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Cylindrotheca closterium

ABSTRACT: Cylindrotheca closterium overview

PROVIDER: PRJNA247698 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR959101.fastq.gz	Fastqsanger.gz
	SRR988495.fastq.gz	Fastqsanger.gz
	SRR988496.fastq.gz	Fastqsanger.gz
	SRR988497.fastq.gz	Fastqsanger.gz
	SRR988498.fastq.gz	Fastqsanger.gz

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Cylindrotheca closterium

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Cylindrotheca closterium, reference genome sequencing

Project description:Genomics data produced to generate a first reference draft of the Cylindrotheca closterium diatom species.

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Cylindrotheca closterium transcriptomic SIP- response

Project description:RNA-seq data representing the response of Cylindrotheca closterium MT+ cells to a filtrate containing the sex pheromone SIP-.

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Five diatoms transcriptomes under iron limitation and oxidative stress

Project description:Divergent functions of two clades of flavodoxin in diatoms mitigate oxidative stress and iron limitation Thalassiosira pseudonana and 4 open-ocean diatoms were subjected to iron limitation or short-term oxidative stress (hydrogen peroxide). mRNA profiles of T. pseudonana (CCMP1335), Thalassiosira oceanica (CCMP1005), Amphora coffeaeformis (CCMP1405), Chaetoceros sp. (CCMP199), and Cylindrotheca closterium (CCMP340).

2022-11-07 | GSE217467 | GEO

Pheromone Mediated Sexual Reproduction of Pennate Diatom Cylindrotheca closterium.

Project description:Benthic diatoms dominate primary production in marine subtidal and intertidal environments. Their extraordinary species diversity and ecological success is thought to be linked with their predominantly heterothallic sexual reproduction. Little is known about pheromone involvement during mating of pennate diatoms. Here we describe pheromone guided mating in the coastal raphid diatom Cylindrotheca closterium. We show that the two mating types (mt+ and mt-) have distinct functions. Similar to other benthic diatoms, mt+ cells are searching for the mt- cells to pair. To enhance mating efficiency mt- exudes an attraction pheromone which we proved by establishing a novel capillary assay. Further, two more pheromones produced by mt- promote the sexual events. One arrests the cell cycle progression of mt+ while the other induces gametogenesis of mt+. We suggest that C. closterium shares a functionally similar pheromone system with other pennate diatoms like Seminavis robusta and Pseudostaurosira trainorii which synchronize sexual events and mate attraction. Remarkably, we found no evidence of mt+ producing pheromones, which differentiates C. closterium from other pennates and suggests a less complex pheromone system in C. closterium.

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Thermal Niche Differentiation in the Benthic Diatom <i>Cylindrotheca closterium</i> (Bacillariophyceae) Complex.

Project description:Coastal waters are expected to undergo severe warming in the coming decades. Very little is known about how diatoms, the dominant primary producers in these habitats, will cope with these changes. We investigated the thermal niche of Cylindrotheca closterium, a widespread benthic marine diatom, using 24 strains collected over a wide latitudinal gradient. A multi-marker phylogeny in combination with a species delimitation approach shows that C. closterium represents a (pseudo)cryptic species complex, and this is reflected in distinct growth response patterns in terms of optimum growth temperature, maximum growth rate, and thermal niche width. Strains from the same clade displayed a similar thermal response, suggesting niche conservation between closely related strains. Due to their lower maximum growth rate and smaller thermal niche width, we expect the polar species to be particularly sensitive to warming, and, in the absence of adaptation, to be replaced with species from lower latitudes.

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Lysophosphatidylcholines and Chlorophyll-Derived Molecules from the Diatom Cylindrotheca closterium with Anti-Inflammatory Activity.

Project description:Microalgae have been shown to be excellent producers of lipids, pigments, carbohydrates, and a plethora of secondary metabolites with possible applications in the pharmacological, nutraceutical, and cosmeceutical sectors. Recently, various microalgal raw extracts have been found to have anti-inflammatory properties. In this study, we performed the fractionation of raw extracts of the diatom Cylindrotheca closterium, previously shown to have anti-inflammatory properties, obtaining five fractions. Fractions C and D were found to significantly inhibit tumor necrosis factor alpha (TNF-⍺) release in LPS-stimulated human monocyte THP-1 cells. A dereplication analysis of these two fractions allowed the identification of their main components. Our data suggest that lysophosphatidylcholines and a breakdown product of chlorophyll, pheophorbide a, were probably responsible for the observed anti-inflammatory activity. Pheophorbide a is known to have anti-inflammatory properties. We tested and confirmed the anti-inflammatory activity of 1-palmitoyl-sn-glycero-3-phosphocholine, the most abundant lysophosphatidylcholine found in fraction C. This study demonstrated the importance of proper dereplication of bioactive extracts and fractions before isolation of compounds is commenced.

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