index
617Citations
Publications 33
Newest
Published on Jul 18, 2018in Frontiers in Ecology and Evolution
Naoji Yubuki15
Estimated H-index: 15
(University of British Columbia),
Brian S. Leander34
Estimated H-index: 34
(University of British Columbia)
Several lineages of euglenozoans are enveloped with epibiotic bacteria and live in low oxygen and anoxic marine sediments, such as Bihospites bacati and Calkinsia aureus. A combination of shared ultrastructural traits and molecular phylogenetic inferences demonstrate that these lineages belong to a clade called the “Symbiontida”. Bihospites and Calkinsia possess all of the synapomorphies for the Euglenozoa plus several novel traits. Bihospites has a distinctive cell surface organization reminisc...
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Published on Apr 3, 2017in European Journal of Phycology 2.48
Mona Hoppenrath23
Estimated H-index: 23
,
Naoji Yubuki15
Estimated H-index: 15
+ 1 AuthorsBrian S. Leander34
Estimated H-index: 34
ABSTRACTTwo monospecific genera of marine benthic dinoflagellates, Adenoides and Pseudadenoides, have unusual thecal tabulation patterns (lack of cingular plates in the former; and no precingular plates and a complete posterior intercalary plate series in the latter) and are thus difficult to place within a phylogenetic framework. Although both genera share morphological similarities, they have not formed sister taxa in previous molecular phylogenetic analyses. We discovered and characterized a ...
4 Citations Source Cite
Published on Dec 1, 2016in Protist 2.70
Naoji Yubuki15
Estimated H-index: 15
(University of British Columbia),
Sam S.C. Huang1
Estimated H-index: 1
(University of British Columbia),
Brian S. Leander34
Estimated H-index: 34
(University of British Columbia)
The Fornicata (Excavata) is a group of microbial eukaryotes consisting of both free-living lineages (e.g., Carpediemonas ) and parasitic lineages (e.g. Giardia and Retortamonas ) that share several molecular and ultrastructural traits. Carpediemonas -like organisms (CLOs) are free-living lineages that diverged early within the Fornicata, making them important for inferring the early evolutionary history of the group. Molecular phylogenetic analyses of free-living fornicates, including sequences ...
1 Citations Source Cite
Published on Sep 1, 2016in Molecular and Biochemical Parasitology 1.74
Naoji Yubuki15
Estimated H-index: 15
(Charles University in Prague),
Ivan Čepička19
Estimated H-index: 19
(Charles University in Prague),
Brian S. Leander34
Estimated H-index: 34
(University of British Columbia)
The microtubular cytoskeleton of most single-celled eukaryotes radiates from an organizing center called the flagellar apparatus, which is essential for locomotion, feeding and reproduction. The structure of the flagellar apparatus tends to be conserved within diverse clades of eukaryotes, and modifications of this overall structure distinguish different clades from each other. Understanding the unity and diversity of the flagellar apparatus provides important insights into the evolutionary hist...
5 Citations Source Cite
Published on Jan 1, 2015in Phycological Research 1.27
Ryoma Kamikawa14
Estimated H-index: 14
(Kyoto University),
Naoji Yubuki15
Estimated H-index: 15
(University of British Columbia)
+ 8 AuthorsShigeki Mayama14
Estimated H-index: 14
(Tokyo Gakugei University)
Summary In order to obtain insights into the evolution of colorless (apochlorotic) diatoms, we investigated newly established apochlorotic strains of Nitzschia spp. using light and electron microscopy and molecular phylogenetic analyses. Fluorescence microscopic observations demonstrated that the apochlorotic diatoms lack chlorophylls. Transmission electron microscopy of two apochlorotic strains also demonstrated that their plastids lacked thylakoids; instead, having four-membrane-bound organell...
10 Citations Source Cite
Published on Jul 1, 2015in Journal of Eukaryotic Microbiology 2.54
Naoji Yubuki15
Estimated H-index: 15
(University of British Columbia),
Tomáš Pánek19
Estimated H-index: 19
(Charles University in Prague)
+ 4 AuthorsBrian S. Leander34
Estimated H-index: 34
(University of British Columbia)
Although environmental DNA surveys improve our understanding of biodiversity, interpretation of unidentified lineages is limited by the absence of associated morphological traits and living cultures. Unidentified lineages of marine stramenopiles are called “MAST clades”. Twenty-five MAST clades have been recognized: MAST-1 through MAST-25; seven of these have been subsequently discarded because the sequences representing those clades were found to either (1) be chimeric or (2) affiliate within p...
10 Citations Source Cite
Published on Mar 1, 2014in Journal of Eukaryotic Microbiology 2.54
Thierry J. Heger16
Estimated H-index: 16
(University of British Columbia),
Virginia P. Edgcomb30
Estimated H-index: 30
(Woods Hole Oceanographic Institution)
+ 3 AuthorsNaoji Yubuki15
Estimated H-index: 15
(University of British Columbia)
e ABSTRACT The discovery and characterization of protist communities from diverse envi- ronments are crucial for understanding the overall evolutionary history of life on earth. However, major questions about the diversity, ecology, and evolu- tionary history of protists remain unanswered, notably because data obtained from natural protist communities, especially of heterotrophic species, remain limited. In this review, we discuss the challenges associated with "field protis- tology", defined he...
17 Citations Source Cite
Published on Jan 1, 2014in BMC Evolutionary Biology 3.03
Jana Szabová4
Estimated H-index: 4
(Charles University in Prague),
Naoji Yubuki15
Estimated H-index: 15
(Canadian Institute for Advanced Research)
+ 2 AuthorsVladimír Hampl21
Estimated H-index: 21
(Charles University in Prague)
Background Methionine adenosyltransferase (MAT) is a ubiquitous essential enzyme that, in eukaryotes, occurs in two relatively divergent paralogues: MAT and MATX. MATX has a punctate distribution across the tree of eukaryotes and, except for a few cases, is mutually exclusive with MAT. This phylogenetic pattern could have arisen by either differential loss of old paralogues or the spread of one of these paralogues by horizontal gene transfer. Our aim was to map the distribution of MAT/MATX genes...
2 Citations Source Cite
Published on Jan 1, 2013in European Journal of Protistology 2.43
Naoji Yubuki15
Estimated H-index: 15
(University of British Columbia),
Alastair G. B. Simpson37
Estimated H-index: 37
(Dalhousie University),
Brian S. Leander34
Estimated H-index: 34
(University of British Columbia)
Microbial eukaryotes living in low oxygen environments often have novel physiological and morphological features that facilitate symbiotic relationships with bacteria and other means for acquiring nutrients. Comparative studies of these features provide evidence for phylogenetic relationships and evolutionary history. Postgaardi mariagerensis, for instance, is a euglenozoan that lives in low oxygen environments and is enveloped by episymbiotic bacteria. The general ultrastructure of P. mariagere...
15 Citations Source Cite
Published on Mar 1, 2013in Journal of Eukaryotic Microbiology 2.54
Susana A. Breglia5
Estimated H-index: 5
(Canadian Institute for Advanced Research),
Naoji Yubuki15
Estimated H-index: 15
(Canadian Institute for Advanced Research),
Brian S. Leander34
Estimated H-index: 34
(Canadian Institute for Advanced Research)
Euglenids comprise a distinct clade of flagellates with diverse modes of nutrition, including phagotrophy, osmotrophy and phototrophy. Much of the previous research on euglenids has focused on phototrophic species because of their ecological abundance and significance as indicators for the health of aquatic ecosystems. Although largely understudied, phagotrophic species probably represent the majority of euglenid diversity. Phagotrophic euglenids tend to be either bacterivorous or eukaryovorous ...
11 Citations Source Cite
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