Syndinean dinoflagellates of the genus <i>Euduboscquella</i> are paraphyletic

Yoo, Jiae; Coats, D. Wayne; Kim, Sunju

doi:10.1111/jeu.12953

Cited by 3 publications

(17 citation statements)

References 72 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…but was also observed to contain a large and distinctive circular “fried egg-like” inclusion measuring ~ 75 µm by 82 µm with a central nucleus and centripetal grooves on a cuticular disc (Fig. 2c ; Supplementary Movie 2 ); a common morphological characteristic of a mature trophonts in MALV-I parasites, including others infecting dinoflagellates 21 . Of the two cells from Curaçao: one was an infected Warnowia sp.…”

Section: Resultsmentioning

confidence: 99%

“…While the morphology of the former lacks sufficient resolution for definitive descriptions, it appears to contain a “brain-like” groove texture (Supplementary Movie 3 ) reminiscent of Euduboscquella sp. 4 ( OP445725 ) and ciliate-infecting Euduboscquella species 21 . The remaining cell from Curaçao, on the other hand, showed clear centripetal grooves and ridges, measured ~ 68 µm by 70 µm, and resembled a late-stage trophont or perhaps a newly emerged tomont (Fig.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Multiple parallel origins of parasitic Marine Alveolates

Holt,

Hehenberger,

Tikhonenkov

et al. 2023

Nat Commun

View full text Add to dashboard Cite

Microbial eukaryotes are important components of marine ecosystems, and the Marine Alveolates (MALVs) are consistently both abundant and diverse in global environmental sequencing surveys. MALVs are dinoflagellates that are thought to be parasites of other protists and animals, but the lack of data beyond ribosomal RNA gene sequences from all but a few described species means much of their biology and evolution remain unknown. Using single-cell transcriptomes from several MALVs and their free-living relatives, we show that MALVs evolved independently from two distinct, free-living ancestors and that their parasitism evolved in parallel. Phylogenomics shows one subgroup (MALV-II and -IV, or Syndiniales) is related to a novel lineage of free-living, eukaryovorous predators, the eleftherids, while the other (MALV-I, or Ichthyodinida) is related to the free-living predator Oxyrrhis and retains proteins targeted to a non-photosynthetic plastid. Reconstructing the evolution of photosynthesis, plastids, and parasitism in early-diverging dinoflagellates shows a number of parallels with the evolution of their apicomplexan sisters. In both groups, similar forms of parasitism evolved multiple times and photosynthesis was lost many times. By contrast, complete loss of the plastid organelle is infrequent and, when this does happen, leaves no residual genes.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Multiple parallel origins of parasitic Marine Alveolates

Holt,

Hehenberger,

Tikhonenkov

et al. 2023

Nat Commun

View full text Add to dashboard Cite

show abstract

“…This cell was identified from its morphology as the dinoflagellate Polykrikos but was also observed to contain a large and distinctive "fried egglike" inclusion with centripetal grooves on a cuticular episcopal disc (Fig. 2c); a common morphological characteristic of a mature trophonts in MALV I parasites, including others infecting dinoflagellates 21 .…”

Section: Malv I Is Closely Related To Oxyrrhis Another Free-living He...mentioning

confidence: 99%

“…Phylogenetic analysis of full-length SSU rRNA gene sequences extracted from the transcriptomic data showed the MALV I parasite clustering with full-support with a clade of unidentified environmental sequences in the MALV I clade (Fig 3). This fell within a larger group of parasites isolated from dinoflagellates, which were ascribed to Eudubosquella based on conserved morphological traits 21 . Eudubosquella has been isolated from both ciliates and dinoflagellates 21,22,23,24 , however the SSU rRNA gene tree (Fig.…”

Section: Malv I Is Closely Related To Oxyrrhis Another Free-living He...mentioning

confidence: 99%

“…This fell within a larger group of parasites isolated from dinoflagellates, which were ascribed to Eudubosquella based on conserved morphological traits 21 . Eudubosquella has been isolated from both ciliates and dinoflagellates 21,22,23,24 , however the SSU rRNA gene tree (Fig. 3; Extended Data Fig.…”

Section: Malv I Is Closely Related To Oxyrrhis Another Free-living He...mentioning

confidence: 99%

See 1 more Smart Citation

Multiple parallel origins of parasitic Marine Alveolates

Holt

Hehenberger

Tikhonenkov

et al. 2023

Preprint

View full text Add to dashboard Cite

Microbial eukaryotes are important components of marine ecosystems, and the Marine Alveolates (MALVs) are consistently one of the most abundant and diverse groups of eukaryotes in global environmental sequencing surveys. Relatives of the dinoflagellates, MALVs are thought to be parasites of animals and other protists but the absence of data beyond ribosomal RNA gene sequences from all but two species means much of their biology and evolution remain unknown. Here we show that MALVs evolved independently from two distinct, free-living ancestors and that parasitism evolved twice, in parallel, prior to the divergence of the core dinoflagellates. Phylogenomics shows one subgroup (MALV II and IV, or Syndiniales) to be related to a novel lineage of free-living, eukaryovorous predators, the eleftherids, while the other (MALV I, now the Ichthyodiniales) is related to Oxyrrhis marina. Reconstructing the evolution of photosynthesis, plastids, and parasitism in early-diverging dinoflagellates show a number of parallels with the evolution of their sister group, the parasitic apicomplexans. In both groups, similar forms of parasitism evolved multiple times, photosynthesis was lost many times, and the plastid organelle was lost infrequently, leaving no trace in the genome that they ever existed.

show abstract

Morphology of Hobagella saltata n. gen. and n. sp. (Syndiniophyceae, Miozoa) infecting the marine dinoflagellate Cucumeridinium coeruleum (Dinophyceae, Miozoa) and its potential onshore advection

Yoo,

Kim,

Coats

2024

Front. Mar. Sci.

Self Cite

View full text Add to dashboard Cite

Over the past decade, molecular phylogenies have placed endoparasites of the genus Euduboscquella in a distinct subclade within clade 4 of the Marine Alveolate (MALV) Group I. Recently, however, rRNA gene sequences have become available for four novel Euduboscquella-like species that infect dinoflagellates, with phylogenies including these sequences indicating that the genus Euduboscquella is paraphyletic. Here, we provide a morphological characterization of the intracellular and extracellular life-cycle stages of a novel species that infects Cucumeridinium coeruleum, a warm water pelagic species sometimes found in coastal environments. We formally describe the novel parasite, Hobagella saltata n. gen, n. sp., and identify a constellation of morphological and developmental characters that distinguish it, as well as Euduboscquella melo and E. nucleocola, both parasites of dinoflagellates, from Euduboscquella species that infect ciliates. We recommend the reassignment of E. melo and E. nucleocola as Hobagella melo n. comb. and H. nucleocola n. comb., respectively. We also propose the family Hobagellidae for these three congeners. We anticipate that the character set developed for distinguishing species of Euduboscquella and Hobagella will be valuable for sorting other Euduboscquella-Hobagella-like taxa scattered across the Group I phylogeny and will provide insight into morphological evolutionary patterns within Group I. Lastly, we consider the potential influence of summer-fall typhoons on the occurrence of H. saltata and its host C. coeruleum in near-shore waters along the southeastern coast of Korea and propose a hypothesis regarding the northward transport and onshore advection of host and parasite populations. If future research supports the hypothesized mechanisms, it could help us better understand parasite distribution and potential changes in biogeography associated with ongoing global changes in surface seawater temperature.

show abstract

Syndinean dinoflagellates of the genus Euduboscquella are paraphyletic

Cited by 3 publications

References 72 publications

Multiple parallel origins of parasitic Marine Alveolates

Multiple parallel origins of parasitic Marine Alveolates

Multiple parallel origins of parasitic Marine Alveolates

Morphology of Hobagella saltata n. gen. and n. sp. (Syndiniophyceae, Miozoa) infecting the marine dinoflagellate Cucumeridinium coeruleum (Dinophyceae, Miozoa) and its potential onshore advection

Contact Info

Product

Resources

About