On the phylogenetic position of the genus Raphidocystis (Haptista: Centroplasthelida) with notes on the dimorphism in centrohelid life cycle

Zlatogursky, Vasily V.; Drachko, Daria; Klimov, Vladimir I.; Shɨshkin, Yegor

doi:10.1016/j.ejop.2018.03.006

Cited by 23 publications

(23 citation statements)

References 19 publications

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“…The smaller sex inventory of Centrohelida is preliminary, as it is basically derived from transcriptomes and the sequencing of one or more genomes for this group could provide more information on the subject. Anyway, a handful of meiotic proteins in some representatives of Centrohelida combined with dimorphism of life‐cycle stages in some species suggest the possibility of sexual life cycles for this group as well. Meiosis has never been observed for any of these three large groups of eukaryotes and all kinds of evidence supporting it are indirect.…”

Section: Sexuals and “Asexuals” Share The Same Meiotic Machinerymentioning

confidence: 99%

All Eukaryotes Are Sexual, unless Proven Otherwise

Hofstatter

Lahr

2019

BioEssays

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Here a wide distribution of meiotic machinery is shown, indicating the occurrence of sexual processes in all major eukaryotic groups, without exceptions, including the putative “asexuals.” Meiotic machinery has evolved from archaeal DNA repair machinery by means of ancestral gene duplications. Sex is very conserved and widespread in eukaryotes, even though its evolutionary importance is still a matter of debate. The main processes in sex are plasmogamy, followed by karyogamy and meiosis. Meiosis is fundamentally a chromosomal process, which implies recombination and ploidy reduction. Several eukaryotic lineages are proposed to be asexual because their sexual processes are never observed, but presumed asexuality correlates with lack of study. The authors stress the complete lack of meiotic proteins in nucleomorphs and their almost complete loss in the fungus Malassezia. Inversely, complete sets of meiotic proteins are present in fungal groups Glomeromycotina, Trichophyton, and Cryptococcus. Endosymbiont Perkinsela and endoparasitic Microsporidia also present meiotic proteins.

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Section: Sexuals and “Asexuals” Share The Same Meiotic Machinerymentioning

confidence: 99%

All Eukaryotes Are Sexual, unless Proven Otherwise

Hofstatter

Lahr

2019

BioEssays

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“…At the same time some recent data suggest that at least some species of centrohelids have different sets of scale types with a contrasting morphology after excystment (Zlatogursky ) or as a part of complex life cycle with alteration of morphologies (Zlatogursky et al. ) , which emphasizes the necessity of molecular data to be obtained for all the species. Recently we have shown that SSU rDNA (the main marker gene used in centrohelids) is undergoing a process of gradual elongation in the course of centrohelids evolution.…”

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confidence: 99%

Pinjata ruminata gen. et sp. n.—A New Member of Centrohelid Family Yogsothothidae (Haptista: Centroplasthelida) from the Brackish River

Zlatogursky

Герасимова

Drachko

et al. 2019

J Eukaryotic Microbiology

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A new genus and species of centrohelid heliozoan Pinjata ruminata from the Tuzlukkol’ River (Orenburg Region of Russia) and Gorʼkoe Lake (Chelyabinsk Region of Russia) is studied with light‐ and electron microscopy. Pinjata ruminata has two types of plate scales, partially running up the sides of the axopodia. Inner plate scales (3.2–4.9 × 1.5–2.6 μm) are flat, ovate‐oblong and have a broad axial thickening and a thin electron‐dense border. Outer plate scales (4.2–6.7 × 1.5–3.0 μm) are concave, elongated, of irregular shape, often curved, and broadened towards one end. Roundish depressions are forming two rows on both sides of the narrow axial thickening. The cells are attached to the substratum. Molecular phylogenetic analysis based on the SSU rDNA robustly placed P. ruminata in the family Yogsothothidae. This position is confirmed with the presence of five panacanthocystid increase regions. The morphology of the new genus is in a good accordance with diagnosis of the family. The status of a genus “Heteroraphidiophrys” is discussed. Other potential findings of Pinjata from literature are analyzed. Pinjata represents the third lineage of centrohelids, characterized with the presence of only tangentially oriented plate scales. The halophilic nature of Yogsothothidae is suggested.

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“…Raphidocystis contractilis (initially described as a member of a genus Raphidiophrys , see Zlatogursky et al. for nomenclature details) originally was found in brackish pond in Shukkeien Garden, Hiroshima City, Japan (Kinoshita et al. ).…”

Section: Discussionmentioning

confidence: 99%

“…; Zlatogursky ; Zlatogursky et al. ). Sequencing of 18S rDNA amplicons from the total DNA of environmental samples has revealed a considerable diversity of centrohelids, and it was suggested that over 90% of centrohelid species probably remain undescribed (Cavalier‐Smith and von der Heyden ).…”

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confidence: 99%

“…Centrohelids along with haptophytes form the clade Haptista (Burki et al 2016;Cavalier-Smith et al 2015). The main marker gene for molecular phylogenetic studies of centrohelids is 18S rDNA, which broadly used to test evolutionary assumptions and hypotheses, as well as to improve the taxonomy (Cavalier-Smith and Chao 2012;Cavalier-Smith and von der Heyden 2007;Shɨshkin et al 2018;Zlatogursky 2016;Zlatogursky et al 2018). Sequencing of 18S rDNA amplicons from the total DNA of environmental samples has revealed a considerable diversity of centrohelids, and it was suggested that over 90% of centrohelid species probably remain undescribed (Cavalier-Smith and von der Heyden 2007).…”

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confidence: 99%

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Multiple Euryhaline Lineages of Centrohelids (Haptista: Centroplasthelida) in Inland Saline Waters Revealed with Metabarcoding

Герасимова

Плотников

Khlopko

et al. 2019

J Eukaryotic Microbiology

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The diversity of centrohelids in inland saline waters was studied with metabarcoding for the first time. The fragment of V6–V7 regions of 18S rDNA was sequenced with newly designed primers. Obtained OTUs were identified with molecular phylogenetic analysis and comparison of the signatures in 39es9 hairpin of V7. The obtained data included some OTUs, which could be attributed to four described species, but the majority belonged to previously established or novel environmental clades. Along with some presumably marine/brackish clades and freshwater/low salinity (0–2 ppt) clades, seven presumable species demonstrating broad (from 1–2 up to 78 ppt) salinity tolerance were detected. A number of OTUs belonged to Raphidocystis contractilis, which is known from three independent findings in brackish habitats only. Thus, it was assumed that this species is stenohaline and specifically adapted to salinity 5–15 ppt. The high level of salinity tolerance was suggested for centrohelids before based on morphology, which was used to justify their cosmopolitan distribution. Later these views were criticized based on environmental sequencing, but the results of the current survey indicate, that at least some species are present at salinities from almost freshwater (1–2 ppt) to twice oceanic (78 ppt) and are presumably capable of overcoming oceanic salinity barriers for their distribution.

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On the phylogenetic position of the genus Raphidocystis (Haptista: Centroplasthelida) with notes on the dimorphism in centrohelid life cycle

Cited by 23 publications

References 19 publications

All Eukaryotes Are Sexual, unless Proven Otherwise

All Eukaryotes Are Sexual, unless Proven Otherwise

Pinjata ruminata gen. et sp. n.—A New Member of Centrohelid Family Yogsothothidae (Haptista: Centroplasthelida) from the Brackish River

Multiple Euryhaline Lineages of Centrohelids (Haptista: Centroplasthelida) in Inland Saline Waters Revealed with Metabarcoding

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