Molecular phylogeny, scale evolution and taxonomy of centrohelid heliozoa

Heyden, Sophie von der

doi:10.1016/j.ympev.2007.04.019

Cited by 73 publications

(77 citation statements)

References 42 publications

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“…With about 90 described species and a vast diversity of environmental sequences [4], centrohelids have traditionally constituted the core of the original phylum Heliozoa, which included a subset of microbial eukaryotes characterized by a special type of pseudopodia, the axopodia. Heliozoa was shown to be a polyphyletic assemblage, and today several relatively minor lineages are scattered across the tree [5].…”

Section: Introductionmentioning

confidence: 99%

“…For example, centrohelids were weakly inferred to branch close to members of the Viridiplantae, specifically glaucophytes [6] or red algae [7]. Other studies showed the centrohelids to share affinities with haptophytes [4,8], or were inconclusive [9]. Even a larger-scale multigene analysis involving 127 genes was unsuccessful at the task, placing centrohelids with low confidence as sister to either haptophytes or the enigmatic telonemids [10].…”

Section: Introductionmentioning

confidence: 99%

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Untangling the early diversification of eukaryotes: a phylogenomic study of the evolutionary origins of Centrohelida, Haptophyta and Cryptista

et al. 2016

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Assembling the global eukaryotic tree of life has long been a major effort of Biology. In recent years, pushed by the new availability of genome-scale data for microbial eukaryotes, it has become possible to revisit many evolutionary enigmas. However, some of the most ancient nodes, which are essential for inferring a stable tree, have remained highly controversial. Among other reasons, the lack of adequate genomic datasets for key taxa has prevented the robust reconstruction of early diversification events. In this context, the centrohelid heliozoans are particularly relevant for reconstructing the tree of eukaryotes because they represent one of the last substantial groups that was missing large and diverse genomic data. Here, we filled this gap by sequencing high-quality transcriptomes for four centrohelid lineages, each corresponding to a different family. Combining these new data with a broad eukaryotic sampling, we produced a gene-rich taxon-rich phylogenomic dataset that enabled us to refine the structure of the tree. Specifically, we show that (i) centrohelids relate to haptophytes, confirming Haptista; (ii) Haptista relates to SAR; (iii) Cryptista share strong affinity with Archaeplastida; and (iv) Haptista þ SAR is sister to Cryptista þ Archaeplastida. The implications of this topology are discussed in the broader context of plastid evolution.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Untangling the early diversification of eukaryotes: a phylogenomic study of the evolutionary origins of Centrohelida, Haptophyta and Cryptista

et al. 2016

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“…Heterophrys spp., the dominant centrohelids detected in the spring (14 clones) and winter (1 clone) libraries, are a group of phagotrophic protists (16) and thus may affect the persistence of enteric bacteria in rivers. The spring is a particularly interesting time for studies regarding the fate of enteric bacteria due to the large amount of agricultural runoff (i.e., animal fecal matter), which has been associated with increases in levels of coliform bacteria (30) and spikes in enteric disease (53).…”

Section: Discussionmentioning

confidence: 99%

Seasonal Diversity of Planktonic Protists in Southwestern Alberta Rivers over a 1-Year Period as Revealed by Terminal Restriction Fragment Length Polymorphism and 18S rRNA Gene Library Analyses

Thomas

Selinger

Inglis

2012

Appl Environ Microbiol

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The temporal dynamics of planktonic protists in river water have received limited attention despite their ecological significance and recent studies linking phagotrophic protists to the persistence of human-pathogenic bacteria. Using molecular-based techniques targeting the 18S rRNA gene, we studied the seasonal diversity of planktonic protists in Southwestern Alberta rivers (Oldman River Basin) over a 1-year period. Nonmetric multidimensional scaling analysis of terminal restriction fragment length polymorphism (T-RFLP) data revealed distinct shifts in protistan community profiles that corresponded to season rather than geographical location. Community structures were examined by using clone library analysis; HaeIII restriction profiles of 18S rRNA gene amplicons were used to remove prevalent solanaceous plant clones prior to sequencing. Sanger sequencing of the V1-to-V3 region of the 18S rRNA gene libraries from spring, summer, fall, and winter supported the T-RFLP results and showed marked seasonal differences in the protistan community structure. The spring library was dominated by Chloroplastidae (29.8%), Centrohelida (28.1%), and Alveolata (25.5%), while the summer and fall libraries contained primarily fungal clones (83.0% and 88.0%, respectively). Alveolata (35.6%), Euglenozoa (24.4%), Chloroplastida (15.6%), and Fungi (15.6%) dominated the winter library. These data demonstrate that planktonic protists, including protozoa, are abundant in river water in Southwestern Alberta and that conspicuous seasonal shifts occur in the community structure.

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“…These groups include the telonemids, centrohelids, katablepharids, and Picomonas (32,(115)(116)(117)(118). As protist taxonomic sampling continues to expand, plastid-bearing lineages such as the cryptophytes have begun to look increasingly like isolated photosynthetic tips on a tree comprised mainly of heterotrophic branches.…”

Section: Gene Transfer and Genome Mosaicism: Causes And Consequencesmentioning

confidence: 99%

Genomic perspectives on the birth and spread of plastids

Archibald

2015

Proc. Natl. Acad. Sci. U.S.A.

114

113

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The endosymbiotic origin of plastids from cyanobacteria was a landmark event in the history of eukaryotic life. Subsequent to the evolution of primary plastids, photosynthesis spread from red and green algae to unrelated eukaryotes by secondary and tertiary endosymbiosis. Although the movement of cyanobacterial genes from endosymbiont to host is well studied, less is known about the migration of eukaryotic genes from one nucleus to the other in the context of serial endosymbiosis. Here I explore the magnitude and potential impact of nucleus-to-nucleus endosymbiotic gene transfer in the evolution of complex algae, and the extent to which such transfers compromise our ability to infer the deep structure of the eukaryotic tree of life. In addition to endosymbiotic gene transfer, horizontal gene transfer events occurring before, during, and after endosymbioses further confound our efforts to reconstruct the ancient mergers that forged multiple lines of photosynthetic microbial eukaryotes.

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Molecular phylogeny, scale evolution and taxonomy of centrohelid heliozoa

Cited by 73 publications

References 42 publications

Untangling the early diversification of eukaryotes: a phylogenomic study of the evolutionary origins of Centrohelida, Haptophyta and Cryptista

Untangling the early diversification of eukaryotes: a phylogenomic study of the evolutionary origins of Centrohelida, Haptophyta and Cryptista

Seasonal Diversity of Planktonic Protists in Southwestern Alberta Rivers over a 1-Year Period as Revealed by Terminal Restriction Fragment Length Polymorphism and 18S rRNA Gene Library Analyses

Genomic perspectives on the birth and spread of plastids

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