Category: Dinoflagellate genomics

Dinoflagellates and diatoms are among the most prominent microeukaryotic plankton groups, and they have evolved different functional traits reflecting their roles within ecosystems. However, links between their metabolic processes and functional traits within different environmental contexts warrant further study. The functional biodiversity of dinoflagellates and diatoms was accessed with metatranscriptomics using Pfam protein domains as proxies for functional processes. Despite the overall…

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Knockdown of Dinoflagellate Condensin CcSMC4 Subunit Leads to S-Phase Impediment and Decompaction of Liquid Crystalline Chromosomes.
Microorganisms. 2020 Apr 14;8(4):
Authors: Yan THK, Wu Z, Kwok AC…

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Complete Genome Sequence of a Toxic and Bioactive Exopolysaccharide-Bearing Bacterium, Sulfitobacter sp. Strain AM1-D1.
Microbiol Resour Announc. 2020 Apr 16;9(16):
Authors: Yang X, Jiang ZW, Chen Z…

Sulfitobacter sp. strain AM1-D1, a toxic bacterium of the family Rhodobacteraceae, was isolated from the cultivable phycosphere microbiota of marine toxigenic dinoflagellate Alexandrium minutum amtk4. The complete 4.69-Mb genome comprises one single circular chromosome and five circular plasmids. It has 4,559 coding genes, including those for biosynthesis or degradation of saxitoxin and bioactive exopolysaccharides.

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Transcriptomic analysis of polyketide synthases in a highly ciguatoxic dinoflagellate, Gambierdiscus polynesiensis and low toxicity Gambierdiscus pacificus, from French Polynesia.
PLoS One. 2020;15(4):e0231…

Dinoflagellates have some of the largest genomes, and their liquid-crystalline chromosomes (LCCs) have high degrees of non-nucleosomal superhelicity with cation-mediated DNA condensation. It is currently unknown if condensins, pentameric protein complexes containing structural maintenance of chromosomes 2/4, commonly involved in eukaryotic chromosomes condensation in preparation for M phase, may be involved in the LCC structure. We find that CcSMC4p (dinoflagellate SMC4 homolog) level peaked at…

Marine dinoflagellates produce a diversity of polyketide toxins that are accumulated in marine food webs and are responsible for a variety of seafood poisonings. Reef-associated dinoflagellates of the genus Gambierdiscus produce toxins responsible for ciguatera poisoning (CP), which causes over 50,000 cases of illness annually worldwide. The biosynthetic machinery for dinoflagellate polyketides remains poorly understood. Recent transcriptomic and genomic sequencing projects have revealed the…

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Mesorhizobium alexandrii sp. nov., isolated from phycosphere microbiota of PSTs-producing marine dinoflagellate Alexandrium minutum amtk4.
Antonie Van Leeuwenhoek. 2020 Mar 19;:
Authors: Yang X, Jia…

An aerobic, Gram-stain-negative, motile and rod-shaped bacterial strain, designated as Z1-4^(T), was isolated from the phycosphere microbiota of marine dinoflagellate Alexandrium minutum that produces paralytic shellfish poisoning toxins. Phylogenetic analysis based on 16S rRNA gene sequences showed that the new isolate belongs to the genus Mesorhizobium, and it was closely related to Mesorhizobium waimense LMG 28228^(T) and Mesorhizobium amorphae LMG 18977^(T) with both 16S rRNA gene sequence…

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Correlation between organelle genetic variation and RNA editing in dinoflagellates associated with the coral Acropora digitifera.
Genome Biol Evol. 2020 Feb 27;:
Authors: Shoguchi E, Yoshioka Y, Shi…