Richard E. Triemer
Michigan State University
97Publications
25H-index
2,018Citations
Publications 97
Newest
Published on Dec 1, 2018in Scientific Reports 4.12
Anna Karnkowska5
Estimated H-index: 5
(University of Warsaw),
Matthew S. Bennett11
Estimated H-index: 11
(Michigan State University),
Richard E. Triemer25
Estimated H-index: 25
(Michigan State University)
Photosynthetic euglenids (Euglenophyta) are a monophyletic group of unicellular eukaryotes characterized by the presence of plastids, which arose as the result of the secondary endosymbiosis. Many Euglenophyta plastid (pt) genomes have been characterized recently, but they represented mainly one family – Euglenaceae. Here, we report a comparative analysis of plastid genomes from eight representatives of the family Phacaceae. Newly sequenced plastid genomes share a number of features including sy...
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Published on Jun 1, 2017in Journal of Phycology 3.00
Matthew S. Bennett11
Estimated H-index: 11
(Michigan State University),
Shin Han Shiu42
Estimated H-index: 42
(Michigan State University),
Richard E. Triemer25
Estimated H-index: 25
(Michigan State University)
4 Citations Source Cite
Published on Aug 25, 2017in PeerJ 2.12
Nadja Dabbagh2
Estimated H-index: 2
,
Matthew S. Bennett11
Estimated H-index: 11
(Michigan State University)
+ 1 AuthorsAngelika Preisfeld2
Estimated H-index: 2
BACKGROUND:Over the last few years multiple studies have been published showing a great diversity in size of chloroplast genomes (cpGenomes), and in the arrangement of gene clusters, in the Euglenales. However, while these genomes provided important insights into the evolution of cpGenomes across the Euglenales and within their genera, only two genomes were analyzed in regard to genomic variability between and within Euglenales and Eutreptiales. To better understand the dynamics of chloroplast g...
3 Citations Source Cite
Published on Mar 1, 2017in Harmful Algae 4.14
Paul V. Zimba26
Estimated H-index: 26
(Texas A&M University–Corpus Christi),
I-Shuo Huang3
Estimated H-index: 3
(Texas A&M University–Corpus Christi)
+ 3 AuthorsRichard E. Triemer25
Estimated H-index: 25
(Michigan State University)
Abstract Euglena sanguinea is known to produce the alkaloid toxin euglenophycin and is known to cause fish kills and inhibit mammalian tissue and microalgal culture growth. An analysis of over 30 species of euglenoids for accumulation of euglenophycin identified six additional species producing the toxin; and six of the seven E. sanguinea strains produced the toxin. A phylogenetic assessment of these species confirmed most taxa were in the Euglenaceae, whereas synthesis capability apparently has...
5 Citations Source Cite
Published on Feb 1, 2017in Journal of Phycology 3.00
Bryan Lakey1
Estimated H-index: 1
(Michigan State University),
Richard E. Triemer25
Estimated H-index: 25
(Michigan State University)
The history of euglenoids may have begun as early as ~2 bya. These early phagotrophs ate cyanobacteria, archaea, and eubacteria, and the subsequent appearance of red algae and chromalveolates provided euglenoids with additional food sources. Following the appearance of green algae, euglenoids acquired a chloroplast via a secondary endosymbiotic event with a green algal ancestor. This endosymbiosis also involved a massive transfer of nuclear-encoded genes from the symbiont nucleus to the host. Ex...
4 Citations Source Cite
Published on May 1, 2016in Journal of Eukaryotic Microbiology 2.54
Chelsea M. Markunas1
Estimated H-index: 1
(Michigan State University),
Richard E. Triemer25
Estimated H-index: 25
(Michigan State University)
Euglenids are an ancient lineage that may have existed as early as 2 billion years ago. A mere 65 years ago, Melvin Calvin and Andrew A. Benson performed experiments on Euglena gracilis and elucidated the series of reactions by which carbon was fixed and reduced during photosynthesis. However, the evolutionary history of this pathway (Calvin-Benson cycle) in euglenids was more complex than Calvin and Benson could have imagined. The chloroplast present today in euglenophytes arose from a secondar...
7 Citations Source Cite
Published on Nov 1, 2015in Journal of Eukaryotic Microbiology 2.54
Matthew S. Bennett11
Estimated H-index: 11
(Michigan State University),
Richard E. Triemer25
Estimated H-index: 25
(Michigan State University)
Over the last few years multiple studies have been published outlining chloroplast genomes that represent many of the photosynthetic euglenid genera. However, these genomes were scattered throughout the euglenophyceaean phylogenetic tree, and focused on comparisons with Euglena gracilis. Here, we present a study exclusively on taxa within the Euglenaceae. Six new chloroplast genomes were characterized, those of Cryptoglena skujai, E. gracilis var. bacillaris, Euglena viridis, Euglenaria anabaena...
22 Citations Source Cite
Published on May 1, 2015in Journal of Eukaryotic Microbiology 2.54
Anna Karnkowska5
Estimated H-index: 5
(University of Warsaw),
Matthew S. Bennett11
Estimated H-index: 11
(Michigan State University)
+ 3 AuthorsRichard E. Triemer25
Estimated H-index: 25
(Michigan State University)
Photosynthetic euglenids acquired chloroplasts by secondary endosymbiosis, which resulted in changes to their mode of nutrition and affected the evolution of their morphological characters. Mapping morphological characters onto a reliable molecular tree could elucidate major trends of those changes. We analyzed nucleotide sequence data from regions of three nuclear-encoded genes (nSSU, nLSU, hsp90), one chloroplast-encoded gene (cpSSU) and one nuclear-encoded chloroplast gene (psbO) to estimate ...
16 Citations Source Cite
Published on Jan 1, 2014in Phycologia 1.80
Matthew S. Bennett11
Estimated H-index: 11
(Michigan State University),
Krystle E. Wiegert5
Estimated H-index: 5
(Michigan State University),
Richard E. Triemer25
Estimated H-index: 25
Euglena proxima is a common, globally dispersed, and easily identified photosynthetic euglenoid. Previous phylogenetic analyses using nuclear-encoded small subunit (SSU) and large subunit (LSU) rRNA genes revealed that this taxon was paraphyletic with other Euglena species and was positioned as sister to all Euglenaceae. Despite this, authors were reluctant to remove this taxon from Euglena until additional data, or taxa pairing with E. proxima, were obtained because it created a monotypic genus...
20 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
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