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Richard E. Triemer
Michigan State University
96Publications
26H-index
2,141Citations
Publications 94
Newest
#1Anna Karnkowska (University of Warsaw)H-Index: 8
#2Matthew S. Bennett (MSU: Michigan State University)H-Index: 10
Last.Richard E. Triemer (MSU: Michigan State University)H-Index: 26
view all 3 authors...
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...
2 CitationsSource
#1Nadja DabbaghH-Index: 2
#2Matthew S. Bennett (MSU: Michigan State University)H-Index: 10
Last.Angelika PreisfeldH-Index: 2
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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 CitationsSource
#1Matthew S. Bennett (MSU: Michigan State University)H-Index: 10
#2Shin-Han Shiu (MSU: Michigan State University)H-Index: 44
Last.Richard E. Triemer (MSU: Michigan State University)H-Index: 26
view all 3 authors...
5 CitationsSource
#1Paul V. Zimba (A&M-CC: Texas A&M University–Corpus Christi)H-Index: 28
#2I-Shuo Huang (A&M-CC: Texas A&M University–Corpus Christi)H-Index: 3
Last.Richard E. Triemer (MSU: Michigan State University)H-Index: 26
view all 6 authors...
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 been los...
5 CitationsSource
#1Bryan Lakey (MSU: Michigan State University)H-Index: 1
#2Richard E. Triemer (MSU: Michigan State University)H-Index: 26
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...
7 CitationsSource
#1Chelsea M. Markunas (MSU: Michigan State University)H-Index: 1
#2Richard E. Triemer (MSU: Michigan State University)H-Index: 26
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...
9 CitationsSource
#1Matthew S. Bennett (MSU: Michigan State University)H-Index: 10
#2Richard E. Triemer (MSU: Michigan State University)H-Index: 26
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...
23 CitationsSource
#1Anna Karnkowska (University of Warsaw)H-Index: 8
#2Matthew S. Bennett (MSU: Michigan State University)H-Index: 10
Last.Richard E. Triemer (MSU: Michigan State University)H-Index: 26
view all 6 authors...
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 ...
18 CitationsSource
#1Richard E. Triemer (MSU: Michigan State University)H-Index: 26
#2Bożena Zakryś (University of Warsaw)H-Index: 12
Euglenoids form a diverse group of eukaryotic organisms that may have arisen a billion years or more before the origins of plants and animals. They are largely unicellular flagellates with only one genus, and they form colonies. There are nearly 2,900 nominal species for the major photosynthetic taxa, but, of these, only about 800 are accepted as taxonomically valid. Modern phylogenetics has caused numerous changes in euglenoid taxonomy, which keeps the number of accepted species in constant tra...
2 CitationsSource
#1Matthew S. Bennett (MSU: Michigan State University)H-Index: 10
#2Richard E. Triemer (MSU: Michigan State University)H-Index: 26
Since its creation in 1917 the genus Cyclidiopsis, and its validity, has been a source of debate among euglenid taxonomists. While many authors have supported its legitimacy, various other authors have considered it to be a subgenus of Astasia or even promoted its complete dissolution. In this study, we have sequenced the small subunit and large subunit ribosomal DNA of Cyclidiopsis acus, the type species for the genus. Subsequent phylogenetic analyses showed that C. acus grouped with taxa from ...
4 CitationsSource
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