Comparative analysis of the mitochondrial genomes of Orthonectida: insights into the evolution of an invertebrate parasite species

Bondarenko, Natalya; Bondarenko, Anton S.; Starunov, Viktor V.; Slyusarev, George S.

doi:10.1007/s00438-019-01543-1

Cited by 20 publications

(15 citation statements)

References 26 publications

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“…(Armstrong et al, 2000; Gibson et al, 2007) and sucking lice (Shao et al, 2009). Notably, the mitochondrial DNAs from orthonectids Intoshia linei , Intoshia variabili , and Rhopalura ophiocomae retain typical structure for metazoans and encode the full set of mitochondrial genes on a single circular molecule (Robertson et al, 2018; Bondarenko et al, 2019). The reason why the mitochondrial Dicyema spp.…”

Section: Resultsmentioning

confidence: 99%

Dicyemida and Orthonectida: Two Stories of Body Plan Simplification

et al. 2019

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Section: Resultsmentioning

confidence: 99%

Dicyemida and Orthonectida: Two Stories of Body Plan Simplification

et al. 2019

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“…Among Spiralia (to which rotifers belong(40-42)) it has been reported in e.g. Cycliophora(43-47), Orthonectida(48), which are now considered parasitic annelids(49, 50), some octopi(51) and in several annelid clades including some dinophilids(52-54), Osedax (55-57), Spionidae(58, 59) and bonellid echiurans(60). There are two proposed mechanisms responsible for the origin of dwarfism: progenesis or reduction(61, 62), which are reflected in the morphology of the dwarfed forms, including their nervous system and musculature(52).…”

Section: Discussionmentioning

confidence: 99%

Morphology of the nervous system of monogonont rotiferEpiphanes sentawith focus on sexual dimorphism between feeding females and dwarfed males

Gąsiorowski

Furu

Hejnol

2019

Preprint

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BackgroundMonogononta is a large clade of rotifers comprised of diverse morphological forms found in a wide range of ecological habitats. Most of the monogonont species display a cyclical parthenogenesis, where generations of asexually reproducing females are interspaced by mixis events when sexual reproduction occurs between mictic females and dwarfed, haploid males. The morphology of monogonont feeding females is relatively well described, however data on male anatomy are very limited. Thus far, male musculature of only two species has been described with confocal laser scanning microscopy (CLSM) and it remained unknown how dwarfism influences neuroanatomy of males.ResultsHere, we provide a CLSM-based description of the nervous system of both sexes ofEpiphanes senta, a freshwater monogonont rotifer. The general nervous system architecture is similar between males and females and shows same level of complexity. However, the nervous system in males is more compact and lacks its stomatogastric part.ConclusionComparison of the neuroanatomy between male and normal-sized feeding females provides better understanding of the nature of male dwarfism in Monogononta. We propose that dwarfism of monogonont non-feeding males is a specific case of progenesis as they, due to their inability to feed, retain a juvenile body size. Reduction of the stomatogastric nervous system in the males correlates with the loss of entire digestive tract and associated morphological structures.

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“…On the other side, for multicellular organisms we consider this approach to be still premature, although attempts on more anatomically simple organisms (e.g. Placozoa (Driscoll et al 2013), Orthonectida (Bondarenko et al 2019)), with presumably lower complexity microbiomes, could be tempting.…”

Section: Applicability Of the "Next Generation Taxonomy" To "Higher-lmentioning

confidence: 99%

Next generation taxonomy: integrating traditional species description with the holobiont concept and genomic approaches - The in-depth characterization of a novelEuplotesspecies as a case study

Serra

Gammuto

Nitla

et al. 2019

Preprint

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In 1991 Margulis defined holobionts as the assemblage of "two or more organisms, members of different species" which remain associate "throughout a significant portion of the life history". In recent times, holobionts have been described among many and far-related groups of living beings, such as plants, algae, insects, corals, and even humans. These studies have arisen an increasing interest in different contexts but, to our knowledge, the holobiont concept has not been applied in taxonomy. Here we propose a new approach to modern taxonomy, aimed to integrate the holobiont concept and genomic and bioinformatic analyses with the classical/morphological tools traditionally used in taxonomy. The inclusion of symbiont morphology, and of mitochondrial and symbiont genomes will allow the discipline to move toward what could become the "next generation taxonomy". As an example of this new paradigm in the characterization of holobionts, we herein provide the taxonomic description of the ciliate protist Euplotes vanleeuwenhoeki sp. nov. (Euplotia, Ciliophora) and its bacterial endosymbiont "Candidatus Pinguicoccus supinus" gen. nov., sp. nov. (Opitutae, Verrucomicrobia). Interestingly, we found that this endosymbiont has an extremely reduced genome (~163 Kbp), which is suggestive of a high integration with the host and represents the first case of such an extreme reduction in Verrucomicrobia, and the first case in a protist host.University of Pisa PRA_2018_63 project (to GP); the Italian Ministry of Education, University and Research (MIUR): Dipartimenti di Eccellenza Program (2018-2022) -

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Comparative analysis of the mitochondrial genomes of Orthonectida: insights into the evolution of an invertebrate parasite species

Cited by 20 publications

References 26 publications

Dicyemida and Orthonectida: Two Stories of Body Plan Simplification

Dicyemida and Orthonectida: Two Stories of Body Plan Simplification

Morphology of the nervous system of monogonont rotiferEpiphanes sentawith focus on sexual dimorphism between feeding females and dwarfed males

Next generation taxonomy: integrating traditional species description with the holobiont concept and genomic approaches - The in-depth characterization of a novelEuplotesspecies as a case study

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